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Clocking the Mind: Mental Chronometry and Individual Differences Hardcover – September 13, 2006

4.7 out of 5 stars 3 customer reviews

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Product Details

  • Hardcover: 286 pages
  • Publisher: Elsevier Science; 1 edition (September 13, 2006)
  • Language: English
  • ISBN-10: 0080449395
  • ISBN-13: 978-0080449395
  • Product Dimensions: 6.1 x 0.7 x 9.2 inches
  • Shipping Weight: 1.5 pounds (View shipping rates and policies)
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (3 customer reviews)
  • Amazon Best Sellers Rank: #621,473 in Books (See Top 100 in Books)

Customer Reviews

Top Customer Reviews

Format: Hardcover
Arthur Jensen is a controversial figure in psychology, due in large part to claims about racial differences in intelligence. In his newest book, "Clocking the Mind," Jensen turns his attention to a more focused, yet still controversial topic: how is it that extraordinarily simple measures of reaction time can correlate so highly with intelligence?

To understand the importance of this question, consider the following. First, as Jensen notes, almost all reliable measures of cognitive performance are correlated. Across a large number of such tests, a single number - termed g, for "general intelligence" - can account for a large portion of individual differences on each task. Because no single test is "process pure," the correlations between g and scores on any given test are typically rather small; high correlations emerge from these measures only when they are considered in aggregate, with the following exception.

Despite the fact that g is commonly assessed with tests of vocabulary, memory for associations, reasoning ability on the Raven's Progressive Matrices (where subjects must discover a visual pattern within a matrix of stimuli, and select what the next pattern in the sequence would look like), and a wide variety of other very abstract and untimed tests, it appears that the variance they share can be reliably and accurately indexed by reaction time on a task where subjects must merely press a lighted button. The correlations between such simple tasks and g is around .62, which is higher than the correlation between many subscales of IQ tests and the g factor to which they contribute.

If you are skeptical of these results, you are not alone.
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Format: Hardcover Verified Purchase
If you are interested in the scientific end of psychology on an important topic, this is a book for you. Sticking close to the facts and drawing conclusions only when supported by data calls for close reading, but I found the result satisfying.
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Format: Hardcover Verified Purchase
This book is essential reading for anyone who has some background in studies of reaction time. The subject is covered from an historical point of view and and its practical and diagnostic application in studying brain function.

Selwyn Super
Neuropsychologist and neuro-optometrist.
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