Cross-Validation of a Manual form of the Letter Memory Test Using a Known-Groups Methodology

A manual form of the Letter Memory Test (LMT: Orey, Cragar, & Berry, 2000 Orey , S. A. , Cragar , D. E. , & Berry , D. T. R. ( 2000 ). The effects of two motivational manipulations on the neuropsychological performance of mildly head-injured college students . Archives of Clinical Neuropsychology , 15 , 335 – 348 .Crossref], PubMed], Web of Science ®] , Google Scholar]) was compared in neuropsychological evaluees classified as honest (HON: n = 39) or probable cognitive feigners (PCF: n = 10) using results from two well-validated motivational tests. With the exception of lower educational level and higher rate of compensation seeking in the PCF, the groups were equivalent on most important demographic and injury severity parameters. PCF participants scored significantly lower on most neuropsychological tests (median Cohen's d = 1.2), as well as on the manual LMT (Cohen's d = 4.2). Operating characteristics of the manual LMT in the present sample were comparable to those reported in a similar study using the computerized version of the LMT in neuropsychiatric patients (Vagnini et al., 2006 Vagnini , V. L. , Sollman , M. J. , Berry , D. T. R. , Granacher , R. P. , Clark , J. A. , et al. . ( 2006 ). Known-groups cross-validation of the Letter Memory Test in a sample of compensation-seeking mixed neurologic sample . The Clinical Neuropsychologist , 20 , 289 – 304 .Taylor & Francis Online], Web of Science ®] , Google Scholar]).