DOMAIN 1: INTRODUCTION TO PSYCHOLOGY Objective 1.1 Define psychology. Key Terms Psychology: the scientific study of the mind and behavior. Psychologists use the scientific method to acquire knowledge. Levels of explanation: o Lower levels: tied to biological influences (chemicals in the brain) o Middle levels: interpersonal, abilities and characteristics of individuals (depending on situation of each person) o Highest levels: social groups, organizations, cultures (sex, race, etc.) Exercises 1. Put a check mark by each statement that is true regarding psychology. __o__ Psychologists study human behavior. __o__ Psychologists study animal behavior. __o__ Psychologists study emotions and mental processes. _____ Psychology and "common sense" lead to the same conclusions about behavior and mental processes. _____ Psychology is not a science. 1 Objective 1.2 Define the scientific method and explain how it is used in psychology. Key Terms Scientific method: set of assumptions, rules, and procedures that scientists use to conduct empirical research. Scientific method demands procedure to be objective (free from personal bias or emotions of the scientist). Type of psychologists and how they use the scientific method: o Research psychologists: use scientific methods to create new knowledge about causes of behaviors o Practitioners: use existing research to help solve problems o Academic psychologists: use research findings as evidence to support theoretical concept Data: information gathered through observation or measurement. Hypothesis: tentative explanation of how or why something happens. An if-then statement is a hypothesis. o Conceptual variables: abstract ideas o Measured variables: numbers that represent conceptual variables. Theory: integrated set of principles that explains and predicts many observed relationships within a given domain of inquiry Exercises 1. What is the main purpose of the scientific method? Psychologists use the scientific method to acquire knowledge by providing a framework for developing, organizing, and sharing information. Since the research is designed to be repeated or appended to, it results in the refinement of the scientific knowledge. 2 2. The steps of the scientific method are (1) identify a problem or research question, (2) design a study, (3) collect data, (4) analyze data, (5) draw conclusions, and (6) communicate findings. Identify the step associated with each of the following activities: __3__ Dr. Lopez noted "absent" or "present" by each student's name on his class roll at each class meeting. He recorded students' exam scores on his roll sheet as well. __1__ Dr. Lopez hypothesized that students who consistently attend class get higher grades than those who are absent more often. __6__ Dr. Lopez published the results of his study in the Journal of Community College Teaching. __4__ Dr. Lopez calculated the correlation between his students' rates of absence and their exam scores and found that the two variables were positively associated. __2__ Dr. Lopez planned to track students' attendance and exam scores and to correlate these two variables at the end of the semester. __5__ Dr. Lopez inferred that the data he collected supported his hypothesis regarding the relationship between attendance and exam scores. 3 Objective 1.3 Describe the major schools of thought and theoretical perspectives in psychology. Key Terms behaviorism cognitive psychology psychoanalysis evolutionary psychology humanistic psychology biological psychology Exercises 1. Fill in the chart below. 4 sociocultural approach School of Important Theorist(s) Main Ideas John B. Watson, B.F. Based on the premise that it’s not possible to Skinner objectively study the mind, and the focus Thought Behaviorism should shift to the behaviors themselves. Heavily relied on stimuli and response concept. Psychoanalysis Sigmund Freud, Also known as psychodynamic psychology, an Alfred Adler, Carl approach to understanding human behavior Jung, Karen Horney, that focuses on the role of unconscious Erik Erikson thoughts, feelings, and memories. Theorists believe that forgotten events are the drive to current human behaviors. These events are to be explored through psychoanalysis (talk therapy, dream analysis) Humanistic Abraham Maslow Embraces the concepts of self-esteem, selfactualization, and free will. More focused on psychology self-concept as opposed to outside influence, and the innate good within all humans. Cognitive Hermann Ebbinghaus, Focused on mental processes like perception, psychology Sir Frederic Bartlett, thinking, memory, and judgement. A Jean Piaget, Donald E. counterpart to behaviorism. Broadbent, Daniel Information-processing theory: Kahneman, George Associates the brain to a computer. Miller, Eleanor Rosch, Human mind would receive input, Amos Tversky process, then produce output based on the processing result. 