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Processing Speed Index Subtest of the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV)
Availability
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Classification
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
Comments
DESCRIPTION
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.
PERMISSIBLE VALUES
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.
PROCEDURES
Requires trained examiner to administer and neuropsychologist or psychologist to interpret. Administration time is 10 minutes.
COMMENTS
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.
RATIONALE
Good psychometric properties. Sensitive to TBI and its severity. Legacy measure for NIH Toolbox Processing Speed Subdomain.
 
References
Wechsler Adult Intelligence Scale III/IV. Processing Speed Index. Pearson Education Inc, San Antonio, Texas.
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