Katsumata H, Suzuki K, Tanaka T, Imanaka K
Department of Sports and Health Science, Daito-Bunka University, 560 Iwadono, Higashi-Matsuyama, Saitama 355-0065, Japan.
Clin Neurophysiol. 2009 Mar;120(3):484-96. doi: 10.1016/j.clinph.2008.11.024. Epub 2009 Jan 10.
For motor activities, visual information is crucial for organizing a movement with respect to a given situation. The present study investigates how cognitive information processing is associated with this visuomotor process.
Brain dynamics in executing two perceptual-motor tasks were examined in terms of event-related synchronization (ERS) and event-related desynchronization (ERD) of EEG. Those tasks were (1) reaching toward and grasping a visual object with a pinch grip, and (2) matching the pinch grip size with respect to the perceived object size.
According to the aperture size in the task execution, both the tasks were affected by the perceived object size inducing the Ebbinghaus illusion. The alpha-ERD patterns were associated with the movement execution and appeared to be identical in both the tasks, whilst the gamma-ERS appeared only for the grasping motion.
These results suggest that cognitive processing was involved not only in the matching task but also in the grasping task. These ERD/ERS patterns are thought to reflect the similarity and difference in the perceptual-motor processes between the two tasks.
The analysis of ERD/ERS can provide insight on the qualitative feature in a visuomotor process associated with the involvement of cognitive processing.
对于运动活动而言，视觉信息对于根据特定情境组织运动至关重要。本研究探讨认知信息处理如何与这种视觉运动过程相关联。
根据脑电图的事件相关同步（ERS）和事件相关去同步（ERD），研究执行两项感知运动任务时的脑动力学。这些任务分别是：（1）用捏握方式伸手抓取一个视觉物体；（2）根据感知到的物体大小匹配捏握的大小。
根据任务执行中的孔径大小，两项任务均受感知到的物体大小影响，进而产生埃宾浩斯错觉。α-ERD模式与运动执行相关，且在两项任务中似乎相同，而γ-ERS仅在抓握动作时出现。
这些结果表明，认知处理不仅涉及匹配任务，还涉及抓握任务。这些ERD/ERS模式被认为反映了两项任务在感知运动过程中的异同。
对ERD/ERS的分析可以为与认知处理参与相关的视觉运动过程的定性特征提供见解。