5 School of Important Theorist(s) Main Ideas William James Evolved from functionalism, evolutionary Thought Evolutionary psychology psychology is a brand of psychology that applies the Darwinian theory of natural selection to human and animal behavior. Evolutionary psychologists use evolutionary theory to explain romantic attractions, stereotypes, prejudice, and causes of some psychological disorders. Fitness is a key component. Advantage of one in passing on the characteristic to later generations. Limitations: Difficult to test some theories Data we have gathered might be observed and not fact Biological Focuses on the interaction between biology psychology and emotions, thoughts, and behaviors; taking in consideration the role of the brain, nervous system, hormones, chemicals, nutrition, and exercise. Sociocultural Study of how social situation and cultures can approach influence human behaviors and thinking. Follow the concept of conformity – that our behavior is dependent on others around us. Social norms – way of thinking/feeling that is deemed appropriate by a group (customs, traditions, etc.) 6 Objective 1.4 Define positive psychology and explain how it differs from other perspectives. Key Terms positive psychology Exercises 7 Objective 1.5 Define and explain the differences among the various descriptive research methods. Key Terms Types of research designs: o Descriptive research: provide snapshot of the current state of affairs o Correlational research: find the relationships between variables to help future hypotheses o Experimental research: find the impact of experimental manipulation on dependent variable. Provide definitive conclusions from correlational research. Variables in research designs: o Predictor variable o Outcome variable o Common-causal variable: variable that is not part of research hypothesis but causes both predictor and outcome, thus producing a relationship between them Exercises 1. Fill in the chart below. 8 Method Uses Limitations Naturalistic Descriptive research Limited to static observation Observe and record behavior that occurs in pictures everyday settings May not apply to other individuals in Laboratory Descriptive research other situations observation Conducted in setting created by researcher Does not explain Allows researcher to control more aspects of why things happen or behave a certain way the experiment Does not give insight on long term Case study Descriptive research effects Records of one or more individual’s experience and behavior Works under the concept of individual observations leads to understanding of human nature Provide detailed information about a single person or small group of people Survey Descriptive research Interview or questionnaire to get a picture of the beliefs or behaviors of a sample of people of interest Capture the thoughts or reported behaviors of a large population of people Correlation Systematic relationship No conclusion Involves measurement of two or more about cause and effect variables and the relationship between them can be drawn Can be used in place of experimental research if a variable cannot be manipulated 9 Method Uses Limitations Correlation Value ranges from -1.00 to +1.00 Coefficient Positive correlations mean variables both increase or decrease Negative correlations mean variables move in opposite direction Zero correlation indicates no relationship 2. Classify each of the following as an example of (a) naturalistic observation, (b) laboratory observation, (c) case study, (d) survey, or (e) correlation. a. A professor compared his students' attendance rates to their grades. She found that students with fewer absences tended to get higher grades. (e) b. Psychologists studying aggression in early childhood found that an average of four instances of hitting or pushing occurred during each hour that they spent watching a group of two-yearold’s interact in a day-care classroom. (a) c. A telephone poll found that 37% of respondents had a favorable opinion of "Sparkle" toothpaste. (d) d. A hidden camera recorded the behavior of male and female research participants who were asked to wait for a long period of time in a room in which a researcher had placed a stack of pornographic magazines. (b) e. A psychologist who was interested in job satisfaction gathered in-depth, detailed information about organizations whose workers reported being highly satisfied with their jobs. (c) 3. Why does correlation fail to prove causation? It is not possible to measure every variable that could cause the predictor and outcome variables, there will always be the possible existence of common-causal variables and reverse causation 10 Objective 1.6 Define representative sample and explain why it is important. Key Terms Sample: people chosen to participate in the research Population: everyone that researcher wishes to know about Representative sample: representation of the population within a sample. Representative sample must take into consideration the diversity of the population to produce a more accurate result Exercises 1. Barry reached into his bag of M&Ms and pulled out three pieces of candy, each of which was red. All of the M&Ms in Barry's bag are the (sample/population) of M&Ms. The three that he took out are the (sample/population). 