Info-computational Constructivism Gordana Dodig-Crnkovic Mälardalen University, Sweden gordana.dodig-crnkovic@mdh.se Structured Abstract Context: At present we lack both common understanding of the process of cognition in living organisms and the details of construction of knowledge in embodied, embedded cognizing agents in general, including future artifactual intelligent agents such as cognitive robots and softbots that are being developed. The info-computational approach is focused on the mechanisms behind the observed phenomena understood as computational processes on informational structures. Purpose: This paper presents a study within info-computational framework of the process of knowledge production in cognizing agents. Info-computationalism builds on two basic concepts: information (as structure) and computation (as information dynamics). Results? For a human it is impossible to grasp reality at once at all levels of organization, so we analyze cognitive processes as they unfold in a layered structure of nested information network hierarchies with corresponding computational dynamics (information processes) – from molecular, to cellular, organismic and social levels. Implications: Info-computational approach is especially suitable for modelling of phenomena where network interactions are essential such as metabolism, immune system, individual and social cognition. Constructivist Content: The aim is to contribute to the constructivist project with new perspectives and to indicate how computational approaches, dominant in knowledge production today and new computational models under current development, together with new insights from research on theory of information and bioinformatics may be related to constructivism. Key Words – Computing nature, Info-computationalism, Morphological computing, Information physics, Enactivism, Evolution with Self-organization and Autopoiesis. Introduction The historical roots of info-computational constructivism can be traced back to cybernetics, which has evolved through the three periods, (Umpleby, 2002): “In the first period of the 1950s and 1960s there was a primary concern with designing control systems and with building machines to emulate human reasoning (Wiener, 1948). In the second period of the 1970s and 1980s the focus of attention was on the biology of cognition and constructivist philosophy (Maturana, 1970; von Foerster, 1981; von Glasersfeld, 1987). In recent years increasing attention has been given to social systems (Umpleby, 2001). Whereas the work on the biology of cognition required that the focus of attention shift from what is observed to the observer, the recent interest in social systems requires an emphasis on multiple observers and their beliefs (…) by considering second order cybernetics or constructivist cybernetics as a conceptual system (…).” The achievements of the first period have been largely assimilated into engineering, automation, robotics (especially autonomous robotics) and related fields, while the research into topics of the third period is under current dynamic development labelled as social cognition/ social computing/ multi agent systems, and via those developments integrated in the info - computational conceptual space. This article will concentrate on the connections of info-computationalism with the second period, with the focus on biology of cognition and constructivist philosophy with Humberto Maturana, Heinz von Foerster, and Ernst von Glasersfeld as main representatives. Based on arguments developed in my earlier work it examines how info-computationalism relates to different constructivist approaches. For the details please consult original articles. 1 The description of the conceptual framework of info-computationalism can be found in (Dodig-Crnkovic & Müller, 2011) (Dodig-Crnkovic, 2009) (Dodig-Crnkovic, 2006). The relationship between natural computing (such as biocomputing, DNA-computing, social computing, quantum computing, etc) and the traditional Turing machine model of computation is elaborated in (Dodig-Crnkovic, 2012a)(DodigCrnkovic, 2011a) (Dodig-Crnkovic, 2011b) (Dodig-Crnkovic, 2010a). Constructing/generation of knowledge within info-computational framework is discussed in (Dodig-Crnkovic, 2007) (DodigCrnkovic, 2010b)(Dodig-Crnkovic, 2010c)(Dodig-Crnkovic, 2008). The problem of the relationship between closed and open systems, that is complementarity of constructive and axiomatic approaches is addressed in (Burgin & Dodig-Crnkovic, 2013). This elucidates the problematic nature of absolute truth and shows the need for replacement of the notion of truth by the notion of correctness within a formal system and relates to the controversies about the relationship between knowledge and truth actualized by constructivists. Finally the idea of computing nature and the relationships between two basic concepts of information and computation are explored in (DodigCrnkovic & Giovagnoli, 2013) (Dodig-Crnkovic & Burgin, 2011). The Computing Nature The universe is an idea deeply rooted in our human culture, different in different places and during different epochs. At one time, it was a living organism (Tree of Life, World Turtle, Mother Earth), at yet another time, mechanical machinery - the Cartesian-Newtonian clockwork. Today’s metaphor for the universe is more and more explicitly becoming a computer or rather a network of networks of computational processes. Computer pioneer Zuse was the first to suggest (in 1967) that the physical behavior of the entire universe is being computed on a basic level, possible to model on cellular automata, by the universe itself which he referred to as “Rechnender Raum” or Computing Space/Cosmos. Consequently, Zuse was the first pancomputationalist (naturalist computationalist), followed by many others like Ed Fredkin, Stephen Wolfram and Seth Lloyd – to name but a few. According to the idea of computing nature (naturalist computationalism or pancomputationalism) one can view the time development (dynamics) of physical states in nature as information processing (natural computation). Such processes include self-assembly, developmental processes, gene regulation networks, gene assembly in unicellular organisms, proteinprotein interaction networks, biological transport networks, and similar. (Dodig-Crnkovic & Giovagnoli, 2013) Within info-computationalism, two basic concepts information and computation (the dynamics of informational structure) are mutually interdependent (Dodig-Crnkovic, 2011a) (Chaitin, 