Encyclopedia of Autism Spectrum Disorders

2013 Edition
| Editors: Fred R. Volkmar

Processing Speed Index

  • Timothy Soto
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-1698-3_246

Synonyms

Definition

Processing speed refers to the speed of cognitive processes and response output. The Processing Speed Index (PSI) is one of four indices that make up the full scale intelligence quotient (FSIQ) derived from The Wechsler Adult Intelligence Scale-4th edition (WAIS-IV) and The Wechsler Intelligence Scale for Children-4th edition (WISC-IV), primary standardized clinical instruments used to measure intelligence. The tasks included in the scales that comprise the PSI, (Coding, Symbol Search), are timed and require attending to visual material, visual perception and organization, visual scanning, and hand-eye coordination. Performance on the Coding subtest also requires paired associative learning. Anxiety and fine motor problems may interfere with performance on the PSI. Coding, in particular, which requires copying simple shapes, may be affected by motor output problems. This tends to be an area of relative weakness for children with ASD...

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References and Readings

  1. Brock, J., Xu, J. Y., & Brooks, K. R. (2011). Individual differences in visual search: Relationship to autistic traits, discrimination thresholds, and speed of processing. Perception, 40(6), 739–742.PubMedGoogle Scholar
  2. Calhoun, S. L., & Mayes, S. D. (2005). Processing speed in children with clinical disorders. Psychology in the School, 42(4), 333–343.Google Scholar
  3. Faja, S., Webb, S. J., Merkle, K., Aylward, E., & Dawson, G. (2008). Brief report: Face configuration accuracy and processing speed among adults with high-functioning Autism spectrum disorders. Journal of Autism and Developmental Disorders, 39, 532–538.PubMedGoogle Scholar
  4. Mayes, S. D., & Calhoun, S. L. (2008). WISC-IV and WIAT-II profiles in children with high-functioning Autism. Journal of Autism and Developmental Disorders, 38, 428–439.PubMedGoogle Scholar
  5. Scheuffgen, K., Happe, F., Anderson, M., & Frith, U. (2000). High “intelligence,” low “IQ” Speed of processing and measured IQ in children with Autism. Development and Psychopathology, 12, 83–90.PubMedGoogle Scholar
  6. Wallace, G. L., Anderson, M., & Happe, F. (2009). Brief report: Information processing speed is intact in Autism but not correlated with measured intelligence. Journal of Autism and Developmental Disorders, 39, 809–814.PubMedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Clinical PsychologyUniversity of Massachusetts BostonBostonUSA