Brendan Kelly Ph.D.

Brendan Kelly is Professor Emeritus at the University of Toronto. He is author of over 50 books including the recent "Intelligence, IQ & Perception", and "Intelligence: Where we Were, Where we Are & Where we’re Going." He holds two doctorate degrees: a Ph.D. in Mathematics (Number Theory) from U. of T. and an Ed.D. in Computer Applications from the Ontario Institute for Studies in Education, and he curates his site on Quora titled, “IQ & Intelligence.”

Is there a point in life (age) that your intelligence and ability to learn will be at its peak? At which point (on average) will this start to decline quickly?

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In the 1940’s, psychologist Raymond B. Cattell attempted to create “culture-free” tests of intelligence. Believing that IQ tests contain implicit biases in favor of particular cultures, he sought to apply factor analysis to partition the g factor of intelligence (as measured by IQ) into two components–fluid and crystallized. He described fluid intelligence, as “a capacity …

Is there a point in life (age) that your intelligence and ability to learn will be at its peak? At which point (on average) will this start to decline quickly? Read More »

What is the average IQ of students by their chosen degree? I just found an old statistic.

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Comparing average IQ’s across college majors can be misleading because the variation in IQ’s within a major is much greater than the variation across majors. That is, there is a very wide difference in the IQ’s of students in any particular major, so the person with the highest IQ in a major like education may …

What is the average IQ of students by their chosen degree? I just found an old statistic. Read More »

What is the correlation between IQ and job performance?

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The efficacy of IQ tests in predicting job performance is well established in the research. Linda Gottfredson, one of the leading researchers in the implications of general intelligence, g, (as measured by IQ tests) states: (Gottfredson, Linda S. “Why g Matters: The Complexity of Everyday Life.” 1997. Intellignce 24 (1) pp. 79-132.) Personnel selection research …

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Is there any single word or term used to distinguish between the intellectual capabilities of humans and animals?

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Intelligence for sentient beings has been defined as the ability to perceive or infer information, and to retain it as knowledge to be applied towards adaptive behaviors within an environment or context. For example, monkeys have learned how to use rocks to crack the shells of nuts to feed themselves. Corvids (including crows and ravens) …

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Is intuition in MBTI synonymous with fluid intelligence?

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No, they measure different things. The Myers-Briggs Type indicator (MBTI) attempts to classify an individual’s personality according to four variables: introvert or extravert, sensing or intuitive, thinking or feeling, and judging or perceiving. Since there are four categories, each with two choices, there are 24 or 16 possible personality types in this rubric. If the …

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