2007) – so the framework is a synthesis of informational structural realism and natural computationalism. Informational structural realism (Floridi, 2003) takes information to be the fabric of the universe (for an agent). As a consequence the process of dynamical changes of the universe makes the universe a huge computational network where computation is information processing. As it corresponds to the dynamic of processes that exist in the universe, it is necessarily both discrete and continuous, on both symbolic and sub-symbolic1 level. Information and computation are two fundamental and inseparable elements necessary for naturalizing cognition and knowledge. (Dodig-Crnkovic, 2009) Physicists Zeilinger (Zeilinger, 2005) and Vedral (Vedral, 2010) suggest the possibility of seeing information and reality as one. This is in accord with informational structural realism which says that reality is made of informational structures (Floridi, 2009)(Floridi, 2008) (Sayre, 1976) as well as with info-computational epistemology (Dodig-Crnkovic, 2009) based on informational structural realism in conjunction with natural computationalism. Reality for an agent is informational and agent-dependent (observer-dependent) and consists of structural objects, which are adjusted to the shared reality of agents community of practice. This brings together metaphysical views of Wiener (“information is information, not matter or energy”) and Wheeler (“it from bit”) with Zuse, Fredkin, Lloyd, Wolfram and others view of computing nature. In sum: information is the structure, the fabric of reality. The world exists independently from us (realist position of structural realism) in the form of proto-information, the potential form of existence 1 Sub-symbolic computations go on in neural networks, as signal processing. 2 corresponding to Kant’s das Ding an sich. That proto-information becomes information (“a difference that makes a difference” according to (Bateson, 1972)) for a cognizing agent in a process of interaction through which specific aspects of the world get uncovered. There is a more general definition that includes the fact that information is relational and subsumes Bateson’s definition: ”Information expresses the fact that a system is in a certain configuration that is correlated to the configuration of another system. Any physical system may contain information about another physical system.” (italics added) (Hewitt, 2007) This has profound consequences for epistemology and relates to the ideas of participatory universe, (Wheeler, 1990) endophysics (Rössler, 1998) and observer-dependent knowledge production as understood in second-order cybernetics. Combining Bateson and Hewitt insights, on the basic level, information is the difference in one physical system that makes difference in another physical system. Of special interest with respect to knowledge generation are agents - systems able to act on their own behalf. The world as it appears to an agent depends on the type of interaction through which the agent acquires information2. Potential information in the world is obviously much richer than what we observe, containing invisible worlds of molecules, atoms and sub-atomic phenomena, distant cosmological objects and similar. Our knowledge about this potential information or proto-information which reveals with help of scientific instruments continuously increase with the development of new devices and the new ways of interaction with the world, both theoretical and material constructs (Dodig-Crnkovic & Mueller, 2009). Information and Computation in Cognizing Agents “Intelligence organizes the world by organizing itself.” (Piaget, 1955) “Ontologically, Eigenvalues and objects, and likewise, ontogenetically, stable behavior and the manifestation of a subject’s ‘grasp’ of an object cannot be distinguished.” (Foerster, 1977) p. 280 (italics added) Studies in biology, ethology and neuroscience, which have increased our knowledge of biological cognitive functions, have led to the insight that the most important feature of cognition is its ability to deal efficiently with complexity. This, together with the increase in power of electronic computing brings us closer to adequate modelling of intelligent behaviour. From the computationalist point of view intelligence may be seen as capacity based on several levels of data processing in a cognizing agent, as argued by Minsky. Data, information, perceptual images and knowledge are organized in a multiscale model of the brain and nervous system, up to the emergent level of consciousness according to (Minsky, 1986)(Minsky, 2011). Multiresolutional models have proven to be a good way of studying complexity in biological systems, and they are also being implemented in artificial intelligence, AI (Goertzel, 1993). The advantage of computational approaches is their testability. Cognitive robotics research, e.g. presents us with a sort of laboratory where our understanding of cognition can be tested in a rigorous manner. From cognitive robotics it is becoming evident that cognition and intelligence are closely related to agency. Anticipation, planning and control are essential features of intelligent agency. A similarity has been found between the generation of behaviour in living organisms and the formation of control sequences in artificial systems. (Pfeifer & Bongard, 2006)(Pfeifer, Lungarella, & Iida, 2007) Information produced from sensory data processed by an agent is a result of perception. From the point of view of data processing, perception can be seen as an interface between the data (the world) and an agent’s perception of the world. (Hoffman, 2009) criticizes traditional view of perception as a true picture of the world. “Instead, our perceptions constitute a species-specific user interface that guides behavior in a niche. Just as the icons of a PC's interface hide the complexity of the computer, so our perceptions usefully hide the complexity of the world, and guide adaptive behavior. This interface theory of perception offers a framework, motivated by evolution, to guide research in object categorization. ” 2 For example, results of observations of the same physical object (celestial body) in different wavelengths (radio, microwave, infrared, visible, ultraviolet and X-ray) give profoundly different pictures. 