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Intelligence as measured by Psychometric tests has been found to be highly correlated with successful training and performance outcomes (e.g., adaptive performance), [76] [77] [78] and IQ/g is the single best predictor of successful job performance; however, some researchers although largely concurring with this finding have advised caution in ...
Evidence of a general factor of intelligence has been observed in non-human animals. First described in humans, the g factor has since been identified in a number of non-human species. [45] Cognitive ability and intelligence cannot be measured using the same, largely verbally dependent, scales developed for humans.
Even before IQ tests were invented, there were attempts to classify people into intelligence categories by observing their behavior in daily life. [10] [11] Those other forms of behavioral observation were historically important for validating classifications based primarily on IQ test scores. Some early intelligence classifications by IQ ...
IQ tests are valid measurements of a real human ability—what people generally describe as "intelligence"—that is important to many parts of contemporary life. Intelligence, as measured by IQ tests, is about 80 percent heritable. Intelligent parents are much more likely to have intelligent children than other parents.
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
Studies have found cortical thickness to explain 5% in the variance of intelligence among individuals. [21] In a study conducted to find associations between cortical thickness and general intelligence between different groups of people, sex did not play a role in intelligence. [37]
The Flynn effect is the increase in average intelligence test scores by about 0.3% annually, resulting in the average person today scoring 15 points higher in IQ compared to the generation 50 years ago. [62] This effect can be explained by a generally more stimulating environment for all people.
He argues that substantial correlations between intelligence test scores and measures of well-being exist when the analysis is limited to developed countries, where the IQ results are more likely to be accurate. [5] According to Hunt, such studies are important because they measure the cognitive skills necessary to excel in a post-industrial world.