Rund B R, Landrø N I, Orbeck A L
Child Psychiatric Clinic, University of Oslo, Norway.
J Nerv Ment Dis. 1993 Apr;181(4):233-7. doi: 10.1097/00005053-199304000-00004.
The purpose of the present longitudinal study was to investigate the stability of backward masking performance in schizophrenics and nonschizophrenic psychotic patients. Twenty-two schizophrenics, eight nonschizophrenics, and 14 normal controls were tested three times, with an interval of 1 year between each test session. A standard stimulus duration procedure was used. The relative onset intervals between the target and the mask was 16.5 msec or 33 msec. A no mask condition was presented before the two masking conditions. Results showed that masking performance is a stable phenomenon, for both psychiatric groups and for normal controls. Significant differences were found between schizophrenics and the normal controls, but not between the two psychiatric groups. Vulnerability to masking stimuli as a specific characteristic for schizophrenics is, thus, not supported in the present study. The results suggest that backward masking deficit is an enduring feature of psychotic disturbances.
本纵向研究的目的是调查精神分裂症患者和非精神分裂症精神病患者反向掩蔽表现的稳定性。22名精神分裂症患者、8名非精神分裂症患者和14名正常对照者接受了三次测试，每次测试之间间隔1年。采用了标准刺激持续时间程序。目标刺激和掩蔽刺激之间的相对起始间隔为16.5毫秒或33毫秒。在两种掩蔽条件之前呈现无掩蔽条件。结果表明，对于精神疾病组和正常对照组而言，掩蔽表现都是一种稳定的现象。精神分裂症患者与正常对照组之间存在显著差异，但两个精神疾病组之间没有差异。因此，本研究不支持将对掩蔽刺激的易感性作为精神分裂症患者的一个特定特征。结果表明，反向掩蔽缺陷是精神障碍的一个持久特征。