3 Thus, perception cannot be cut off on one side of the interface, inside an agent and its brain. Patterns of information are both in the world and in the functions and structures of the agent. Information is the difference in the world that makes difference in an agent. With perception as an interface, sensorimotor activities play a central role in realizing this function of connecting the inside with the outside worlds of an agent, endogenous with the exogenous. Perception has co-evolved with sensorimotor skills of an organism. Enactive approach to perception (Noë, 2004) emphasizes the role of sensorimotor abilities, that can be connected with the changing informational interface between an agent and the world, and thus increasing information exchange. Both enactive approach and interface theory fit naturally into info-computational framework. As mentioned before with reference to (Minsky, 1986) and (Goertzel, 1993), the step from perception to higher cognitive processes is not trivial and detailed multiresolutional computational accounts are yet to be developed. They can be expected along the lines similar to Brier’s transdisciplinary approach of Cybersemiotics (Brier, 2013) with the difference that the connections between different branches of scientific knowledge (in the sense of “Wissenschaft”) are here construed computationally. Traditionally, symbolic AI was an attempt to model cognition and intelligence as symbol manipulation, which turned out insufficient. (Clark, 1989) In order to improve and complement symbolic approaches, Smolensky proposed mechanism of an intuitive processor (which is not accessible to symbolic intuition), with a conscious rule interpreter: “What kinds of programs are responsible for behavior that is not conscious rule application? I will refer to the virtual machine that runs these programs as the *intuitive processor*. It is presumably responsible for all of animal behavior and a huge proportion of human behavior: Perception, practiced motor behavior, fluent linguistic behavior, intuition in problem solving and game-playing--in short, practically all skilled performance.” (Smolensky, 1988) Sloman has developed interesting ideas about mind as virtual machine running on the brain in (Sloman, 2002) which also addresses the symbol grounding problem. From the point of view of info-computationalism, a mechanism behind this virtual machine hierarchy is computational self-organization of information, i.e. morphological computing, see (Dodig-Crnkovic, 2012b) and references therein. In his new research programme, Sloman goes a step further studying metamorphogenesis which is the morphogenesis of morphogenesis, (Sloman, 2013) – a way of thinking in the spirit of second order cybernetics. Info-Computationalist Epistemological Constructivism “Living systems are cognitive systems, and living as a process is a process of cognition. This statement is valid for all organisms, with or without a nervous system.” (Maturana & Varela, 1980) The above understanding of cognition is adopted by info-computationalism as it provides a notion of cognition in degrees, which provides a bridge from human-level cognition to minimal cognition in simplest biological forms and intelligent machines (under development). Within the framework of infocomputational naturalism (Dodig-Crnkovic, 2009) knowledge is seen as a result of successive structuring of data, where data are simplest information units, signals acquired by a cognizing agent through the senses/ sensors/ (Dodig-Crnkovic, 2007) (Skyrms, 2010). Information is meaningful data, which can be turned into knowledge by an interactive computational process going on in the cognizing agent. Information is always embodied in a physical substrate: signal, molecule, particle or event which will induce change of a structure or a behaviour of an agent (Landauer, 1991). The world (reality) for an agent presents potential information, both outside and within an agent. Knowledge, on the other hand, always resides in a cognitive agent. Semantics develops as data → information → knowledge structuring process, in which complex structures are self-organized by the computational processing from simpler ones. The meaning of information is thus defined for an agent and a group of agents in a network and it is given by the use information has for them. Knowledge generation as information processing in biological agents presupposes natural computation, defined by MacLennan (MacLennan, 2004) as computation occurring in nature or inspired by that in nature, which is the most general current computation paradigm. 4 Knowledge Generation as Morphological Computation Traditional theoretical Turing machine model of computing is equivalent to algorithms/effective procedures, recursive functions or formal languages. Turing machine is a logical device, a model for execution of an algorithm. However, if we want adequately to model computing nature including biological structures and processes understood as embodied physical information processing, highly interactive and networked computing models beyond Turing machines are needed, as argued in (DodigCrnkovic & Giovagnoli, 2013). In order to develop general theory of the networked physical information processing, we must also generalize the ideas of what computation is and what it might be. For new computing paradigms, see for example (Rozenberg, Bäck, & Kok, 2012)(Burgin, 2005)(MacLennan, 2004) (Wegner, 1998)(Hewitt, 2012)(Abramsky, 2008). Turing machines form the proper subset of the set of information processing devices. In the computing nature, knowledge generation should be studied as a natural process. That is the main idea of Naturalized epistemology (Harms, 2006), where the subject matter is not our concept of knowledge, but the knowledge itself as it appears in the world3 as specific informational structures of an agent. The origin of knowledge in first living agents is not well researched, as the idea still prevails that knowledge is possessed only by humans. However, there are different types of knowledge and we have good reasons to ascribe “knowledge how” and even simpler kinds of “knowledge that” to other living beings. Plants can be said to possess memory (in their bodily structures) and ability to learn (adapt, change their morphology) and can be argued to possess rudimentary forms of knowledge. On the topic of plant cognition see Garzón in (Pombo, O., Torres J.M., Symons J., 2012) p. 121. In his Anticipatory systems (Rosen, 1985) claim as well: “I cast about for possible biological instances of control of behavior through the utilization of predictive models. To my astonishment I found them everywhere[…] the tree possesses a model, which anticipates