Mannuzza S, Kietzman M L, Berenhaus I J, Ramsey P H, Zubin J, Sutton S
Biol Psychiatry. 1984 Sep;19(9):1317-31.
We investigated whether the disproportionate slowing of schizophrenic patients on cross-modal relative to ipsimodal sequences in a reaction time task ("modality shift effect") could be attributed to a psychometric artifact, as implied by Chapman and Chapman. Fifteen schizophrenic patients (Research Diagnostic Criteria) and 50 normal controls with no current or past history of psychiatric disorder were tested. Subjects made an identical finger-lift response to brief duration light and sound stimuli of different intensities presented in quasi-random order. The major finding was that psychometric artifact could not account for the disproportionate slowing of the reaction time of schizophrenic patients since the reliabilities and variances of the cross-modal and ipsimodal conditions did not differ in normal controls. Furthermore, the modality shift effect was highly significant for reaction times to both sound and light and for all intensities. Findings were the same when the schizophrenic patients were compared to a matched subgroup of slow-responding normal controls.
我们研究了精神分裂症患者在反应时间任务中，相对于同侧模式序列，跨模式序列的不成比例的反应迟缓（“模式转换效应”）是否如查普曼夫妇所暗示的那样，可归因于心理测量误差。我们测试了15名精神分裂症患者（研究诊断标准）和50名无当前或既往精神疾病史的正常对照者。受试者对以准随机顺序呈现的不同强度的短暂光和声刺激做出相同的手指抬起反应。主要发现是，心理测量误差无法解释精神分裂症患者反应时间的不成比例的迟缓，因为在正常对照者中，跨模式和同侧模式条件下的信度和方差并无差异。此外，对于声音和光的反应时间以及所有强度而言，模式转换效应都非常显著。当将精神分裂症患者与反应迟缓的正常对照者的匹配亚组进行比较时，结果相同。
