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Focus on Autism and Other Developmental Disabilities
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A Car Goes in the Garage Like a Can of Peas Goes in the Refrigerator

Do Deficits in Real-World Knowledge Affect the Assessment of Intelligence in Individuals With Autism?

Meredyth Goldberg Edelson

Willamette University in Salem, Oregon, medelson{at}willamette.edu

The Test of Nonverbal Intelligence—3rd Edition (TONI-3) and the Analogic Reasoning (AR) subscale of the Universal Nonverbal Intelligence Test (UNIT) Were administered to 35 individuals With autism to determine Whether real-World-knoWledge deficits affected intelligence scores. The 2 tests are similar in format; hoWever, the TONI-3 includes only abstract reasoning items, While the AR subscale includes both abstract reasoning and real-World-knoWledge items. The results indicated that although there Were no significant differences in overall scores across the 2 measures, the number of items pertaining to real-World knoWledge completed on the AR subscale did differentiate test scores. Participants completing a greater percentage of real-World-knoWledge items on the AR subscale scored more than 8 points better on the TONI-3; no differences Were found betWeen the tWo tests for those completing feWer real-World-knoWledge items. When age Was controlled for, it Was found that participants completing a greater percentage of real-World-knoWledge items on the AR subscale scored more than 13 points higher on the TONI-3. The implications of these results for the assessment of individuals With autism are discussed.

Focus on Autism and Other Developmental Disabilities, Vol. 20, No. 1, 2-9 (2005)
DOI: 10.1177/10883576050200010101
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