low temperature on the basis of shortening days” Popper (Popper, 1999) p. 61 ascribes the ability to know to all living: ”Obviously, in the biological and evolutionary sense in which I speak of knowledge, not only animals and men have expectations and therefore (unconscious) knowledge, but also plants; and, indeed, all organisms.” Computation as information processing should not be identified with classical cognitive science, with the related notions of input–output and structural representations – but it is important to recognize that also connectionist models are computational as they are also based on information processing (Scheutz, 2002)(Dodig-Crnkovic, 2009). The basis for the capacity to acquire knowledge is in the specific morphology of organisms that enables perception, memory and adequate information processing that can lead to production of new knowledge out of old one. Harms proved a theorem showing that natural selection will always lead a population to accumulate information, and so to 'learn' about its environment. (Okasha, 2005) points out that “any evolving population 'learns' about its environment, in Harms' sense, even if the population is composed of organisms that lack minds entirely, hence lack the ability to have representations of the external world at all. ” That may be seen not as a drawback of the theory but as strength because of the generality of naturalistic approach. It shows how cognitive capacities are a matter of degree and how they slowly and successively develop with evolution. Recent empirical results suggest that even simple 'lifeless' prion molecules are capable of evolutionary change and adaptation,(Li, Browning, Mahal, Oelschlegel, & Weissmann, 2010). However, this understanding of basic evolutionary mechanisms of accumulating information at the same time increasing information processing capacities of organisms (such as memory, anticipation, computational efficiency) is only the first step towards a full-fledged evolutionary epistemology, but the most difficult and significant one. From bio-computing we learn that in living organism biological structure (hardware) is at the same time a program (software) which controls the behaviour of that hardware. (Kampis, 1991) Self-organization and Autopoiesis. System vs. Environment: Open vs. Closed In order to understand knowledge as natural phenomenon, the process of re-construction of the origins, development and present forms and existence of life, processes of evolution and development based on 3 Maturana was the first to suggest that knowledge is a biological phenomenon. He and Varela argued that life should be understood as a process of cognition which enables an organism to adapt and survive in the changing environment. [this does not accurately refer to what Maturana & Varela argue] 5 self-organization are central. Work of (Maturana & Varela, 1980) on the constructivist understanding of life processes is of fundamental importance. They define the process of autopoiesis: “An autopoietic machine is a machine organized (defined as a unity) as a network of processes of production (transformation and destruction) of components which: (i) through their interactions and transformations continuously regenerate and realize the network of processes (relations) that produced them; and (ii) constitute it (the machine) as a concrete unity in space in which they (the components) exist by specifying the topological domain of its realization as such a network.” (Maturana & Varela, 1980) p. 78 What does it mean that an autopoetic system is organizationally closed? It means that it conserves its organization. That is a true of a momentaneous picture of the world in which organism lives (functions, operates). Obviously evolution shows that organisms change their organization through the interactions with the environment. In a sense organisms preserve their organisation, but that organisation is dynamic. Living beings constantly metabolize, communicate and exchange information with the world. We can say that there are different processes going on in an organism – on a short time scales they retain their (dynamical) organization, while exchanging information with the world. On the longer time scale they evolve and thus change their organization. Maturana and Varela’s idea of autopoetic systems, and especially the idea of life as cognition is of vital importance but it might need some reinterpretations when incorporated into the framework of infocomputationalism. Even Luhmann applying ideas of Maturana and Varela on social autopoetic systems proposes adapted the triple autopoietic model of the biological, psychic and socio-communicative systems. (Brier, 2013) In short, the information processing picture of organisms incorporates basic ideas of autopoiesis and life, from the sub-cellular to the multi-cellular level. Being cognition, life processes are different sorts of morphological computing which on evolutionary time scales affect even the organization (structures) of living beings in a sense of meta-morphogenesis. Through autopoetic processes with structural coupling (interactions with the environment) (Maturana & Varela, 1992) (Maturana & Varela, 1980) biological system changes its structures and thus the information processing patterns in a self-reflective, recursive manner. Self-organization with natural selection of organisms, responsible for nearly all information that living systems have built up in their genotypes and phenotypes, is a simple but costly method to develop knowledge capacities. Higher organisms (which are “more expensive” to evolve) have grown learning and reasoning capability as a more efficient way to accumulate knowledge. The step from “genetic learning” (typical of more primitive life forms) to acquisition of cognitive skills on higher levels of organization of the nervous system (such as found in vertebrata) will be the next step to explore in the project of naturalized epistemology. Life is cognition according to Maturana (1970) and (Maturana & Varela 1980). In the info-computational formulation, this corresponds to information processing in hierarchy of levels of organization, from molecular networks, to cells and their organisations, to organisms and their networks/societies (DodigCrnkovic, 2008). In that way, fundamental level proto-information (structural information) corresponds to the physical structure, while cognition is a process that appears as a product of evolution in complex biological systems, as argued in (Dodig-Crnkovic & Hofkirchner, 2011). “(I)f we see a living system behaving according to what we consider is adequate behavior in the circumstances in which we observe it, we claim that it knows. What we see in such circumstances, is: a) that the living system under our attention shows or exhibits a structural dynamics that flows in congruence with the structural dynamics of the medium in which we see it, and b) that it is through that dynamic structural congruence that the living system conserves its living. I claim that the process which gives rise to the operational congruence between an organism and its niche, the process that we distinguish in daily life either as learned or as instinctive knowing, is structural coupling.” (Maturana, 2002) Maturana’s structural determinism has its counterpart in the info-computational framework in a form of structural realism with determinism replaced with causality which may take a form statistical laws. Of interest for understanding of life is a system (an agent) that presents a unity for and by itself, such that can be described as constituting a whole - a property referred to as closure. 6 “In this regard, one encounters several notions of closure in the literature: autopoiesis as organizational closure (Maturana and Varela [1]), closure to efficient cause (Robert Rosen [2]), semantic closure (Howard Pattee [3]), or operational closure (Niklas Luhmann [4]). These concepts of closure play an important role in the architecture of systems theory, because they are used to 1. define the system (in distinction to its environment) and to 2. explain the autonomy of the system “ (Bertschinger, Olbrich, Ay, & Jost, 2006) In terms of Foerster’s notion of eigenvalues (stable structures) and eigenbehaviours (stable behaviours established in the interaction with the environment): “Any system, cognitive or biological, which is able to relate internally, self-organized, stable structures (eigenvalues) to constant aspects of its own interaction with an environment can be said to observe eigenbehavior. Such systems are defined as organizationally closed because their stable internal states can only be defined in terms of the overall dynamic structure that supports them. Organizationally closed systems are also informationally open [Pask, 1992], since they have the ability to classify their constructed environment in what might be referred to as emergent representation” (Rocha, 1998) The consequence is the following, for a cognizing agent: “This reiterated the constructivist position that observables do not refer directly to real world objects, but are instead the result of an infinite cascade of cognitive and sensory-motor operations in some environment/subject coupling. Eigenvalues are self-defining, or self-referent, through the imbedding dynamics – implying a complementary relationship (circularity, closure) between eigenvalues and cognitive/sensory-motor operators: one implies, or defines, the other. "Eigenvalues represent the externally observable manifestations of the (introspectively accessible) cognitive [operations]". italics added” (Foerster, 1977) p. 278 This view has got support in the theory of complex dynamical systems such as (Juarrero, 1999, 2000, 2002) and (Kaneko & Tsuda, 2001). In cognizing agents, the constructive approach to cognition raises questions about the relationship between the models (world for an agent) and “reality” (world “as it is”). In words by Kaneko and Tsuda: “The key question that arises in this ‘constructive’ approach lies in the relationship between the virtual world (the model) and reality. The virtual world should not just be an imitation of reality, but a sort of abstraction from reality, and be constructed from our side by utilizing some abstracted essential features of reality. Understanding the relationship between the virtual world and reality is a fundamental issue in the study of complex systems with a constructive approach.” (Kaneko & Tsuda, 2001) (Brier, 2013) quotes Peirce (CP 8.191) who writes on internal vs. external and real vs. virtual: ”Thus, for example, the real becomes that which is such as it is regardless of what you or I or any of our folks may think it to be. The external becomes that element which is such as it is regardless of what somebody thinks, feels, or does, whether about that external object or about anything else. Accordingly, the external is necessarily real, while the real may or may not be external; nor is anything absolutely external nor absolutely devoid of externality.” (italics added) Reality as Simulation We humans have an impression that we interact directly with the “real world as it is”. However that is far from accurate characterization of what is going on, as already mentioned in connection to perception as interface. “Of all information processing going on in our bodies, perception is only a tiny fraction. Our perception of the world depends on the relative slowness of conscious perception. Time longer than one second is needed to synthesize conscious experience. At time scales shorter than one second, the fragmentary nature of perception reveals. The brain creates a picture of reality that we experience as (and mistake for) 'the actual thing' ” (Ballard, 2002) Already Kant argued that “phenomena” or things as they appear and which constitute the world of common experience are an illusion. Kaneko and Tsuda explain why: “ (T)he brain does not directly map the external world. From this proposition follows the notion of “interpreting brain”, i.e. the notion that the brain must interpret symbols generated by itself even at the 7 lowest level of information processing. It seems that many problems related to information processing and meaning in the brain are rooted in the problems of the mechanisms of symbol generation and meaning.” (Kaneko & Tsuda, 2001) Consciousness provides only a rough sense of what is going on in and around us, in the first place what we take to be essential for us. The world as it appears for our consciousness is a sketchy simulation which is a computational construction. The Belief that we ever can experience the world 'directly as it is' is an illusion (Nørretranders, 1999). What would that mean anyway to experience the world 'directly as it is', without ourselves being part of the process? Who would experience that world without us? It is important to understand that, as (Kaneko & Tsuda, 2001) emphasize, the brain maps the information about the (part of the) world into itself, but the mapped information is