2. Each bag of M&Ms has candies of several colors. Thus, the three red M&Ms that Barry took out of his bag (are/are not) a representative sample. 3. Why are researchers concerned about the representativeness of the samples in their studies? a. They don't want to offend anyone. b. They hope to generalize the findings of their studies to populations of interest. c. Representative samples are usually large enough to ensure statistical significance. d. Scientific journals will not publish a study unless the sample is representative. 11 Objective 1.7 Describe the experimental method, state its advantages and disadvantages, and distinguish between independent and dependent variables. Key Terms Experimental research: find the impact of experimental manipulation on dependent variable. Provide definitive conclusions from correlational research o Types of variable in experimental research: Dependent variable: measured variable that is expected to be influenced by the experimental manipulation Independent variable: causing variable that is created or manipulated by the experimenter Causal hypothesis: hypothesis that specify a relationship between two variables in which changes in one variable cause changes in the other Experimental group: receives some amount of the independent variable Control group: comparison group, receives a different amount of the independent variable than the experiment group, often zero Random assignment: most common method of creating equivalence among the experimental conditions. Participants are assigned to a group through a random process. This is to make sure the groups are equivalent on average on all possible variables. Exercises 1. What is the primary advantage of the experimental method? It allows the drawing of conclusions about the causal relationships among variables. 2. Read the scenario and answer the questions that follow it. 12 In a laboratory study of sleep deprivation, researchers employed a variety of techniques to keep volunteers awake for variable amounts of time. One group of participants was kept awake for 24 hours, and the other was kept awake for 48 hours. During periods of forced wakefulness, participants were required to engage verbal learning tasks such as memorizing the definitions of obscure English words. At the conclusion of the period of forced wakefulness, participants were allowed to sleep for as long as they wanted to. When participants awakened, researchers tested them on the learning tasks they completed during the periods of forced wakefulness. The researchers discovered that participants who were deprived of sleep for 48 hours recalled less than those who had been forced to remain awake for 24 hours. 1a. What is the independent variable? Time participant was forced to stay awake 1b. What is the dependent variable? How well participants were able to recall the words 1c. What is the control group? The group who was kept awake for 48 hours 1d. What is/are the experimental group(s)? The group who was kept awake for 24 hours 3. Why is random assignment critical to the experimental method? To make sure the groups on average are equivalent, eliminating the influence of common-causal variables 13 Objective 1.8 Explain the rationale behind placebo-controlled experiments. Key Terms Placebo: a treatment that has no effect on the dependent variable Placebo effect: when the control group participants are found to have responded to the placebo. It results in a change in the outcome that’s due to the participant’s expectations rather than to the effectiveness of a treatment. Experimenter bias: experimenter subtly treats the research participants in the various experimental conditions differently, resulting in an invalid confirmation of the research hypothesis. A threat to the validity of a research experiment. This can be avoided if the experimenter is blind to condition, meaning that they don’t know which conditions the participants are assigned to. Double-blind technique: a variation of the condition blindness where both researchers and participants are unaware of which subjects are receiving the active treatment. Statistical significance: the confidence with which a scientist can conclude that data are not due to chance or random error. Exercises 1. Why do researchers use placebos and double-blind designs? To ensure there is no experimental bias thus proving the validity of the experiment. 