Apolinário-Souza Tércio, Romano-Silva Marco Aurélio, de Miranda Débora Marques, Malloy-Diniz Leandro Fernandes, Benda Rodolfo Novellino, Ugrinowitsch Herbert, Lage Guilherme Menezes
School of Physical Education, Physiotherapy and Occupational Therapy, GEDAM, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Faculty of Medicine, INCT de Medicina Molecular, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Physiol Behav. 2016 Jun 1;160:18-25. doi: 10.1016/j.physbeh.2016.03.025. Epub 2016 Mar 24.
The functional role of the primary motor cortex (M1) in the production of movement parameters, such as length, direction and force, is well known; however, whether M1 is associated with the parametric adjustments in the absolute timing dimension of the task remains unknown. Previous studies have not applied tasks and analyses that could separate the absolute (variant) and relative (invariant) dimensions. We applied transcranial direct current stimulation (tDCS) to M1 before motor practice to facilitate motor learning. A sequential key-pressing task was practiced with two goals: learning the relative timing dimension and learning the absolute timing dimension. All effects of the stimulation of M1 were observed only in the absolute dimension of the task. Mainly, the stimulation was associated with better performance in the transfer test in the absolute dimension. Taken together, our results indicate that M1 is an important area for learning the absolute timing dimension of a motor sequence.
初级运动皮层（M1）在运动参数（如长度、方向和力量）产生过程中的功能作用已广为人知；然而，M1是否与任务绝对时间维度中的参数调整相关仍不清楚。以往的研究尚未应用能够区分绝对（可变）和相对（不变）维度的任务和分析方法。我们在运动练习前对M1施加经颅直流电刺激（tDCS）以促进运动学习。进行了一个顺序按键任务，有两个目标：学习相对时间维度和学习绝对时间维度。对M1的刺激效果仅在任务的绝对维度中观察到。主要是，这种刺激与绝对维度转移测试中的更好表现相关。综上所述，我们的结果表明M1是学习运动序列绝对时间维度的重要区域。
