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Nature v/s Nurture debate on
intelligence
Introduction:
The ability to measure intelligence has been through IQ tests and such. These tests
can tell us the base intelligence of a person through various mechanisms and quizzes which
provides a good understanding of how smart a person is. Intelligence is variable, but a
consensus has been reached, regarding connections between behaviour and context.
However, one, still quite a disputable and notorious aspect of intelligence is its cause. This
brings us to the war of nature versus nurture. Nature refers to the innate intelligence one
acquires through genes and nurture refers to the intelligence that is learnt through the
environment by methods of trial and error or otherwise. This debate has been ongoing since
the 1800s with no evident end in sight. Various psychologists have tried to present their
views on it trying to tip the scales towards either nature or nurture. We will examine two
research articles and attempt to formulate a learned opinion on this debate.
Old article:
An interesting article to accurately understand the concept of ‘Intelligence’ and what
we mean by it is ‘Intelligence and the Logic of the Nature-Nurture Issue’ by John White.
John (1974) explained that an intelligent person must be judged by an intelligent act and that
an intelligent act must be judged by connections between several actions and their
correlations. He also propounded that empirical research could not settle the nature-nurture
debate. He quite frequently quotes and brings forth Francis Galton, the one who coined the
term nature-nurture and was the pioneer of its research. In his article, ‘The History of Twins,
as a criterion of the relative powers of nature and nurture’, Galton (1875) makes history by
conducting research on twins to get a direct estimate of heritability. Heritability is the effect
that differences in genes have on differences in IQ scores. Since twins have identical genes,
heritability can be calculated by measuring the difference in IQ scores in twins instead of the
differences in IQ scores of individuals picked randomly. Galton (1875) concluded that nature
had a higher effect on IQ scores than nurture or the environment. However, Joseph McVicker
Hunt argues that while genes may place an upper limit on intelligence, they do not guarantee
its ability to reach that potential, therefore not fixing a level of intelligence and leaving room
for the environment. This debate on the cause of intelligence has also been dragged into
several political debates. A prominent one is the scandal of the gap in the scores between
black Americans and white Americans. Concluding that the differences were due to an innate
polarity, public funding of social programmes designed to educationally compensate minority
groups was eliminated. The Society for the Psychological Study of Social Issues spoke out
against this in 1969 saying that the exact contribution of heredity to intelligence could only
be measured when the social conditions were equal for social groups were equal and had
been so for several generations. With newer research being put forth, this dichotomy of the
nature-nurture debate would soon see an end.
New article:
The debate over whether "nature" or "nurture" determines how we turn out is a
longstanding one. It is an old saw which says that: parents believe that nurture is the most
essential factor when their first baby is born. But when their second baby is born, they tend to
believe in nature. The confirmation of this adage is given by how people answered in a
survey in, “Unique: The New Science of Human Individuality", cited by David. J. Linden. In
his book, Linden, a neuroscientist at John Hopkins University sets out to look at everything
that makes us distinctly ourselves: our height and weight, food preferences, personality
styles, gender identity, racial identity, sexual orientation and intelligence. Robin Marantz
Henig has written an article on the topic titled, ‘Beyond Nature vs. Nurture, What Makes Us
Ourselves? referencing Linden’s book. But Henig (2020) questions whether these qualities
are carried in our genes or the roles of the life we live, every experience, the books we read,
etc. make us who we are. He says that in ordinary English nurture means how your parents
raise you, he writes. But, of course, that’s only one small part of the nonhereditary
determination of traits. Henig (2020) prefers using the word "experience" in which a broad
range of factors, beginning in the womb and carrying through every memory, every meal,
every scent, every romantic encounter, and every illness from before birth to the moment of
death; is encompassed. Filtered through the inherent randomness of development, our
individuality emerges through heredity interacting with experience. Henig (2020), in his
article, sheds light upon this. Linden's (2019) "Unique", includes findings from decades, the
worth of twin studies. These twin studies gave scientists some of their first insights into
understanding how much behaviour and personality might be inherited and how much
acquired. Henig (2020) marches into the territory where many other scientists fear to tread:
race, sexual orientation, and the genetics of gender identity. Linden acknowledges certain
genetic differences among some populations but also emphasizes that they don’t necessarily
align with the social binaries of male/female, black/white, etc. Thus, this article highlights the
importance of going beyond the dichotomy of nature vs nurture and finding out what actually
makes us "ourselves".
