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KMID : 0361420120360020226
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Journal of Korean Academy of Rehabilitation Medicine
2012 Volume.36 No. 2 p.226 ~ p.232
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Effects of Night Sleep on Motor Learning Using Transcranial Magnetic Stimulation
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Lee Hae-Jin
Park Yong-Won
Jeong Dae-Ho
Jung Han-Young
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Abstract
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Objective: To investigate the eff ects of night sleep on motor cortical excitability with TMS (transcranial magnetic stimulation) and fi nger tapping performance.
Method: Eight volunteers were enrolled to investigate the eff ects of day wake or night sleep on motor learning and finger performance. Each subject underwent a fi nger tapping task over a 12 hour period, which was employed to evaluate the motor cortical excitability aff ected by motor learning. Starting at 9:00 am for the day wake cycle and restarting at 9:00 pm for the night sleep cycle. The finger tapping task was the index fi nger of the non-dominant hand with the Hangul word personal computer (PC) training program. Th e data was assessed by comparing the changes observed with the cortical excitability and fi nger tapping performance tests between the day wake and night sleep after equivalent amounts of training.
Results: The results showed that in paired-pulse techniques, there was a significant decrease of intracortical inhibition (ICI) in the morning following the night sleep cycle (p<0.05), but no signifi cant change was seen in the ICI in the evening for the day wake cycle. In addition a signifi cant decrease of the ICI was observed in comparison to the morning following the night sleep cycle and the evening following the day wake cycle (p<0.05). Th e 140% recruitment curve (RC) and accuracy of the fi nger tapping performance demonstrated a signifi cant improvement for both cycles (p<0.05).
Conclusion: Through this study, we observed that the Hangul typing practice requires both explicit and implicit skill learning. And also the off-line learning during a night of sleep may be affected by an inhibitory neurotransmitter related synaptic plasticity and by the time dependent learning with recruitments of remote or less excitable motor neurons in the primary motor cortex.
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KEYWORD
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Night sleep, Off -line learning, Hangul typing practice, Transcranial magnetic stimulation (TMS)
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