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Brain Neurorehabil. 2010 Sep;3(2):106-110. Korean. Original Article.
Joa KL , Park JH , Lee JJ , Kim TH , Jung HY .
Department of Rehabilitation Medicine, Inha University Medical School, Korea.

OBJECTIVE: To evaluate the effect of multiple sensory stimulation on cortical excitability by using transcranial magnetic stimulation (TMS). METHOD: Thirteen right handed young adults without neurological deficit were enrolled. Cortical excitability was tested by measuring recruitment of motor evoked potentials [recruitment curve (RC)], intracortical inhibition (ICI), and intracortical facilitation (ICF) at the abductor pollicis brevis of the dominant hand in two different conditions: (1) group A: active thumb and index finger pinch movement while observing the congruent finger movement in a screen with 0.2 Hz bell sound for 30 minutes, (2) group B: the same active finger movement in a dark screen with the same bell sound for 30 minutes. All of these procedures were done with a randomized crossover design. RESULTS: The amplitude of MEP and the slope of all RC (140%,160% of the resting motor threshold) of group A showed increment after visually-guided finger movement and the level of ICI showed decrement after visually guided finger movement (p<0.05), but there was no change in the level of ICF (p>0.05) in group A. In group B, the amplitude of MEP and the levels of ICI, ICF showed no significant changes following finger movement with no visual guidance (p>0.05), but the slope of RC with 140% showed increment (p<0.05). CONCLUSION: These findings suggest that cortical excitability can be enhanced by simple repetitive motor practice. The congruent sensori-motor stimulations lead to corresponding additional effect on cortical excitability, presumably by recruitment of remote motor neurons.

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