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A study of intellectual abilities in high-functioning people with autism
A J Lincoln1, E Courchesne, B A Kilman
1Neuropsychology Research Laboratory, Children's Hospital Research Center, San Diego, California.
Journal of Autism and Developmental Disorders
|December 1, 1988
Summary
This study found distinct differences in verbal versus visual-motor intellectual functioning in individuals with autism. Autistic children also showed significantly different intellectual abilities compared to other developmental disorders.
Area of Science:
- Neurodevelopmental Disorders
- Cognitive Psychology
- Psychometrics
Background:
- Previous research has explored the intellectual functioning of individuals with autism using standardized intelligence tests.
- Understanding cognitive profiles in autism is crucial for targeted interventions and support.
- The Wechsler scales (WAIS-R, WISC-R) are commonly used to assess intellectual abilities.
Purpose of the Study:
- To investigate the specific patterns of intellectual functioning in individuals diagnosed with autism.
- To differentiate verbal and visual-motor intellectual abilities in autistic individuals.
- To compare the intellectual profiles of autistic children with those of children having other developmental disorders.
Main Methods:
- Study I: Assessed 33 individuals meeting DSM-III criteria for autism using Wechsler Adult Intelligence Scale-Revised (WAIS-R) and Wechsler Intelligence Scale for Children-Revised (WISC-R).
- Principal components analysis was employed to examine interrelationships among measured intellectual abilities.
- Study II: Compared intellectual abilities of autistic children (8-12 years) with age-matched children diagnosed with receptive developmental language disorder, dysthymic disorder, or oppositional disorder.
Main Results:
- Clear evidence emerged differentiating verbal intellectual processes from visual-motor abilities in the autistic individuals studied.
- Principal components analysis revealed distinct patterns in the interrelationships of intellectual abilities.
- Autistic children exhibited significantly different intellectual abilities when compared to children with receptive developmental language disorder, dysthymic disorder, or oppositional disorder.
Conclusions:
- Autism is associated with a specific profile of intellectual functioning, marked by differences between verbal and visual-motor skills.
- The cognitive profile of autistic individuals differs significantly from other neurodevelopmental and behavioral disorders.
- These findings underscore the heterogeneity of cognitive abilities within autism spectrum disorder and in comparison to other conditions.