The purpose of the present study was to identify the effect of acoustic neurofeedback on brain activity during consecutive stages of mental rotation of 3D objects. Given the fact that the process of mental rotation of objects is associated with desynchronisation of beta rhythm (beta ERD), it was expected that suppression in this band would be greater in the experimental group than in the controls. Thirty-three participants were randomly allocated to two groups performing the classic Shepard–Metzler mental rotation task (1971). The experimental group received auditory stimuli when the level of concentration fell below the threshold value determined separately for each participant based on the engagement index [β/(α + Θ)]. The level of concentration in the control group was not stimulated. Compared to the controls, the experimental group was found with greater beta-band suppression recorded above the left parietal cortex during the early stage and above the right parietal cortex during the late stage of mental rotation task. At the late stage of mental rotation, only the experimental group was found with differences in beta ERD related to varied degrees of the rotation angle and the control condition (zero angles, no rotation) recorded above the right parietal cortex and the central area of cerebral cortex. The present findings suggest that acoustic feedback might improve the process of mental rotation.

中文翻译：

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声学神经反馈会增加心理旋转任务期间的 Beta ERD。


本研究的目的是确定在 3D 物体心理旋转的连续阶段中声神经反馈对大脑活动的影响。鉴于物体的心理旋转过程与β节律（β ERD）的去同步化相关，预计实验组中该频带的抑制会比对照组更大。 33 名参与者被随机分配到两组，执行经典的 Shepard-Metzler 心理旋转任务（1971）。当注意力水平低于根据参与指数[β/(α + θ)]为每个参与者单独确定的阈值时，实验组接受听觉刺激。对照组的注意力水平没有受到刺激。与对照组相比，实验组在心理旋转任务的早期阶段在左顶叶皮层上方记录了更大的β带抑制，在精神旋转任务的后期阶段在右顶叶皮层上方记录了更大的β带抑制。在心理旋转后期，仅实验组在右侧顶叶皮层上方和大脑中央区域记录到与不同程度的旋转角度和控制条件（零角度，不旋转）相关的β ERD差异。皮质。目前的研究结果表明，声反馈可能会改善心理旋转的过程。