Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/23039
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Type: Journal article
Title: Does effort suppress cognition after traumatic brain injury? A re-examination of the evidence for the Word Memory Test
Author: Bowden, S.
Shores, E.
Mathias, J.
Citation: Neuropsychology, Development and Cognition. Section D: The Clinical Neuropsychologist, 2006; 20(4):858-872
Publisher: Swets Zeitlinger Publishers
Issue Date: 2006
ISSN: 1385-4046
1744-4144
Statement of
Responsibility: 
Stephen C. Bowden, E. Arthur Shores, Jane L. Mathias
Abstract: Green, Rohling, Lees-Haley, and Allen (2001) suggested that scores on a test of "effort," the Word Memory Test (WMT), explains more variance in outcome after brain injury than does injury severity. As a consequence, Green and colleagues recommend using the WMT to control for sub-optimal effort in neuropsychological evaluations and group research. We re-examine the evidence for their conclusions and argue that identifying a larger proportion of explained variance is not in itself evidence of validity unless the premise to be proven is already assumed, namely, that the test is a valid measure of effort. Instead, the crux of Green and colleagues claim for the validity of the WMT implies an interaction between effort and injury severity on outcome scores, although the specific interaction has not been tested in their previous research. We failed to find any evidence for this interaction in a sample of 100 Australian litigants. We conclude that our data do not support the view that effort, as measured by the WMT, interacts with injury severity to suppress cognition after brain injury.
Keywords: Humans; Brain Injuries; Disability Evaluation; Reproducibility of Results; Cognition; Memory, Short-Term; Reaction Time; Neuropsychological Tests; Adolescent; Adult; Aged; Middle Aged; Child; Female; Male; Physical Exertion
Description: Copyright © 2006 Taylor and Francis Group
RMID: 0020061277
DOI: 10.1080/13854040500246935
Appears in Collections:Psychology publications

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