Intelligence: Nature or Nurture?

Intelligence as defined by the Cambridge dictionary is the ability to learn, understand, and make judgments or have opinions that are based on reason.1 There is much debate and controversy on this subject and psychologists do not all agree upon a standard definition. Yet, one of the very first definitions of intelligence was developed by the psychologists responsible for the development of the first intelligence test, Binet and Simon (1905) who argued that the essence of intelligence is: ‘to judge well, to comprehend well, to reason well’.2 Another sample definition was provided later by Heim, in 1970, who argued that ‘intelligent activity consists in grasping the essentials in a situation and responding appropriately to them’.3 There are also arguments surrounding how many different types of intelligence there are, as well as the intelligence theories of psychology. However elusive, we can ascertain that all psychologists have universally agreed upon general intelligence (g), an expression devised by the English psychologist Charles Spearman and defined as ‘a mental attribute called on for virtually any task’.4 This essay will inform the reader of the different methods proposed and used by psychologists to assess ability and discuss their evaluations.

Each theory of intelligence has not only a different method of testing intelligence, but also a different definition of intelligence, which each creator ascribes to. Stanford-Binet Intelligence Scales (Terman, 1916), or IQ tests as they are commonly referred to as, are currently one of the most widely used tools for intelligence measurement, however, research suggests they are a poor predictor of future academic success for particular cultural groups (Gardner, 1993). In one of the largest neurocognitive-based intelligence studies performed to date, it was revealed through the observation of neuroimaging data that IQ scores alone were not likely to indicate a fundamental intellectual ability because intelligence is composed of multiple anatomically distinct components (Hampshire, Highfield, Parkin, & Owen, 2012). Considering this development, it would appear that IQ tests are only measuring one subsection of intelligence, located in the frontoparietal cortex (Gray, Chabris, & Braver, 2003; Hampshire, Highfield, Parkin, & Owen, 2012). In order to provide analogous statistics to base research upon, it is vital to create multifaceted, culturally sensitive measurements because cultures differ greatly in the emphasis they place on certain aspects of intelligence (Sternberg, Grigorenko, & Kidd, 2005).

Charles Spearman's model of intelligence and Howard Gardner's multiple intelligence theory are two of the most widely used theories of intelligence. In order to understand how similar the two theories are we must first understand their differences. These two men differed in opinion on how IQ and intelligence should be measured, and they differed in opinion on what made a person "smart". In order to examine these things they first had to understand the human brain and how it works. They had to examine the human study habits and rituals, along with the human test taking habits.

Sir Francis Galton (1869, 1883) quantified traits that were assumed to be correlated, and developed the first comprehensive test of intelligence. By the end of the 19th century, the foundation was laid for modern day intelligence testing (Wicket, 1998). In 1905, the French psychologist Alfred Binet published the first modern intelligence test to identify students who needed special help in coping with the school curriculum (Neiser, et al. 1996). Shortly thereafter in 1908 and 1911, Alfred Binet and Theodore Simon published revisions of the Binet intelligence test (Wicket). The mental age concept was adopted to express the results in adequate units. The concept is based on an individual’s performance in comparison to the average performance of individuals in a specific chronological age group (Kaplin, & Saccuzzo).

Firstly, we already know what intelligence is, however, in psychology, intelligence is difficult to define, as it is seen differently by everyone. There are different kinds of intelligence, such as academic, creative and emotional. There are also several theories and research studies which have explored whether intelligence is inherited or how it should and can be measured. The five main intelligence theories that are used are Spearman’s Two Factor Theory (1904,1927), Thurstone’s Theory of Primary Mental Abilities (1938), Gardner’s Theory of Multiple Intelligences (1983), Sternberg’s Triarchic Theory (1985) and Goleman’s Emotional Intelligence Theory (1998).

