Imagined motor action and eye movements in schizophrenia
Imagined motor action and eye movements in schizophrenia
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DOI：
10.3389/fpsyg.2013.00426
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发表时间：
2013-07-12
影响因子：
3.8
通讯作者：
Boucart, Muriel
中科院分区：
文献类型：
--
作者：
Delerue, Celine;Boucart, Muriel
据报道，精神分裂症患者的视觉探索和行动计划异常。大多数精神分裂症患者眼动监测的研究都是在自由观看条件下进行的。本研究旨在评估精神分裂症患者和健康对照者在心理上执行一个动作是否会调节视觉行为。对18例精神分裂症患者和18名健康对照者的视觉扫描路径进行了监测。参与者被要求执行两项任务：（1）在计算机屏幕上观看场景（自由观看），或（2）想象自己在计算机屏幕前制作三明治（主动观看）。这些场景包含任务相关和任务无关的对象。比较各组和各任务的扫描路径的时间和空间特征。结果表明，精神分裂症患者表现出更长的注视时间，和更少的注视，比健康对照组在自由观看条件。在主动观察状态下，患者的视觉探索得到改善。然而，在主动观察条件下，患者较少关注任务相关物体，而更多地关注干扰物，在主动观察条件下，他们被要求想象自己在移动眼睛以任务相关物体的图像中制作三明治。这些结果与精神分裂症患者运动想象缺陷的文献是一致的，它扩展了动作想象任务中的视觉探索障碍。
Visual exploration and planning of actions are reported to be abnormal in schizophrenia. Most of the studies monitoring eye movements in patients with schizophrenia have been performed under free viewing condition. The present study was designed to assess whether mentally performing an action modulates the visuomotor behavior in patients with schizophrenia and in healthy controls. Visual scan paths were monitored in eighteen patients with schizophrenia and in eighteen healthy controls. Participants performed two tasks in which they were asked either to (1) look at a scene on a computer screen (free viewing), or (2) picture themselves making a sandwich in front of a computer screen (active viewing). The scenes contained both task-relevant and task-irrelevant objects. Temporal and spatial characteristics of scan paths were compared for each group and each task. The results indicate that patients with schizophrenia exhibited longer fixation durations, and fewer fixations, than healthy controls in the free viewing condition. The patients' visual exploration improved in the active viewing condition. However, patients looked less at task-relevant objects and looked more at distractors than controls in the active viewing condition in which they were asked to picture themselves making a sandwich in moving their eyes to task relevant objects on an image. These results are consistent with the literature on deficits in motor imagery in patients with schizophrenia and it extends the impairment to visual exploration in an action imagery task.