An investigation on the association of cognitive information processing within the process of perceptual-motor process by analyzing the cortical root of perceptual information transmission

为了理解实现特定运动任务目标的机制，了解知觉信息如何在组织动作的过程中发挥作用是至关重要的。这项研究考察了两种知觉-运动任务：1)到达视觉目标并用捏把抓住它，2)估计视觉目标的大小并用捏握的孔径产生估计的大小。这些任务动作是关于一个简单的圆形物体以及被其他五个圆形包围的同一圆形物体产生的，由此产生了Ebbinghaus错觉，从而考察了认知信息加工与视觉运动组织过程的关联。为此，使用脑电来分析任务执行过程中的大脑皮层激活模式。10名受试者自愿完成触握和匹配任务，他们的大脑皮层活动由通道脑电记录系统与…共同记录更多的是夹持运动的关节偏移量。从事件相关同步或去同步(ERS/ERD)的角度对EEG的频域进行分析，将其分别视为皮层兴奋和失活/抑制。对于两个知觉-运动任务，目标物体的相同视觉刺激产生了相同的手指关节运动。在皮层部位(视觉区域和躯体感觉运动区)观察到的ERS反映了这一点，该区域与处理视觉信息和产生动作有关。此外，在到达-抓取任务中观察到了枕顶区的ERS。根据背侧视流和腹侧视流的假说，匹配任务的执行不涉及到达-抓取任务，而是关于目标物体大小估计的认知信息加工。因此，触达-掌握任务中的ERS暗示了与认知活动相关的抑制信息加工的大脑皮层过程。2007年8月，在巴西桑托斯举行的运动控制领域的国际会议上报告了本研究的结果，并将论文提交给了一份关于运动控制和脑电研究的国际期刊。较少

For understanding the mechanism of achieving a given motor task goal, it is critical to know how perceptual information plays a role in the process of organizing a movement. The present study investigated two perceptual-motor tasks: 1) reaching to a visual target and grasping it with a pinch grip, and 2) estimating the size of the visual target and producing the estimated size with the aperture of a pinch grip. These task movements were produced with respect to a simple circular object as well as to the same circular object surrounded by other five circles, which induces the Ebbinghaus illusion, and thereby the association of cognitive information processing with the visuo-motor organization process was examined. To this end, EEG was used to analyze the cortical activation pattern during the task execution. Ten participants volunteered and performed the reaching-grasping and the matching tasks, and their cortical activities were recoded by a 64-channel EEG recording system together wit … More h the joint excursions of the pinch grip motion by a Goniometer. The frequency domain of EEG was analyzed in terms of event-related synchronization or desynchronization (ERS/ERD), which are regarded as the cortical excitation and deactivation/inhibition respectively. For both of the two perceptual-motor tasks, the same 'finger joint motion was produced with respect t to the same visual stimulus of the target object. This was reflected by ERS observed in the cortical sites (the visual area and the somatosensory-motor areas), which associate with processing visual information and producing movements. Furthermore, ERS in the occipito-parietal area was observed in the reaching-grasping task. According to the hypothesis of the two visual streams, the dorsal and the ventral streams, cognitive information processing about estimating the size of the target object was involved in the execution of the matching task as opposed to the reaching-grasping task. Therefore the ERS in the reaching-grasping task imply the cortical process of inhibiting information processing associated with the cognitive activity. The findings in the present study was reported at the international conference in the field of motor control in Santos, Brazil, held in August, 2007, and the paper was submitted to an international journal on studies on motor control and EEG. Less