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Difficulties in defining intelligence
Difficulties in defining intelligence
Intelligence depends more on the environment than genetic factors
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Genetic and Environmental Factors of Intelligence
One of the most interesting and controversial areas in behavioral genetics, human intelligence is currently assumed to be subject to both genetic and environmental influences.
While this assumption is accepted by a majority of geneticists and behavioral scientists, there is great disagreement on the degree of influence each contributes. Arguments for environmental influences are compelling; at the same time there is growing evidence that genetic influence on intelligence is significant and substantial (Eyesenck, 1998; Mackintosh, 1998; Plomin, 1994; Steen, 1996). The purpose of this paper is to explore the question: "How is intelligence influenced by heredity and environment?"
What is Intelligence?
It is often difficult to remember that intelligence is purely a social construct, and as such is limited to operational definitions. Binet & Simon (1905, as cited in Mackintosh) defined it purely in terms of mental ability: "the ability to judge well, to comprehend well, to reason well." Wechsler (1944, as cited in Mackintosh) added behavioral factors: "the aggregate or global capacity of the individual to act purposefully, to think rationally, and to deal effectively with the environment." Sternberg (1985) synthesizes the previous definitions, defining intelligence as "the mental capacity of emitting contextually appropriate behavior at those regions in the experiential continuum that involve response to novelty or automatization of information processing as a function of metacomponents, performance components, and knowledge acquisition components." Gardner (1993) took the definition to a societal level, as "the ability or skill to solve problems or to fashion products which...
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General intelligence tends to relate to various degrees with each other (Cohen 2012). An example of this is that if an individual is good in math, they may also be good in spelling. In this weeks reading we reviewed several different models of measurement of intelligence. In regard to these theories and general intelligence (g), the theories are various but have commonality and overlap. The Spearman's two-factor theory is if a test has high correlation with other test than the measurement of g is highly saturated (Cohen, 2012). The greater the importance of g on a test, the better the test is believed to predict intelligence
Today, realising that genes and environment cooperate and interact synergistically, traditional dichotomy of nature vs. nurture is commonly seen as a false dichotomy. Especially operant conditioning, i.e. the learning of the consequences of one's own behavior can lead to positive feedback loops between genetic predispositions and behavioral consequences that render the question as to cause and effect nonsensical. Positive feedback has the inherent tendency to exponentially amplify any initial small differences. For example, an at birth negligible difference between two brothers in a gene affecting IQ to a small percentage, may lead to one discovering a book the will spark his interest in reading, while the other never gets to see that book. One becomes an avid reader who loves intellectual challenges while the other never finds a real interest in books, but hangs out with his friends more often. Eventually, the reading brother may end up with highly different IQ scores in standardized tests, simply because the book loving brother has had more opportunities to train his brain. Had both brother received identical environmental input, their IQ scores would hardly differ.
Intelligence tests have been developed by scientists as a tool to categorize army recruits or analyze school children. But still discussing what intelligence is, academics have a difficult time defining what intelligence tests should measure. According to the American researcher Thorndike, intelligence is only that what intelligence tests claim it is (Comer, Gould, & Furnham, 2013). Thus, depending on what is being researched in the test and depending on the scientist’s definition of intelligence the meaning of the word intelligence may vary a lot. This essay will discuss what intelligence is in order to be able to understand the intelligence theories and aims of intelligence tests.
A complex and relatively new field of study, behavioral genetics is particularly interesting because is sheds light on the inner workings of a favorite subject: ourselves. Human behavioral genetics is broadly defined as the examination and characterization of genes as a basis for human behavior. The link between genetics and behavior was first recognized by Sir Francis Galton, a 19th century scientist and cousin of the very famous Charles Darwin, who studied the heritability of mental abilities of close relatives and family members (Stigler, 2010). Since then, genetics has been linked to many more behavioral phenotypes from eating and mating activities to substance abuse, social attitudes, violence and mental abilities. Geneticists are able to study this by analyzing parallels in physical and behavioral characteristics of families and populations (Rothstein, 2005). However, as with many other new scientific fields, the study of behavioral genetics and its implications has been the subject of increasing scrutiny and co...
During the early 1980’s, research revealed that those raised in family settings with the benefit of early intervention programs made remarkable progress, far exceeding the expectations of doctors who first described the
Steen, R. Grant. DNA and Destiny: Nurture and Nature in Human Behavior. New York: Plenum Press, 1996.
...ctors, not environment. Nomothetic approach suggests that this is because everyone is generally the same. Yet intelligence is poor when environment is poor - idiographic explain this as it stress social influence, but nomothetic would ignore this factor.
The nature- nurture debate has many different case studies, which often questions environmental and hereditary aspects of the nature- nurture debate. A tangent which is focused on in this essay is how the case studies of schizophrenia and IQ, specifically affect twin and adoption studies. This essay will firstly, give a brief outline of the nature-nurture debate and the definitions of twin and adoption studies. Secondly, it will illustrate two main case studies, which are IQ and Schizophrenia studies. Thirdly, will contrast and compare the two and research’s impact on the case studies in regards to nature vs. nurture and finally, will conclude with the impact of the nature-nurture debate and twin and adoption studies.
Intelligence is a function of how well the brain works, and it's well established that our brains are designed by genes so it's not entirely surprising that some deem this as proof that our genes play a part in deciding a person’s intelligence. However, this is not a widely accepted fact and many scholars would argue intelligence is indeed not fixed by ones genes but instead manipulated by other factors.
In the adopting method, behavioral geneticists study children adopted shortly after birth. By comparing their abilities and personality traits to those o their adoptive family members with whom they live and those of their biological parents whom they may have met, researchers can disentangle the effect of heredity and environment (Plomin et al., 19...
Rodgers, Joseph Lee. (2001). What causes birth order-intelligence patterns? The admixture hypothesis revived. American Psychologist, 56(6-7), 505-510. doi: 1O.1O37//O0O3-O66X.56.6-7.5O5
Intelligence by definition is “the ability to acquire and apply knowledge and skills” (Oxford Dictionary, 2014). However, many psychologists argue that there is no standard definition of ‘intelligence’, and there have been many different theories over time as psychologists try to find better ways to define this concept (Boundless 2013). While some believe in a single, general intelligence, others believe that intelligence involves multiple abilities and skills. Another largely debated concept is whether intelligence is genetically determined and fixed, or whether is it open to change, through learning and environmental influence. This is commonly known as the nature vs. nurture debate.
Sternberg’s theory defines intelligence as mental activity directed towards purposive adaption to, selection and shaping of, real-world environments relevant to one’s life (Santrock, 2013). According to Sternberg intelligence is more than just a single, general ability, he proposed successful intelligence consist of three factors. The three factors include analytical intelligence, creative intelligence, and practical intelligence (Santrock, 2014).
Heredity Versus Environment - The Nature-nurture Controversy, Exploring Heredity And Environment: Research Methods, Beyond Heritability
As numerous research and studies' findings have shown, both nature and nurture work together. These shouldn't be considered as separate, but instead intertwined, as they both interact and depend on each other. An interaction of genetic and environmental factors are responsible for influencing and determining intelligence levels.