always formed by the activity of the brain itself. This seems to be the view of (Maturana, 2007) as well. The positivist optimism about observations independent of the observer proved problematic in many fields of physics such as quantum mechanics (wave function collapse after interaction), relativity (speed dependent length contraction and time dilatation) and chaos (a minor perturbation caused by measurement sufficient to switch the system to a different attractor). In general, observer and the systems observed are related and by understanding their relationship we can gain insights into limitations and power of models and simulations as knowledge generators. (Foerster, 2003) If what we perceive of the world is a simulation our brain plays for us in order to manage complexity and enable us to act efficiently, then our knowledge of the world must also be mediated by this computational modelling nature of cognition. Not even the most reliable knowledge about the physical world as it appears in sciences is independent of the modelling frameworks which indirectly impact what can be known. Models are always simplifications made for a purpose and they ignore aspects of the system which are irrelevant to that purpose. The properties of a system itself must be clearly distinguished from the properties of its models. All our knowledge is mediated by models. We often get so familiar with a model and its functions that we frequently act as if the model was the actual reality itself (Heylighen & Joslyn, 2001). Awareness of the modelling character of knowledge and the active role of the cognizing agent in the process of generation of knowledge is specifically addressed by second-order cybernetics. Cybernetic epistemology is constructivist in recognizing that knowledge cannot be passively transferred from the environment, but must be actively constructed by the cognizing agent based on the elements found in the environment in combination with information stored in the agent. The interaction with the environment eliminates inadequate models. Model construction thus proceeds through variation and selection. This agrees with Glasersfeld’s two basic principles of constructivism (Glasersfeld, 1995): “Knowledge is not passively received either through the senses or by way of communication, but is actively built up by the cognizing subject. The function of cognition is adaptive and serves the subject's organization of the experiential world, not the discovery of an ‘objective ontological reality’ ”. This understanding coincides with the info-computational view of knowledge generation (DodigCrnkovic, 2007)(Dodig-Crnkovic & Müller, 2011). Some Criticisms of Computationalism and Replies Add a subheading such as “1. No information without humans?” A typical criticism of the informational nature of reality originates from the belief that the world without cognizing agents would lose its contents because there would be no one to observe it: “So what’s the problem with saying that everything comes down to information, bits, answers to our queries? (…) The concept of information makes no sense in the absence of something to be informed—that is, a conscious observer capable of choice, or free will (…). If all the humans in the world vanished tomorrow, all the information would vanish, too.” (Horgan, 2011) 8 Let me try to reply to the above criticism. First of all, not only is information physical (Landauer, 1996), but even the opposite holds as well: “things physical are reducible to information”, quantum physics can be formulated in terms of information, for details of the argument see Goyal (Goyal, 2012) and Chiribella (Chiribella, G.; D’Ariano, G.M.; Perinotti, 2012). Secondly, clearly, if there are no cognizing agents in the world, the world as potential information, das Ding an sich, never turns into actual information for an agent. But given the fact that there are cognitive agents – not only humans but also other living beings and even machines capable of cognitive computing - processing of information and making sense of it, reality for all those agents (and not only humans) is fabric of informational relationships. It is not necessary for an agent to be conscious in order to make use of the world as potential information. Maturana and Varela view life in itself as a cognitive process (Maturana & Varela, 1992). Metabolism is aspect of cognition along with sensorimotor functions and immune system processes. No free will is needed for information processing that goes on in all living cells. Those processes can be understood as computational in the sense of natural computation, even though those single-cellular agents cannot be ascribed consciousness. Matsuno and Salthe go one step further (Matsuno & Salthe, 2011), attributing material agency and information processing ability even to such simple systems as molecules. When no agents are present to process protoinformation of the world, it remains potential. Epistemology of info-computationalism is constructive informational realism, and it describes the ways cognizing agents process information and generate knowledge from the existing world which steadily changes and evolves through processes of natural computation. Add subheading such as “2. Signals rather than information?” (Brier, 2013) criticizes the idea of information as used in info-computationalist framework: “This is the problem that pan-computational and pan-informational theories attempt to solve with a view of the world as a grand computer and a new concept of natural computing (Dodig-Crnkovic, 2010; DodigCrnkovic & Müller, 2011). Given these assumptions the view of natural computing can be expressed in this way: 1. The physical world is a network of computational processes with many levels of organization. 2. Whatever changes there are in the states of the physical world, we understand them as computation. 