2. Read the scenario and answer the questions. Sam's psychology professor, Dr. Smith, recruited him to serve as a research assistant. Sam's job was to teach study participants a new strategy for studying textbook material. Experimental group participants were supposed to be taught the new strategy, while control group 14 participants were to be told that they could increase their test scores by holding their textbooks at a particular angle when reading. Each group was allowed to practice the techniques they were taught on a chapter in a psychology textbook, after which Sam tested them over what they had studied. Dr. Smith was surprised to discover that the control group scored higher on the tests than the experimental group did. (A) Did Dr. Smith's design include a placebo? Yes (B) If so, what was the placebo? Holding the textbook at a particular angle when reading (C) What term refers to the outcome of Dr. Smith's study? The placebo effects (D) Would it be correct to conclude that the procedure that was taught to the control group is a useful study strategy? If not, what is the correct conclusion? No. Sam’s experiment suffered experimenter bias because Sam knows which group received the placebo and therefore is not blind to condition. Sam also told the control group of the effectiveness of the placebo which leads to the placebo effect. 15 Objective 1.9 Outline the ethical standards that psychological researchers must follow. Key Terms Ethical codes: o Legality: research doesn’t violate any law o Institutional approval: colleges or organizations need to have an institutional review board to make sure of the ethics of a research o Informed consent: participants must be made aware of risks or purpose of a research o Deception: participants must be debriefed at the end of a research o Participants under another’s authority: those who participated through a third party must be free do join or leave research at any time. Those who opted out of the research must be treated equally o Payment for participation: participants should be compensated for their time o Confidentiality: ensuring participants’ privacy o Publication: results of research should be made publicly available o Animal welfare: must protect animal from excessive discomforted and animals should be cared for by trained professional Exercises Read the following statements and place a checkmark beside those that violate the APA code of ethical conduct in animal or human research. 1. _____ A researcher has been approved to collect data at a shopping mall. 2. __o__ During new student orientation, a researcher appears before an assembly of orientation participants and asks them to complete a survey of racial attitudes. Some students receive a survey with a cover page that states that they must write their names on the survey so that their responses 16 can be sent to the university counseling center to determine whether they are in need of cultural sensitivity training. The cover page on the other students' surveys state that their responses are anonymous. After collecting the surveys, the researcher discloses that the study was about the effects of anonymity on survey responses and that none of the students' responses will actually be sent to the counseling center. 3. __o__ An elementary school principal conducted a study of reading skills at her school in order to complete her doctoral dissertation. Since she was the school's chief administrator, she assumed that she did not need to get students' or parents' permission to carry out the study. 4. __o__ A researcher did a study in which intelligence tests were administered to all participants. She refused to allow participants access to their test results because she feared that they might be upset by them. 5. __o__ A researcher sacrificed his subjects (rats) by depriving them of food them at the end of the study so that he could obtain additional data on how long a rat can live without food. 17 DOMAIN 2: BIOLOGY AND BEHAVIOR Objective 2.1 Describe the various methods for studying the brain and its functions. Key Term Electroencephalograph (EEG): less invasive of the lesions approaches, EEG is a technique that records the electrical activity produced by the brain’s neurons through the use of electrodes that are placed around the research participant’s head. It can track brain waves when the subject engages in different activities. Advantage: subject can move around and researchers can observe changes over fast time periods. Disadvantage: does not provide a clear image of the structure of the brain. Computerized axial tomography (CAT or CT scan): uses X-ray tube to encircle the head and produce cross sectional series of X-rays which are then combined to get a 3D image of