Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Processing Speed Index

  • Rael T. LangeEmail author
  • Sara M. Lippa
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1322


PSI; Processing Speed Quotient (WPSSI-III); Processing Speed Scale (WAIS-IV)


A score derived from administration of selected subtests from the third and fourth edition Wechsler Intelligence Scales designed to provide a measure of a person’s ability to process visually presented information quickly.

Current Knowledge

Wechsler Intelligence Scales (WIS): The WIS family of tests is some of the most widely used test batteries to assess general intellectual ability in adults aged 16 years or older (Wechsler Adult Intelligence Scale (WAIS)), children aged 6–16 years (Wechsler Intelligence Scale for Children (WISC)), and children aged 2–7 years (Wechsler Preschool and Primary Scale of Intelligence (WPPSI)). Since the original development of these tests (WAIS 1955; WISC 1949; WPPSI 1967), all three batteries have been revised on several occasions. The most recent revisions were published in 2012 (WPPSI-IV), 2014 (WISC-V), and 2008 (WAIS-IV).

History: Originally, one of the...

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Further Readings

  1. Atkinson, L. (1991). Some tables for statistically based interpretation of WAIS-R factor scores. Psychological Assessment, 3(2), 288–291.CrossRefGoogle Scholar
  2. Kaufman, A. S., & Lichtenberger, E. O. (2006). Assessing adolescent and adult intelligence (3rd ed.). Hoboken: Wiley.Google Scholar
  3. Sattler, J. M. (2008). Assessment of children: Cognitive foundations (5th ed.). San Diego: Author.Google Scholar
  4. Tulsky, D. S., Saklofske, D. H., & Zhu, J. (2003). Revising a standard: An evaluation of the origin and development of the WAIS-III. In D. S. Tulsky et al. (Eds.), Clinical interpretation of the WAIS-III and WMS-III (pp. 43–92). San Diego: Academic.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Defense and Veterans Brain Injury CenterWalter Reed National Military Medical CenterBethesdaUSA