3. Not all kinds of computations (changes in the physical world) are best represented by the Turing model. In my view, it is not information that is transmitted through the channel in Shannon’s theory, but signals.” As an answer this criticism I refer to the work of Skyrms (Skyrms, 2010) and Bateson (Bateson, 1972). It is possible that we should see Bateson’s “differences that make a difference” as data or signals: “Kant argued long ago that this piece of chalk contains a million potential facts (Tatsachen) but that only a very few of these become truly facts by affecting the behavior of entities capable of responding to facts. For Kant’s Tatsachen, I would substitute differences and point out that the number of potential differences in this chalk is infinite but that very few of them become effective differences (i.e., items of information) in the mental process of any larger entity. Information consist of differences that make a difference.” (110a, italics mine) (Bateson, 1979) But those differences or “items of information” become instantaneously information as soon as they enter a cognitive system as they get integrated into its informational networks. Brier continues his critical view of natural computationalism: “We must further theorize how the processes of cognition and communication develop beyond their basis in the perturbation of and between closed systems and into a theory of feeling, awareness, qualia and meaning. (…) This ontological foundation does not solve the problem of how experience and meaningful cognition and communication emerge or manifest themselves in the world. This viewpoint leads us towards Peirce’s semiotics as a better foundation than a pan-computation paradigm to help us place experiential consciousness in a scientific worldview. ” 9 The above criticism may be applicable to some computational approaches but definitely not to infocomputationalism based on natural computing and the idea of the world as (proto) informational structure. As Chalmers aptly remarks: “Wheeler (1990) has suggested that information is fundamental to the physics of the universe. According to this 'it from bit' doctrine, the laws of physics can be cast in terms of information, postulating different states that give rise to different effects without actually saying what those states are. It is only their position in an information space that counts. If so, then information is a natural candidate to also play a role in a fundamental theory of consciousness. We are led to a conception of the world on which information is truly fundamental, and on which it has two basic aspects, corresponding to the physical and the phenomenal features of the world.” (italics mine) (Chalmers, 1995) The phenomenal aspect of information (vs. physical aspect) can be interpreted as a version of the endogenous vs. exogenous aspect which get its natural formulation if we chose a relational definition of information proposed in the introduction, obtained as a combination of Bateson and Hewitt definitions: on the basic level, information is the difference in one physical system that makes difference in another physical system. Phenomenal features show when this relation becomes reflexive. Info-computationalism is agent-based (observer dependent) and takes into account context dependence of open systems. Add subheading such as “3. Third-person approach?” (Brier, 2013) appraises Dennett’s approach as follows: ”Yet, Daniel Dennett (1987a, p. 5), in his introduction to The Intentional Stance, states: “I declare my starting point to be the objective, materialistic, third-person world of the physical sciences.” He attempts to eliminate subjective consciousness and the qualia of consciousness in his Consciousness Explained (Dennett 1991). He then attempts to explain ‘subjective’ phenomena in ‘objective’ terms. As far as I can see, none of these endeavours are feasible, since the language of physics does not include the notion of agent (agency) and meaning.” The way of reading the above guided by the principle of charity would be to equal objective with intersubjective and material to physical which makes Dennett’s research programme agree with modern cognitive science approaches as for example presented in (Clark, 1989). Physics has no notion of meaning, but meaning emerges from physical substrate. Music for a human is more than notes written down on paper and more than physical phenomena of energy transfer between different media. Yet those are all different facets/aspects/dimensions of music. Yet another is social – how music is learned, performed, organized in practice. Subjective experience is yet another such aspect of the phenomenon that we call music. It has no special privileged position in relation to other aspects. Subjective experience has its own merits but it is by no means more valuable than our third-person understanding of that experience. Without the third person we would not be able to share the knowledge about the existence of other first person experiences. To base a research programme on a third person perspective, intersubjective knowledge and physical foundations is the most natural approach for a scientist. No philosophical approach or scientific field can exhaust all the aspects of one phenomenon – that is why we need transdisciplinarity and collaboration as a constructive project. Constructive because it keeps the elements used in the building of a common knowledge network in which elements connected gain new meaning from their new common context. Info-computational framework needs to fill many explanatory gaps and based on neuroscience, biology, bioinformatics, biosemiotics, cognitive computing etc. provide computational models of phenomena of mind that we still lack proper scientific models for. (Clark, 1989) and (Dodig-Crnkovic & Giovagnoli, 2013) give some hints how to fill those gaps within computational framework, but it also indicates that a lot of work remains to be done. As every model serves certain purpose it is to be expected that some models may be better than the others within different domains, on different levels of abstraction and for different purposes. Conclusions The fundamental second order cybernetics legacy consists of Maturana’s finding that knowledge is a biological phenomenon, von Foerster’s insight that cognitive agents construct reality in the interplay with 10 the environment and Glaserfeld’s argument that the most important characteristics of knowledge is its viability – practicability in the world. (Umpleby, 1997) The info-computational framework as a conceptual system builds on the results of Maturana, Foerster and Glaserfeld and proposes morphological computation as information processing (computational) mechanism for knowledge generation understood as information self-structuring in cognizing agents – both biological and artificial. From current insights in the mechanisms of cognition (Smolensky & Legendre, 2006)(Clark, 1989) (Rosen, 1991)(Wiener, 1948)(Foerster, 1960)(Kampis, 1991)(Kauffman, 1993) it is becoming increasingly visible how cognizing agents construct their knowledge from information both reflexively within their own informational structures (memory, embodiment) and from the interactions with the environment (embeddedness). Knowledge provides evolutionary advantage for an agent and it is in the first place a tool of modelling of the world, thus as any model it is constructed for a purpose and can by no means be agent-independent or absolute (Dodig-Crnkovic, 2008)(Bates, 2005). Reality is a dynamical informational structure and for an agent it presents a simulation which is an interface between an inner and an outer world, resulting from both past, anticipated and current information used in producing relevant informational interface. The present article addresses number of questions that have been posed on computational approaches to constructivism. The goal is to contribute with info - computationalist realist version of constructivism. The questions have been addressed as follows. 