Attention‐dependent switching between intrinsic‐muscle and extrinsic‐visual coordinates during bimanual movements
Attention‐dependent switching between intrinsic‐muscle and extrinsic‐visual coordinates during bimanual movements
复制标题
DOI：
10.1111/ejn.15097
复制
发表时间：
2020-12
影响因子：
3.4
通讯作者：
Takeshi Sakurada;K. Kansaku
中科院分区：
文献类型：
--
作者：
Takeshi Sakurada;K. Kansaku
肢体之间的协调是通过基于内在肌肉和外在视觉坐标的多层次运动控制来实现的。在线视觉反馈影响这些坐标中的哪一个是主导的，视觉知觉参与了两只手之间运动协调的切换；然而，尚不清楚注意是否在肢体间协调中起到任何作用。因此，我们通过研究视觉干扰引起的左右手的肢体间干扰来评估注意对内在肌肉和外在视觉坐标优势的影响。我们首先展示了在线视觉反馈的差异对双手协调的影响(实验1)。然后，我们揭示了对直接影响手运动的视觉光标的关注导致了内在肌肉坐标的支配，这使得同源肌肉活动同步。相反，对由双侧手运动控制的综合视觉物体的注意与偏爱外部视觉坐标以同步双侧运动方向有关(实验2)。因此，在双手运动中观察到了内在肌肉坐标和外在视觉坐标之间的注意力依赖的转换；至少对于特定的任务要求，外在视觉坐标可能使目标导向的双手运动成为可能。
Inter‐limb coordination is achieved through multiple levels of motor control based on intrinsic‐muscle and extrinsic‐visual coordinates. Online visual feedback affects which of these coordinates is dominant, and visual perception is involved in the switching of motor coordination across the two hands; however, it remains unclear whether there is any role for attention in inter‐limb coordination. Therefore, we evaluated the effects of attention on the dominance of intrinsic‐muscle and extrinsic‐visual coordinates by investigating inter‐limb interference in the right or left hand during bimanual reaching movements, as induced by visual perturbations. We first showed an effect of differences in online visual feedback on bimanual coordination (Experiment 1). We then revealed that attention to visual cursors that directly affected the hand movement led to the dominance of the intrinsic‐muscle coordinates, which synchronized homologous muscle activities. In contrast, attention to an integrated visual object controlled by bilateral hand movements was associated with a preference for extrinsic‐visual coordinates to synchronize bilateral movement directions (Experiment 2). Thus, attention‐dependent switching between intrinsic‐muscle and extrinsic‐visual coordinates was observed during bimanual movements; extrinsic‐visual coordinates may enable goal‐directed bimanual movements at least for particular task requirements.