Nomura Makoto, Koeda Michihiko, Ikeda Yumiko, Tateno Amane, Arakawa Ryosuke, Aoyagi Yoichiro
Department of Rehabilitation Medicine, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan.
Department of Neuropsychiatry, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan.
Front Hum Neurosci. 2024 Oct 10;18:1455587. doi: 10.3389/fnhum.2024.1455587. eCollection 2024.
Mental rotation (MR) tasks of body parts involve anatomically interconnected brain systems. The systems are implicated in sensorimotor information integration and activate cortical motor-related areas, corresponding to the execution of similar motor tasks. In this study, we aimed to investigate the effect of varying the angle in the hand MR task on cerebral activation of the motor-related areas.
Twenty healthy right-handed participants were recruited. We investigated cerebral activation while each participant decided whether a hand-palm image, rotated by 0°, 90°, 180°, and 270°, was a right or left hand.
A significant negative correlation between the angle and brain activity was observed in the right and left supplementary motor area (SMA) and right posterior anterior cingulate gyrus. The SMA was inactivated with 180°- or 270°-rotated images in the regions of interest analysis. 180°- and 270°-rotated palms would be biomechanically difficult to position; thus, SMA deactivation may be closely associated with biomechanical constraints. This study provided novel findings regarding the neurophysiological mechanisms of motor imagery and may be useful in developing treatment plans using MR tasks during patient rehabilitation.
身体部位的心理旋转（MR）任务涉及解剖学上相互连接的脑系统。这些系统参与感觉运动信息整合，并激活与皮质运动相关的区域，这与执行类似的运动任务相对应。在本研究中，我们旨在探究手部MR任务中角度变化对运动相关区域脑激活的影响。
招募了20名健康的右利手参与者。我们在每位参与者判断旋转0°、90°、180°和270°的手掌图像是右手还是左手时，研究脑激活情况。
在左右辅助运动区（SMA）和右侧后前扣带回中观察到角度与脑活动之间存在显著的负相关。在感兴趣区域分析中，180°或270°旋转的图像使SMA失活。180°和270°旋转的手掌在生物力学上难以定位；因此，SMA失活可能与生物力学限制密切相关。本研究提供了关于运动想象神经生理机制的新发现，可能有助于在患者康复期间制定使用MR任务的治疗方案。
