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Letter-Number Sequencing Subtest
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
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| Classification |
NeuroRehab Supplemental - Highly Recommended
Recommendations for Use: Indicated for studies requiring a measure for attention/working memory.
Supplemental: Traumatic Brain Disease (TBI)
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| 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: Letter-Number Sequencing yields raw and scaled scores.
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| Scoring and Psychometric Properties |
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 List Sorting subtest within the Working Memory Subdomain.
Psychometric Properties:
Split-half reliability = 0.88; test-retest reliability = 0.80
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| 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.
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| Rationale/Justification |
Strengths: Part of well-validated WAIS-IV, brief to administer, classic working memory paradigm. Broad utility, comprehensive norms and applicability across many different populations that are common in rehabilitation.
Weaknesses: Not part of core WAIS battery in version IV. This subtest is part of a battery that requires a purchase of the entire program to use. Validated alternate forms are not available to mitigate practice effects with serial testing.
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| References |
Lichtenberger EO & Kaufman AS. (2012). Essentials of WAIS-IV assessment (Vol. 96). John Wiley & Sons.
Wechsler Adult Intelligence Scale III. Letter-Number Sequencing Subtest. Pearson Education Inc, San Antonio, TX.
Wechsler Adult Intelligence Scale IV. (2008). Letter-Number Sequencing Subtest. Pearson, San Antonio, TX.
Document last updated January 2022
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