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首页> 外文期刊>The European Journal of Neuroscience >The involvement of primary motor cortex in mental rotation revealed by transcranial magnetic stimulation.
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The involvement of primary motor cortex in mental rotation revealed by transcranial magnetic stimulation.

机译：经颅磁刺激揭示初级运动皮层参与精神旋转。

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摘要

We used single-pulse transcranial magnetic stimulation of the left primary hand motor cortex and motor evoked potentials of the contralateral right abductor pollicis brevis to probe motor cortex excitability during a standard mental rotation task. Based on previous findings we tested the following hypotheses. (i) Is the hand motor cortex activated more strongly during mental rotation than during reading aloud or reading silently? The latter tasks have been shown to increase motor cortex excitability substantially in recent studies. (ii) Is the recruitment of the motor cortex for mental rotation specific for the judgement of rotated but not for nonrotated Shepard & Metzler figures? Surprisingly, motor cortex activation was higher during mental rotation than during verbal tasks. Moreover, we found strong motor cortex excitability during the mental rotation task but significantly weaker excitability during judgements of nonrotated figures. Hence, this study shows that the primary hand motor area is generally involved in mental rotation processes. These findings are discussed in the context of current theories of mental rotation, and a likely mechanism for the global excitability increase in the primary motor cortex during mental rotation is proposed.
机译：我们使用左主手运动皮层的单脉冲经颅磁刺激和对侧右外展肌短肌的运动诱发电位来探查标准精神旋转任务中的运动皮层兴奋性。根据以前的发现，我们检验了以下假设。 （i）在精神旋转过程中，手运动皮质的激活程度是否比大声朗读或静默阅读过程中的强？最近的研究表明，后者的任务可显着提高运动皮层的兴奋性。 （ii）招募用于精神旋转的运动皮层是否专门针对旋转的判断，而不是非旋转的Shepard＆Metzler人物？出人意料的是，在心理旋转过程中，运动皮层的激活高于在口头任务期间。此外，我们在智力旋转任务中发现运动皮层兴奋性强，但在判断非旋转人物时兴奋性明显弱。因此，这项研究表明，主要的手部运动区域通常参与精神旋转过程。这些发现是在目前的心理旋转理论的背景下讨论的，并提出了一种可能的机制，用于在心理旋转期间初级运动皮层的整体兴奋性增加。

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