Cognitive functioning in adults with autism spectrum disorder.

This study looked at thinking skills in 40 autistic adults. While their IQ scores were lower than the general population in all areas tested, they were still in the normal range. The adults showed better verbal skills than non-verbal skills. Interestingly, their thinking abilities weren't related to how severe their autism symptoms were, suggesting these are separate aspects of being autistic.

This cross-sectional study examined cognitive functioning in 40 adults with autism spectrum disorder referred to an Australian developmental disorders clinic (2021-2022). Using standardized assessments including the Stanford-Binet Intelligence Scale, researchers found that autistic adults demonstrated significantly lower IQ scores across all cognitive domains compared to the general population, though mean scores remained within normal ranges. Participants showed relative strengths in verbal knowledge compared to non-verbal knowledge. Notably, no significant correlations were found between IQ measures and autism symptom severity scales (AQ, RAADS-R, SRS), suggesting cognitive abilities may be independent of measured autism characteristics in this clinical sample.

Results suggest autistic adults may have distinct cognitive profiles with relative strengths in verbal domains. Cognitive assessment should be routine in adult autism services. The independence of IQ from autism symptom measures indicates need for comprehensive evaluation addressing both cognitive abilities and autism-specific support needs.

Small sample size (n=40) from single clinical setting limits generalizability. Cross-sectional design prevents understanding of developmental trajectories. Study lacks control group comparison and doesn't account for potential confounding factors like medication or comorbidities.

Neuropsychological deficits in areas of Executive Functioning (EF), theory of mind, and central coherence have been well-documented among children and adolescents with autism spectrum disorder (ASD); however, there remains a significant gap in knowledge with regards to neuropsychological profile in adults with ASD. This study aims to investigate the intellectual functioning and neuropsychological profiles of a clinical population of adults with ASD. This cross-sectional study included 40 available autistic individuals referred to an adult developmental disorders clinic at a hospital between 2021 and 2022. All participants were assessed using the Stanford-Binet Intelligence Scale (SBIS), Autism Spectrum Quotient (AQ), Ritvo Autism Asperger Diagnostic Scale-Revised (RAADS-R), and Social Responsiveness Scale (SRS).

Individuals with ASD exhibited lower IQ scores across all domains of the Stanford-Binet Intelligence Scale, compared to the general population, although the mean IQ scores remained within the normal range. Significant differences were observed in Full Scale IQ, Verbal IQ, Non-Verbal IQ, Fluid Reasoning, Knowledge, Quantitative Reasoning, Visual-Spatial Processing, and Working Memory compared to the general population. Additionally, autistic individuals' performance on verbal knowledge was higher compared to non-verbal knowledge. No significant correlations were found between the total and subscale scores of verbal and nonverbal IQ and AQ, RAADS-R, and SRS scores.

Considering the significant impacts of cognitive and executive function on the social and occupational aspects of autistic adults, further investigations in this area are warranted.