de Assis Chagas Amanda Mara, Alves de Faria Isabella, Saunier Ghislain, Bittencourt-Navarrete Ruben E, Nogueira-Campos Anaelli A
LabNeuro - Laboratory of Cognitive Neurophysiology, Department of Physiology, Federal University of Juiz de Fora (UFJF), Juiz de Fora, Minas Gerais, Brazil.
Laboratory of Motor Cognition, Department of Anatomy, Federal University of Pará (UFPA), Belém, Pará, Brazil.
Heliyon. 2021 Feb 10;7(2):e06189. doi: 10.1016/j.heliyon.2021.e06189. eCollection 2021 Feb.
Voluntary movements include a predictive control of the sensory-motor consequences of executed or observed actions. The motor system predicts further steps of actions relying on its pure observation. This study seeks to disclose the interference of an implicit motor prediction effect during actions reconstruction. Videos of human actions directed to objects were presented to volunteers. Subsequently, they combined four static frames of those videos randomly arranged on the screen. Such combination could be chronological (from the beginning to the end of the action) or reverse (from the end to the beginning of the action). The observed actions were also biological (human movement) or non-biological (movement of objects). The grasping began with the actor's hand in a resting position over a table (Experiment I), or with his hand in contact with the object (Experiment II). In the first experiment, participants presented lower accuracy in the biological condition rearranging in chronological order. In the second experiment, however, the accuracy was lower in reverse order. The interpretation of such results is that the implicit predictive mechanisms interfered in the rearrangement of the frames. As an example: the expected movement after a grasping action whose outcome is capping a bottle would be the withdrawal of the hand. Therefore, combining frames of a recent seen action, volunteers present less accuracy if the first frame to be placed is counterintuitive.
自主运动包括对已执行或观察到的动作的感觉运动后果进行预测性控制。运动系统依靠纯粹的观察来预测动作的后续步骤。本研究旨在揭示动作重建过程中内隐运动预测效应的干扰情况。向志愿者展示指向物体的人类动作视频。随后，他们将屏幕上随机排列的这些视频的四个静态画面进行组合。这种组合可以是按时间顺序（从动作开始到结束）或反向（从动作结束到开始）。观察到的动作也分为生物性的（人类动作）或非生物性的（物体运动）。抓握动作开始时，演员的手在桌子上方处于休息位置（实验一），或者手与物体接触（实验二）。在第一个实验中，参与者在按时间顺序重新排列生物性动作的情况下准确率较低。然而，在第二个实验中，反向排列时准确率较低。对这些结果的解释是，内隐预测机制干扰了画面的重新排列。例如：一个以盖上瓶子为结果的抓握动作之后预期的动作会是手撤回。因此，如果要放置的第一帧违反直觉，在组合最近看到的动作的画面时，志愿者的准确率会降低。