brain structures. Only produce static image. Magnetic resonance imaging (MRI): magnetic fields used to differentiate between types of tissue in the brain. Less dangerous than CT scan as it does not expose patients to X-ray. Only produce static image. Positron emission tomography (PET scan): monitors decay of a radioactive isotope injected into the patient. Often combined with CT scans or MRIs to allow radiologists to see how the brain is functioning. Functional magnetic resonance imaging (fMRI): type of brain scan that uses magnetic field to create images of brain activity in each brain area. Detects the amount of blood flow in each brain region to project neural activity. Can produce clear, detailed pictures of brain structures. Noninvasive. Most commonly used method of learning about brain structure. Exercises 18 1. Write the name of each technique in the blank beside its description A. Electroencephalography (EEG) produces a record of electrical activity in the brain B. Positron Emission Tomography (PET) produces images of brain structure and function C. Magnetic resonance imaging (MRI) produces images of metabolic activity in the brain D. Computerized Axial Tomography (CT scan) uses X-rays to produce images of brain structures E. Functional magnetic resonance imaging (fMRI) uses magnetic impulses to produce images of brain structures 19 Objective 2.2 Identify the basic components of the neuron. Key Terms Neuron: a cell in the nervous system whose function it is to receive and transmit information. Made up of three parts: cell body, dendrites, and axon. Dendrites: collects information from other cells and sends the information to the soma. Axon: segmented fiber that transmits information away from the cell body toward the other neurons or to the muscles and glands. Cell body: also known as soma. Contains the nucleus of the cell and keeps the cell alive. Myelin Sheath: layer of fatty tissue surrounding the axon of a neuron that both acts as an insulator and allows faster transmission of the electrical signal. Exercises 1. What is a neuron? A cell in the nervous system that receives and sends information 2. Label each part of the neuron. 20 1. soma 2. dendrites 3. myelin sheath 4. terminal buttons 21 Objective 2.3 Identify the basic components of the synapse. Key Terms Synapse: space between neurons that serve as the means through which neurons connect and disconnect through an electrochemical process. Synaptic gap: space between neurons Presynaptic neuron: sending neuron Postsynaptic neuron: receiving neuron Exercises 1. Which statement about the synapse is false? a. The synapse is the place where the dendrites of one neuron link up with the axon of another. b. One neuron can form synapses with many others. c. Synapses are filled with fluid. d. Communication between neurons takes place at the synapse. 22 Objective 2.4 Define action potential and explain the processes that occur when a neuron is activated. Key Terms Action potential: change in electrical charge that occurs in a neuron when a nerve impulse is transmitted. Resting potential: state in which the interior of the neuron contains a greater number of negatively charged ions than does the area outside the cell. Exercises 1. Number the events in the action potential in the order in which they occur. __4__ Positively charged ions flow out of the neuron. __2__ Positively charged ions flow into the neuron. __3__ The cell membrane potential is positive. __1__ The cell membrane potential is negative. 2. What is the "all or none" law? Either the action potential moves all the way down the axon and the neuron fires completely, or it does not fire at all. 23 Objective 2.5 Identify the major neurotransmitters and explain how neurotransmitters affect behavior. Key Terms Neurotransmitters: a chemical that relays signals across the synapses between neurons. Acetylcholine: hormone involved in memory, linked to Alzheimer’s. Dopamine: hormone involved in motivation and emotion, linked to schizophrenia. Serotonin: hormone involved in mood, sleep, and aggression, linked to depression. Norepinephrine: dual role chemical. Increases arousal and plays a role in learning and memory as a neurotransmitter. Stimulates the biological responses associated with fear and anxiety as a hormone. Linked to the fight-flight response. Endorphins: released by vigorous exercise, the body’s natural pain relievers. Exercises 1. Which of the following statements about neurotransmitters is false? a. Neurotransmitters allow impulses to flow from one neuron to another. b. Neurotransmitters prevent impulses from flowing from one neuron to another. c. Neurotransmitters are stored in the cell bodies of neurons. d. Each neurotransmitter is associated with a unique receptor. e. Unused neurotransmitter are recycled by neurons and used again. 