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Letter-Number Sequencing Subtest
Availability
Please visit this website for more information about the instrument: Letter-Number Sequencing Subtest of the Wechsler Adult Intelligence Scale-Fourth Edition
Classification
Supplemental: Traumatic Brain Disease (TBI)
Short Description of Instrument
Publication Date: 2008
 
Description:
This is a complex span task involving simultaneous processing. The subject is presented with a mixed list of numbers and letters and their task is to repeat the list by saying the numbers first in ascending order and then the letters in alphabetical order.
 
Ages/Grades: Individuals 16-90 years
 
Scores: VIQ, PIQ, and FSIQ scores
Scoring
PERMISSIBLE VALUES
Performance on this measure is converted to scaled scores with a mean of 10 and standard deviation of 3. The scaled score is adjusted for age.
 
PROCEDURES
Requires trained examiner to administer. Administration time is 5 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
Highest factor analytic loading on Working Memory factor. Good psychometric properties and sensitivity to severity of TBI. Legacy measure for the NIH Toolbox Working Memory Subdomain.
References
Wechsler Adult Intelligence Scale III. Letter-Number Sequencing Subtest. Pearson Education Inc, San Antonio, Texas.
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