Kaliuzhna Mariia, Stein Timo, Sterzer Philipp, Seymour Kiley J
Clinical and Experimental Psychopathology Group, Department of Psychiatry, University of Geneva, Switzerland.
Department of Psychology, University of Amsterdam, Netherlands.
Schizophr Res Cogn. 2019 Oct 31;19:100165. doi: 10.1016/j.scog.2019.100165. eCollection 2020 Mar.
Research on visual perception in schizophrenia suggests a deficit in motion processing. Specifically, difficulties with discriminating motion speed are commonly reported. However, speed discrimination tasks typically require participants to make judgments about the difference between two stimuli in a two-interval forced choice (2IFC) task. Such tasks not only tap into speed processing mechanisms, but also rely on higher executive functioning including working memory and attention which has been shown to be compromised in schizophrenia. We used the Flash Lag illusion to examine speed processing in patients with schizophrenia. Based on previous research showing a strong dependence between motion speed and the illusion magnitude, we expected a deficit in speed processing to alter this relationship. A motion processing deficit in patients would also predict overall reductions in perceived lag. We found the magnitude and speed dependence of the Flash Lag illusion to be similar in patients and controls. Together, the findings suggest no general abnormality in motion speed processing in schizophrenia.
对精神分裂症视觉感知的研究表明，其在运动处理方面存在缺陷。具体而言，人们普遍报告在辨别运动速度方面存在困难。然而，速度辨别任务通常要求参与者在二间隔强制选择（2IFC）任务中对两个刺激之间的差异做出判断。此类任务不仅涉及速度处理机制，还依赖于更高层次的执行功能，包括工作记忆和注意力，而这些功能在精神分裂症中已被证明受到损害。我们使用闪光滞后错觉来研究精神分裂症患者的速度处理。基于先前的研究表明运动速度与错觉大小之间存在强烈依赖关系，我们预计速度处理缺陷会改变这种关系。患者的运动处理缺陷也会预测感知滞后的总体减少。我们发现闪光滞后错觉的大小和速度依赖性在患者和对照组中相似。总之，研究结果表明精神分裂症患者在运动速度处理方面没有普遍异常。
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