Cheng Darian T, Tremblay Luc, Fjeld Krista, Krigolson Olave E, Binsted Gordon
Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, Canada.
Evoked Potential Operant Conditioning Laboratory, Medical University of South Carolina, Charleston, USA.
Exp Brain Res. 2025 Mar 16;243(4):93. doi: 10.1007/s00221-025-07043-6.
In the current study, electroencephalographic (EEG) data was recorded to study the impact of hand and target visibility on neural processing during both the planning and execution of upper limb reaches. Prior to each movement, participants were informed if the hand and/or the target would be available in four conditions: (1) hand and target visible, (2) hand only, (3) target only, and (4) no hand, no target. Visual evoked potentials (VEPs) were assessed after target onset (i.e., prior to the reaching movement: P2), which revealed larger positive components when vision of the target was not going to be available during the reaching movement (i.e., hand only, no hand-no target) compared to when the target would be present (i.e., hand and target, target only). Further, the motor-related evoked potentials (MEPs) observed in relation to the reaching movement onset showed that a second negative peak generated during the execution of the reaching movement was significantly greater for reaches without vision of the hand, as compared to reaches with vision of the hand. Our results indicate a sequential importance of seeing the target and the hand, prior-to and during the movement, respectively. This work provides neurophysiological evidence to better understand the utilization of vision of the hand and target during goal-directed reaching.
在当前研究中，记录了脑电图（EEG）数据，以研究上肢伸展动作的计划和执行过程中手部和目标可见性对神经处理的影响。在每次动作之前，告知参与者手部和/或目标在四种情况下是否可用：（1）手部和目标可见；（2）仅手部可见；（3）仅目标可见；（4）手部和目标均不可见。在目标出现后（即到达动作之前：P2）评估视觉诱发电位（VEP），结果显示，与目标存在时（即手部和目标可见、仅目标可见）相比，在到达动作过程中目标不可见时（即仅手部可见、手部和目标均不可见），正向成分更大。此外，与到达动作开始相关的运动相关诱发电位（MEP）表明，在执行到达动作过程中产生的第二个负向峰值，在无手部视觉的到达动作中比有手部视觉的到达动作中显著更大。我们的结果表明，在动作之前和动作过程中，看到目标和手部具有先后顺序的重要性。这项工作提供了神经生理学证据，以更好地理解在目标导向的伸手动作中手部和目标视觉的利用情况。