Insights:
The article compelled us to research the nature-nurture dilemma and intelligence indepth. This caused both, a strong knowledge of the subject and a diverse understanding
through multiple perspectives. Intelligence is a very relative term considering that a horse is
smarter in the field of donkeys. We had never thought of what makes humans intelligent and
how it affects us, or whether it can be changed. We are sure that learning in this way will
make us think more insightfully, trying to understand humans on a deeper level. These
articles gave us an in-depth and extensive understanding of the actual meaning of the two
terms. Both Nature and Nurture are two sides of the same coin, and their interdependency
formulates our intelligence. Through this research, we understood how behavioural genetics
has enabled psychology to quantify the relative contribution of Nature and Nurture with
regard to specific psychological traits. Through the research of these articles, we eventually
discarded our extreme naturist or nurturist views and developed our interest in researching
how nature and nurture interact in a host of different ways. This debate of nature vs nurture is
concerned with the relative contribution that both influences make to human behaviour, such
as cognitive traits, personality, temperament and psychopathology. The way in which racism
was incorporated into the dilemma is also very important. It showed us the side of humanity
that uses creative inventions for the destruction of society, and scientific progress that sets us
back in terms of humanity.
This phrase "nature vs nurture" coined by the Victorian polymath Francis Galton, is
now perceived differently by different people. It is now beyond the concept that the
environment is what makes us who we are. The balance between Nature and Nature is
extremely essential.
Opinions:
After analysing various perspectives and conclusions and experiments, it can surely
be said that intelligence does not have one particular cause. Intelligence, just as any other
human phenomenon is a complex peculiarity. We believe that whatever the cause of
intelligence may be, it is not one particular measurable cause and nor can it be manipulated
through environment or genes. We also believe that great care should be taken so that
scientific progress is never used negatively. In our opinion, the framed debate between nature
vs nature has always been based upon the dominance of one over the other. But
acknowledging that both nature and nurture play a role in psychological development and
interact in complex ways, is extremely crucial. We do agree that nature is more influential
than nurture (according to the traditional notion), but after researching and gaining an indepth understanding of our topic, we have learnt that going beyond this debate is the need of
the hour. This is because understanding the role of both nature and nurture in the
development of a human being helps one study intelligence and personality better.
Learnings:
271: Writing a research article has taught us quite a bit about research, articulation
and complexly understanding a concept or dilemma in depth. One of the first difficulties we
faced was finding articles and extracting content from them without confusing ourselves or
the reader. This made us properly comprehend the topic in such a manner that it could be
simplified yet retain its intricacy. Intelligence and its relation to nature and nurture is not a
topic that can be easily digested, but because of the method by which we studied it, the
subject unfolded quite well. We also learnt the APA format which as Arts students will be
highly helpful for us in our studies.
272: As a result of our research, we clearly understood that intelligence is influenced
not solely by genetic factors, but also by environmental factors, i.e. by both Nature and
Nurture. Genetic factors have been identified as the influential forces of nature that shape
intelligence, whereas environmental factors influence intelligence through exposure or rather
nature. We learnt how nurture or environmental factors differentiate between children's
cognitive development and how nature or genetic factors are influential forces that shape
intelligence. Research and thorough reading taught us the importance of looking at things
from different perspectives. We learnt that every perspective is important, as it helps one to
analyse and understand things better. Understanding the interdependency between nature and
nurture thus made us realise that balance between the two is crucial.
Conclusion:
To conclude, one must first accept that such a debate can never truly end. Secondly,
we find through careful examination of several articles both new and old, that this dispute has
carried on for years and will for many more to come. We must understand the
interdependency that both nature and nurture hold over human intelligence to truly
comprehend the human mind, rather than quarrelling over its causes. The fact of the matter is
that intelligence is caused neither by nature nor nurture singularly, but by a complex union of
both and perhaps more. And this fact is not a compromise but a result of intense research on
intelligence.
References:
John White. (1974). Intelligence and the logic of the nature-nurture issue.
https://discovery.ucl.ac.uk/id/eprint/10121301/1/White_ch1intelligence.pdf
Francis Galton, F.R.S. (1875). The history of twins, as a criterion or the relative powers of
nature and nurture. https://galton.org/essays/1870-1879/galton-1875-history-twins.pdf
Grace Rubin-Rabson. (1974). Nature—Nurture and the Intelligence Issue.
https://www.jstor.org/stable/274607?searchText=nature+nurture+and+intelligence&searchUr
i=%2Faction%2FdoBasicSearch%3FQuery%3Dnature%2Bnurture%2Band%2Bintelligence
&ab_segments=0%2FSYC-6744_basic_search%2Fcontrol&refreqid=fastlydefault%3A57230d89958b48df9783d7f4a5340eef&seq=4
Mairi Levitt. (2013). Perception of nature, nurture and behaviour.
https://lsspjournal.biomedcentral.com/articles/10.1186/2195-7819-9-13
Sara A. Hart. (2021). Nurture might be nature: cautionary tales and proposed solutions.
https://www.nature.com/articles/s41539-020-00079-z
Claire Haworth. (2014). Why nurture is just as important as nature for understanding
genetics. https://theconversation.com/why-nurture-is-just-as-important-as-nature-forunderstanding-genetics-30231
Robin Marantz Henig. (2020). Beyond Nature vs. Nurture, What Makes Us Ourselves?
https://www.nytimes.com/2020/09/29/books/review/unique-david-j-linden.html
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