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Evolution of psychometric IQ theories from Spearman g to CHC: With special analysis of AAIDD ID/MR 2010 manaul

This presentation traces the evolution of psychometric theories of intelligence from Spearman's g to contemporary CHC. In addition, it simultaneously tracks the evolution of psychometric tests of intelligence as they relate to psychometric theories. Finally, there is a special emphasis on tracking changes in the AAMR/AAIDD intellectual disability (mental retardation) classification manuals over the same period. It is concluded that despite significant advances in psychometric theories of intelligence and contemporary psychometric intelligence tests, the official 2010 AAIDD manual is significantly behind these developments. The 2010 AAIDD manual is "stuck on g" and has failed to incorporate advances in both psychometric theories and tests of intelligence. A significant intelligence theory--AAIDD ID/MR definition gap exists tat has potential serious consequences for individuals with ID/MR.

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The evolution of psychometric theories of intelligence from Spearman’s g to contemporary CHC:  With Special analysis and commentary on the 2010 AAIDD ID/MR definition—intelligence theory gap,[object Object],Kevin S. McGrew, PhD.,[object Object],Institute for Applied Psychometrics (IAP) – Director,[object Object],[www.iapsych.com],[object Object],Conflict of interest disclosure:  Kevin McGrew is a co-author of (and thus has a financial interest in) the WJ III Battery, a battery of cognitive and achievement tests mentioned in this presentation.  This presentation reflects the views of Kevin McGrew and do not necessarily reflect the views of the other WJ III authors or the publisher of the battery. ,[object Object]
The current set of slides have been adapted and revised from three primary sources.  Viewers of this presentation can find additional background information and detail by consulting the following sources.,[object Object],The IAP CHC Timeline Project @ http://tinyurl.com/ykz4wwm,[object Object],McGrew, K. (2009).  Editorial:  CHC theory and the human cognitive abilities project: Standing on the shoulders of the giants of psychometric intelligence research, Intelligence, 37, 1-10. ,[object Object],McGrew, K. S. (2005).  The Cattell-Horn-Carroll (CHC) theory of cognitive abilities:  Past, present and future. In D. Flanagan, & Harrison (Eds.), Contemporary intellectual assessment: Theories, tests, and issues-Second Edition (p.136-202). New York: Guilford Press,[object Object],(both manuscripts can be accessed @ http://tinyurl.com/ykzesml,[object Object]
Note……icons in the timeline specific slides are not active.  They,[object Object],are only active when using the timeline software used to develop ,[object Object],the CHC Timeline Project,[object Object]
Galton lab and individual differences research  (1884-1889),[object Object]
“Mental test” concept born:  James McKeen Cattell (1885-1890),[object Object]
Charles Spearman (1904),[object Object]
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