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[Abstract Title]. - Society for Neuroscience

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277. Voluntary Movement: Cortical Planning and Execution II<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 277.1/KK27<br />

Topic: D.17.b. Cortical planning and execution<br />

<strong>Title</strong>: Corticospinal excitability is enhanced by combining action observation and motor imagery<br />

Authors: *M. SAKAMOTO 1 , T. MURAOKA 2 , N. MIZUGUCHI 3 , K. KANOSUE 1 ;<br />

1 Sport Sci., 2 ASMeW, 3 Grad. Sch. of Sport Sci., Waseda Univ., Tokorozawa, Japan<br />

<strong>Abstract</strong>: The size of motor-evoked potential (MEP) increased during action observation and<br />

motor imagery. The present study investigated whether the size of MEP further increased when<br />

humans simultaneously per<strong>for</strong>med action observation and motor imagery. MEPs induced by<br />

transcranial magnetic stimulation were recorded from the biceps brachii muscle. The participants<br />

per<strong>for</strong>med four tasks: 1) they just passively observed the elbow action presented on the screen<br />

(OBS), 2) they closed their eyes and imagined flexing and extending their right elbow (IMAG),<br />

3) they opened their eyes and imagined the same action while observing the elbow action<br />

presented on the screen (OBS+IMAG), 4) they observed the fixed point presented on the screen<br />

and held their muscles at rest (control). The size of MEP during IMAG and OBS+IMAG<br />

significantly increased compared to that during the control. In addition, the degree of facilitation<br />

of MEP size during OBS+IMAG was significantly greater than that during OBS and IMAG.<br />

Furthermore, the facilitation of MEP size during OBS+IMAG was significantly larger than the<br />

algebraic sum of the effect caused by OBS and IMAG. However, when the participants imagined<br />

the elbow flexion-extension while they observed the same action on the screen 180° out of phase,<br />

MEP size did not increased compared to that during only imagery of the elbow action. These<br />

findings suggest that the combination of action observation and motor imagery could enhance<br />

the corticospinal excitability, possibly through the modulation of the mirror systems.<br />

Disclosures: M. Sakamoto, None; T. Muraoka, None; N. Mizuguchi, None; K. Kanosue,<br />

None.<br />

Poster<br />

277. Voluntary Movement: Cortical Planning and Execution II<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 277.2/KK28<br />

Topic: D.17.b. Cortical planning and execution

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