Activation of fast sleep spindles at the premotor cortex and parietal areas contributes to motor learning: A study using sLORETA

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• 作者：Masako Tamaki ; Tatsuya Matsuoka ; Hiroshi Nittono ; Tadao Hori
• 关键词：Sleep ; Memory ; Learning ; Sleep spindle ; Fast spindle ; Premotor cortex ; Parietal associative area
• 刊名：Clinical Neurophysiology
• 出版年：2009
• 出版时间：May 2009
• 年：2009
• 卷：120
• 期：5
• 页码：878-886
• 全文大小：1098 K

文摘

Objective

The present study examined whether slow and/or fast sleep spindles are related to visuomotor learning, by examining the densities of current sleep spindle activities.

Methods

Participants completed a visuomotor task before and after sleep on the learning night. This task was not performed on the non-learning night. Standard polysomnographic recordings were made. After the amplitudes of slow and fast spindles were calculated, sLORETA was used to localize the source of slow and fast spindles and to investigate the relationship between spindle activity and motor learning.

Results

Fast spindle amplitude was significantly larger on the learning than on the non-learning nights, particularly at the left frontal area. sLORETA revealed that fast spindle activities in the left frontal and left parietal areas were enhanced when a new visuomotor skill was learned. There were no significant learning-dependent changes in slow spindle activity.

Conclusions

Fast spindle activity increases in cortical areas that are involved in learning a new visuomotor skill. The thalamocortical network that underlies the generation of fast spindles may contribute to the synaptic plasticity that occurs during sleep.

Significance

Activity of fast sleep spindles is a possible biomarker of memory deficits.