用认知伪装甄别测验探测模拟认知损害

The Detection of Simulated Cognitive Impairment with the CMST

目的:评价认知伪装甄别测验探测模拟认知损害的有效性。方法:模拟组40名健康成人在测验中伪装有认知损害,对照组40名健康成人要求尽最大能力完成测验。结果:模拟组的测验成绩比对照组低1-2个标准差(P<0.001)。按四种评判标准判断,对照组所有被试均被判为真诚,特异性100%,而模拟组的阳性命中率分别为82.5%(得分模式)、77.5%(最低分)、52.5%(划界分)和37.5%(概率分),加权敏感性分别为90.0%、87.5%、71.25%和50%。判别分析显示6指标组合或分测验分的归类正确率均为97.5%。结论:认知伪装甄别测验对模拟伪装具有较好甄别能力。

Objective： To evaluate effect of Cognitive Malingering Screening Test （CMST） used to detect simulated cognitive impairment. Methods： Forty normal adults （Simulative group） completed the CMST under instructions to malinger having cognitive impairment and 40 normal subjects （Control group） completed the CMST under instructions to try their best. Results： The average performance of simulative group was 1.0-2.0 standard deviations worse than that of control group. According to four judgment standards, all subjects in the control group were classified as honest, with specificity of 100%, while positive hit rate of the simulative group was 82.5%（performance model）, 77.5% （the lowest performance ）, 52.5%（ cut-off score）, and 37.5% （chance level） , with weighed sensitivity of 90.0%, 87.5%, 71.25% and 50% respectively. Discriminant function analyses using the two scores or six scores derived from the CMST as predictors of group membership both resulted in a 97.5% correct classification rate. Conclusion： The CMST continues to show promise as a measure of detecting malingering cognitive impairment.