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Processing Speed Index Subtest of the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV)
Please visit this website for more information about the instrument:  

Basic: Acute, Moderate and Mild Traumatic Brain Injury (TBI)
Supplemental: Epidemiology TBI

Short Description of Instrument
Publication Date: 2008
Ages/Grades: Individuals 16-90 years
Scores: VIQ, PIQ, and FSIQ scores
This index is based on 2 subtests of the Wechsler Adult Intelligence Scale. For Digit Symbol, examinee must accurately fill in symbols, according to matched number-symbol pairs in a key in 120 seconds. For Symbol Search, examinee determines whether either of two target symbols match any of the symbols in a search group; examinee must respond to as many items as able in 120 seconds.
The 2 subtests yield scaled scores adjusted for age with a mean of 10 and standard deviation of 3. The WAIS PS Index is based on the 2 subtests with a mean of 100 and standard deviation of 15 adjusted for age.
Requires trained examiner to administer and neuropsychologist or psychologist to interpret. Administration time is 10 minutes.
This is a performance based measure which requires the subject to understand what is required and participate in the testing. It requires a functional level in the severe disability or above on the GOS/GOSE.
Good psychometric properties. Sensitive to TBI and its severity. Legacy measure for NIH Toolbox Processing Speed Subdomain.

Wechsler Adult Intelligence Scale III/IV. Processing Speed Index. Pearson Education Inc, San Antonio, Texas.


Document last updated June 2019