     A renowned professor of education and psychology at Harvard University, Howard Gardner has radically changed the way we look at intelligence. In 1983 Gardner published the first of two books that theorize that there are multiple intelligences. Gardner believes “that human cognitive competence is better described in terms of a set of abilities, talents, or mental skills, which we call “intelligence” (378). Gardner’s theory dismisses the idea that intelligence is a single attribute of the mind and suggests that there are different types of intelligences that account for different human

In 1905 Binet and Simon tested their measurements on another fifty children whom their school teachers considered to be of average intelligence for their ages. This test was to enable Binet to examine the levels of intelligent behaviors between children of the same age. Some of the tests on Binets scale were very simple, including asking a child to follow the direction of movement of a lighted match, and then maybe slightly harder was to repeat back a three digit sequence of numbers or sentences. There were a few harder tests involved which would require a child to make a sentence out of maybe three or four words, or to reproduce a drawing from memory.

The term intelligence begs an important question. How can something be measured when it is indefinable? Numerous scientists, psychologists, theorists, neurologists, and many more can concur that intelligence does exist. Yet, to date, none of them can agree upon a universal definition. Therefore, intelligence is known only to be a scientific construct. (Floyd & Kranzler, 2013). Over the years, individuals have attempted to delimit intelligence by means of research, assessments, and theories. Beginning as early as the 19th century, Francis Joseph Gall, presented the scientific measuring tool known as phrenology. He believed mental qualities and functions could be evaluated according to specific faculties mapped out in the brain. (CIA textbook)

Intelligence is used by everyone to help them in everyday life. Where people get their intelligence, however, is debatable. A person is born with an amount of inherited intelligence; this intelligence is considered nature, genetic, or heredity. Then there is intelligence that comes from the ability to learn from experience; this intelligence is impacted by nurture or the environment. It is known that both genetic and environmental factors determine intelligence, but the subject is controversial among professionals. Does nature or nurture have a bigger impact on intelligence? Is it true that some people are born with high intelligence, but are limited by their environment? Given the proper tools, can a person increase their intelligence? How accurate are IQ tests?

Before the Stanford-Binet became what it is today, it was first called the Binet-Simon Scale. Alfred Binet believed intelligence was a multifaceted trait that could be determined by assessing an individual’s reasoning and problem-solving skills. In 1905, he and a colleague developed the first assessment of mental ability titled the Binet-Simon Scale (Miller, Lovler, & McIntire, 2013, p. 9). Binet was exceedingly influential to psychologists world-wide and the assessment he co-developed was utilized in

What is intelligence exactly? Intelligence is the ability to acquire and apply knowledge and skills or “the ability to learn and understand things to

There are many definitions for the term intelligence several of these are as follows: A term usually referring to a general mental capability to reason, solve problems, think abstractly, learn and understand new material, and profit from past experience. Intelligence can be measured by many different kinds of tasks. Likewise, this ability is expressed in many aspects of a person’s life. Intelligence draws on a variety of mental processes, including memory, learning, perception, decision-making, thinking, and reasoning. ("Intelligence," Microsoft® Encarta® Online Encyclopedia 2006); (1) the ability to learn or understand or to deal with new or trying situations reason; the skilled use of reason (2) the ability to apply knowledge to manipulate one 's environment or to think abstractly as measured by objective criteria (as tests). (Merriam-Webster.com)

On the contrary, those people who scored low on one kinds of ability test, were more likely to score badly on others as well. Meanwhile, Spearman also concluded that intelligence is a cognitive ability which could be measured and expressed numerically.

His concept involved the idea that certain mental tasks are appropriate to certain ages, such as the ability to recite the names of the months: while expected of a ten year old, such ability would be rare in a three year old. Binet quantified intelligence as the Intelligence Quotient (IQ): the ratio of mental age to chronological age, multiplied by 100. Reasoning that low intelligence stemmed from improper development, Binet envisioned the test as a first step in treatment: a diagnostic instrument used to detect children with inadequate intelligence in order to treat them using "mental orthopedics."

When a person utters the word “intelligence,” people tend to think of a genius like Albert Einstein developing some obscure equation that the great majority of the population will never understand. The problem with the definition of intelligence is that people relate intelligence to words like “genius” which require intelligence but do not have the same definition as intelligence. Often, people try to use related words to define intelligence, but these words are unable to define intelligence since many are only different levels of intelligence. While many definitions try to encompass the meaning of intelligence and various definitions describe a small part of intelligence, no definition completely explains intelligence, because