2. Fill in the blank with the appropriate neurotransmitter: A. __Norepinephrine__ influences eating, alertness, wakefulness. B. __ Acetylcholine __ is involved in movement and memory. C. __Serotonin__ affects mood and sleep. D. __Endorphins__ provide pain relief E. __Dopamine__ is involved in attention and movement 24 Objective 2.6 Explain the difference between the central and peripheral nervous systems. Key Terms Central nervous system: system that is made up of the brain and the spinal cord Peripheral nervous system: the neurons that link the CNS to skin, muscles, and glands. Exercises 1. Label each structure as belonging to the (a) central nervous system or (b) peripheral nervous system A. __a__ spinal cord B. __b__ nerves that carry messages from the brain to the body C. __a__ brain D. __b__ nerves that carry messages from the body to the brain 25 Objective 2.7 Explain the functions of the sympathetic and parasympathetic nervous systems. Key Terms Autonomic nervous system: the division of the peripheral nervous system that governs the internal activities of the human body, including heart rate, breathing, digestion, salivation, perspiration, urination, and sexual arousal. Sympathetic nervous system: division of the ANS that is involved in preparing the body for behavior, particularly in response to stress, by activating the organs and the glands in the endocrine system. Parasympathetic nervous system: division of the ANS that calms the body by slowing the heart and breathing and by allowing the body to recover from activities that the sympathetic nervous system causes. Exercises 1. During an emergency, your sympathetic nervous system prepares you for action. 2. After an emergency passes, your parasympathetic nervous system restores your physical functions to a normal state. 3. Nerves that enable your body to carry out involuntary functions are part of the autonomic nervous system. 26 Objective 2.8 Identify the medulla, pons, and cerebellum, and describe their functions. Key Terms Brain stem: oldest and innermost region of the brain. Designed to control the most basic functions of life like breathing, attention, motor responses. Medulla: area of the brain stem that controls heart rate and breathing. Cerebellum: “little brain”, situates behind the brain stem. Coordinates voluntary movement and thinking (through connections to the frontal and parietal cortex), contributes to emotional responses, discriminates between different sounds and textures. Pons: spherical shape above the medulla that helps control the movements of the body, playing a particularly important role in balance and walking. 27 Exercises 1. Fill in the chart: STRUCTURE FUNCTION BRAIN STEM Oldest and innermost part of the brain, designed to control most basic functions of life like breathing, attention, motor responses. MEDULLA Controls breathing and heart rate. In some cases this alone is enough to sustain life CEREBELLUM Coordinates voluntary movement and thinking through connections to the frontal and parietal cortex. Contributes to emotional responses and helps differentiate between sounds and textures. PONS Controls movements of the body and helps with balancing and walking 28 Objective 2.9 List the processes regulated by the hypothalamus. Key Terms Hypothalamus: brain structure that contains a number of small areas that perform a variety of functions, including linking the nervous system to the endocrine system via the pituitary gland. Located just under the thalamus, it helps regulate body temperature, hunger, thirst, and sex. Exercises 1. List five processes that are regulated by the hypothalamus: A. Body temperature B. Hunger C. Sex D. Thirst E. Creating feelings of pleasure based on the satisfactions of above needs 2. The hypothalamus is located in the a. forebrain b. hindbrain c. midbrain 29 d. spinal cord Objective 2.10 Describe the limbic system, and list the responses and behaviors affected by it. Key Terms Limbic system: responsible for memory and emotions, responses to reward and punishment. Located between the brain stem and the two cerebral hemispheres. Includes the amygdala, hypothalamus, and hippocampus. Hippocampus: consists of two “horns” that curve back from the amygdala. Stores information in long-term memory. A person cannot build new memories if it is damaged, but older memories are untouched. Amygdala: consists of two almond-shaped clusters. Primarily responsible for regulating our perceptions of, and reactions to, aggression and fear. Exercises 1. __Amygdala__ plays an important role in emotion, especially fear. 2. __Hippocampus__ enables the brain to store memories. 3. __Limbic system__ a group of structures that are involved in emotions and memory. 