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[quote=Anonymous][quote=Anonymous]Did your psychologist suggest a GAI?[/quote]

More at NAGC link:

http://www.nagc.org/index.aspx?id=2455

It is recommended practice to derive the General Ability Index (GAI) when there are large disparities among the Composite/Index scores (Flanagan & Kaufman, 2004; Weiss, Saklofske, Prifitera & Holdnack, 2006).  Flanagan and Kaufman (2004), in Essentials of WISC-IV Assessment, deem the FSIQ “not interpretable” if Composite scores vary by 23 points (1.5 standard deviations) or more.  The GAI utilizes only scores from the Verbal Comprehension and Perceptual Reasoning Composites, not Working Memory and Processing Speed.  If the Verbal Comprehension and Perceptual Reasoning Composite scores vary by less than 23 points, “the GAI may be calculated and interpreted as a reliable and valid estimate of a child’s global intellectual ability” (p. 128).  Use of the GAI takes on special significance with the gifted. Verbal Comprehension and Perceptual Reasoning tasks are heavily loaded on abstract reasoning ability and are better indicators of giftedness than Working Memory (auditory memory that is manipulated) and Processing Speed (speed on paper-and-pencil tasks).  Pearson, publisher of the WISC-IV, provides GAI tables on its website in support of similar use of the GAI when the variance between Composite scores is both significant and unusual (see Technical Report #4).[/quote]

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