1. Computational Constructive Realism. Reality as Simulation Glasersfeld’s claim “[The world] is a black box with which we can deal remarkably well” with computational interpretation can be unpacked into several claims. The black box of the world is protoinformation, which presents potential information for an agent capable of processing it for its own purposes. Sort of computation that “takes place in the cognizing subject that gives rise to her reality construction based on her (its4) experiences” is natural computation, as defined in the concept of Computing Nature (Dodig-Crnkovic & Giovagnoli, 2013). The knowledge construction processes in different kinds of agents, biological and artificial are formulated computationally in (Clark, 1989)(Pombo, O., Torres J.M., Symons J., 2012)(Scheutz, 2002)(DodigCrnkovic & Giovagnoli, 2013). Even though existing computational models may provide useful heuristics for simulating an individual’s construction of reality, we hope to learn more about how nature computes in order to get more detailed computational models (Dodig-Crnkovic & Giovagnoli, 2013). However, reality construction in complex cognizing agents like majority of biological systems is not possible to computationally predict, as infocomputational models, though causal, are not deterministic. Nevertheless, it might be possible to reconstruct and computationally predict reality construction in simple agents such as robots or viruses in controlled environments. 2. Information: Observer-dependence of knowledge production In words of Foerster, observer-dependence (agent-dependence) is described as “the truism that a description (of the universe) implies one who describes it (observes it)”, which implies taht: “(O)ne had to account for an “observer” (that is at least for one subject): (i) Observations are not absolute but relative to an observer’s point of view (i.e., his coordinate system: Einstein); (ii) Observations affect the observed so as to obliterate the observer’s hope for prediction (i.e., his uncertainty is absolute: Heisenberg). (…) What we need now is the description of the “describer” or, in other words, we need a theory of the observer.” p.258 (Foerster, 1981) 4 in case of simpler organisms, machines or software agents, my addition. 11 Even though there are attempts to define the observer, especially in the theory of measurement in quantum mechanics, the common understanding of the central importance of agents (“observer dependence”) in knowledge production is still missing. 3. Computation: Natural/morphological computing Present article even offer answers to the following questions: “How to define ´computational´?” (As information processing) and “Can computational models ever create something new?” (Yes, e.g. evolution shows how new species evolve in case of natural computing) Info-computational framework enables unified understanding of knowledge generation in cognizing agents, from the simplest living forms to the most complex ones, building on two basic concepts: information (structure) and computation (process). 4. Self-organization and Autopoiesis. System vs. Environment: Open vs. Closed This article argues that computational autopoiesis is not only possible, but that autopoiesis is fundamentally an info-computational process based on morphological computing. Information is defined as the difference in one physical system that makes difference in another physical system. As natural computing is physical computing, enactivism comes as a direct consequence of infocomputationalism. As in a short article like this all the arguments cannot be presented in detail, I refer interested reader to original articles and books (Dodig-Crnkovic & Burgin, 2011) and (Dodig-Crnkovic & Giovagnoli, 2013) and references therein all of which support the claim that info-computationalism is a way to “to set ´computational constructivism’ in motion”. To conclude: Info-computationalism is not a final theory of everything, but a tool for investigations, and it should be judged by its fruitfulness in producing new knowledge. (Dodig-Crnkovic & Mueller, 2009) Given the profoundness and fertility of constructivist ideas developed by second-order cyberneticians, a remarkable thing is how long time it takes for this new understanding of knowledge production including sciences to find its way into commonly shared intuitions. 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Her research interests include: computing paradigms, natural computing, social computing and social cognition, info-computational models, foundations of information, computational knowledge generation, computational aspects of intelligence and cognition, theory of science/philosophy of science, computing and philosophy and ethics (ethics of computing, information ethics, roboethics and engineering ethics). She is a co-organizer, PC member and invited speaker at numerous conferences. The most recent events she co- organized are symposia Natural/Unconventional Computing and its Philosophical Significance (co-organized with Raffaela Giovagnoli) and Social Computing - Social Cognition - Social Networks and Multiagent Systems (co-organized with Judith Simon) at AISB/IACAP World Congress 2012. She is the author of more than eighty international journal and conference publications. Her teaching includes Research Methods, Theory of Computation, Philosophy of Computing and Professional Ethics. List of at least five potential independent reviewers 1. 2. 3. 4. 5. Sören Brier, sb.ibc@cbs.dk Bob Logan, logan@physics.utoronto.ca Ranulph Glanville, ranulph@glanville.co.uk Lorenzo Magnani, lmagnani@unipv.it Stuart Umpleby, umpleby@gwu.edu 15