30 Objective 2.11 Describe the components of the cerebrum and their functions. Key Terms Cerebrum: newer part of the brain containing the cerebral cortex and corpus callosum. Corpus callosum: region that normally connects the two halves of the brain and supports communication between the hemispheres. Cerebral hemispheres: cerebral cortex is divided into two hemispheres (left and right), and each hemispheres into four lobes: frontal, parietal, occipital, and temporal. Cerebral cortex: wrinkled and folded as opposed to other animals, creating more surface area and size for increase capacities for learning, remembering, and thinking. Outer bark-like layer of the cerebrum that allows humans to use language, acquire complex skills, create tools, and live in social groups. Exercises 1. What happens in the cerebrum? It’s made up of two cerebral hemispheres and is responsible for complex human functions such as learning, remembering, thinking, languages, complex skills. 2. Label each of the following descriptions as (a) corpus callosum, (b) cerebral hemispheres, and (c) cerebral cortex. __c__ convoluted covering of the cerebrum __a__ membrane that connects the cerebral hemispheres __b__ right and left halves of the cerebrum 31 Objective 2.12 Explain the functions of the frontal lobes. Key Terms Association areas: areas in which sensory and motor information is combined and associated with our stored knowledge. Involve higher mental functions like learning, thinking, planning, judging, moral reflecting, figuring, and spatial reasoning. Frontal lobes: responsible primarily for thinking, planning, memory, and judgement. Motor cortex: part of the cortex that controls and executes movements of the body by sending signals to the cerebellum and spinal cord. Broca's area: left frontal lobe, controls facial movements and the production of language. Broca's aphasia: resulted from a stroke or trauma to the Broca’s area that affects the ability to speak. 32 Exercises 1. Fill in the chart: STRUCTURE FUNCTION ASSOCIATION Sensory and motor information combination to associate to AREAS stored knowledge. Serve to support higher mental functions like learning, thinking, planning, judging, moral reflecting, figuring, and spatial reasoning MOTOR Controls and executes movements of the body CORTEX BROCA'S Controls facial movements and the production of language AREA 2. Which is the best description of the language abilities of a person who suffers from Broca's aphasia? a. They cannot understand spoken language. b. They can only understand the speech of others who speak very slowly. c. Their speech cannot be understood by others. d. They must put forth a great deal of effort to speak. 33 Objective 2.13 Explain plasticity. Key Terms Plasticity: the brain’s ability to change its structure and function in response to experience or damage, enabling us to learn and remember new things and adjust to new experiences. Exercises 1. What is plasticity? The brain’s ability to change its structure and function in response to experience or damage, enabling us to learn and remember new things and adjust to new experiences. 2. What is the relationship between age and plasticity? The brain is most “plastic” when young and continues to be observed as adults as we learn new information. 34 Objective 2.14 Define the endocrine system and explain the influence of the pituitary and adrenal glands on behavior. Key Terms Endocrine system: the chemical regulator of the body that consists of glands that secrete hormones Hormones: chemical that moves throughout the body to help regulate emotions and behaviors Pituitary gland: small pea-sized gland located near the center of the brain. Responsible for controlling the body’s growth. Adrenal glands: located on top of each kidney. Produce hormones that regulate salt and water balance in the body, and involved in metabolism, the immune system, and sexual development and function. Exercises 1. The endocrine system is a series of glands that produce hormones . 2. The adrenal glands produce norepinephrine and epinephrine. 3. The pituitary gland is the body's "master gland" and produces hormones that contribute to growth. 35 Objective 2.15 Define behavior genetics. Describe the function of the mirror neuron system (MNS). Key Terms Mirror neuron system (MNS): neurons in the frontal lobes that provide the biological basis for observational learning. Behavior genetics: research techniques that scientists use to learn about the genetic and environmental influences on human behavior by comparing the traits of biologically and nonbiologically related family members. Exercises 1. Behavioral geneticists use family studies and adoptive studies to examine the relative effects of genetics and environments on behavior. 2. What is the role of the MNS in learning from and teaching other? They support learning through mental imitation and contribute to perception of others’ emotions and to empathy. 36