Verbal fluency in adults with high functioning autism or Asperger syndrome

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Autism Spectrum Disorder (ASD) encompasses a range of neurodevelopmental conditions.
• Individuals with ASD often exhibit differences in cognitive processing, including verbal abilities.
• Understanding specific deficits in verbal fluency is crucial for targeted interventions.

Purpose of the Study:

• To compare semantic and phonemic fluency performance in adults with High Functioning Autism (HFA), Asperger syndrome, and neurotypical controls.
• To investigate potential underlying reasons for observed fluency differences, such as strategy use and processing speed.
• To elucidate the distinct verbal fluency profiles associated with HFA and Asperger syndrome.

Main Methods:

• Participants with HFA, Asperger syndrome, and neurotypical controls were matched for age and verbal ability.
• Semantic fluency tasks (e.g., naming items in a category) were administered.
• Phonemic fluency tasks (e.g., naming words starting with a specific letter) were performed.

Main Results:

• High Functioning Autism (HFA) group showed significant impairments in both semantic and phonemic fluency (letter M).
• Asperger syndrome group exhibited deficits solely in the 'professions' semantic fluency task.
• Fluency deficits were not linked to strategy use or switching difficulties but were associated with lower processing speed in the HFA group.

Conclusions:

• Adults with HFA exhibit broader verbal fluency impairments compared to those with Asperger syndrome.
• Social components of certain tasks may disproportionately affect individuals with ASD.
• Processing speed appears to be a significant factor contributing to verbal fluency deficits in HFA.