746 Abstracts from the 19th Annual Meeting were the controls, while controlling for total word recall. Within subject analyses reflect that there is not a word po.sition effect, but that simulators are more likely to say "COF- FEE" than "PRETEND" when in the 4th position. In contrast, percentage recall of these words is the same for controls. Further, controls are significantly more likely to recall the word "PRETEND" versus "COLOR," whereas simulators show no difference, again re- flecting suppression of "PRETEND" recall. Additional analyses and attempts to detect simulators are conducted. These results warrant further investigation into the utility of this response suppression effect in detecting malingering and whether it may offer addi- tional discriminative power when combined with other malingering detection strategies. Twamley, E. W., Blackwood, H. D., & Summers, J. D. Is Cooperation Testing Necessary? An Archival Study of Variables Associated With Test- Taking Effort. Assessment of patients' test-taking effort or cooperation is an essential component of neu- ropsychological evaluation because it supports statements regarding the validity of test results. Cooperation tests are often used to assess test-taking effort, but their utility has been questioned. We evaluated the role of cooperation testing in 110 randomly selected private practice neuropsychological evaluations. The sample was 43% male and averaged 39 years of age and 13.6 years of education. Two experienced neuropsychologists pro- vided independent ratings of each patient's level of test-taking effort based on two sepa- rate sets of information: (a) scores on three cooperation tests (Rey 15 Item Test, Rey Dot- Counting Test, and CogniSyst Word Memory Test), and (b) an evaluation summary packet, including selected data from record review (e.g., loss of consciousness and pres- ence of statements regarding non-neurogenic factors in symptom presentation), patient interview (e.g., employment history and presenting cognitive, emotional, and physical com- plaints), neuropsychological test results, and MMPI-2 profile. Raters were blind to iden- tifying information and rated cooperation data and evaluation summary data separately. These ratings were then compared to ultimate clinical judgments of test-taking effort as presented in the written reports of the neuropsychological evaluations. Of 110 cases, 14 were ultimately judged to have produced invalid and uninterpretable test results due to poor test-taking effort, and 39 were judged to have produced test results that were inter- pretable, but clouded by nonneurogenic factors. Regression analyses indicated that clini- cian ratings of evaluation summary packets provided better prediction of ultimate clinical judgment regarding cooperation (R 2 = .33) than did clinician ratings of cooperation test scores (R 2 = .28). Hierarchical multiple regression analyses revealed that patients' coop- eration test performance was about as good a predictor of ultimate judgment of test-taking effort as record review data alone (R 2 = .55 and .58, respectively). However, record re- view data coupled with either interview data or MMPI-2 data predicted 100% of the vari- ance in ultimate judgment of test-taking effort. These findings suggest that cooperation testing does not provide unique information in the context of a complete neuropsycholog- ical evaluation and may be unnecessary in some cases. Development and clinical use of empirically based algorithms for interpreting patients' historical data, neuropsychologi- cal test performance, and personality inventory profiles could augment clinical judgment regarding test-taking effort while simultaneously reducing reliance on cooperation tests. Gervais, R., Green, P., & Allen, L. Differential Sensitivity to Symptom Exaggeration of Verbal Visual and Numerical Symp- tom Validity Tests. In detecting suboptimal effort and potential exaggeration of cognitive impairment, digit recognition procedures have been the most widely employed. However, it cannot be as- Downloaded from https://academic.oup.com/acn/article-abstract/14/8/746/4972 by guest on 21 May 2020