Effects of motor imagery are dependent on motor strategies.

Full Abstract

To investigate whether the facilitatory effects of motor imagery (MI) are dependent on motor strategies that vary with posture, we used transcranial magnetic stimulation to examine the effects of two forearm positions on motor-evoked potentials during an MI of index-finger abduction. MI-enhanced motor-evoked potentials of the first dorsal interosseous (prime mover) muscle in the forearm prone position were larger than those in the forearm neutral position. The opposite effects were seen in the extensor carpi radialis (synergist) muscle. These effects correspond to the different electromyography activities in the muscles when performing the actual movements in these two forearm positions. It is suggested that MI reflects different motor strategies in the contribution of agonist and synergist muscles towards a motor task.

Author information

Author/s: Liang, Nan (N); Ni, Zhen (Z); Takahashi, Makoto (M); Murakami, Tsuneji (T); Yahagi, Susumu (S); Funase, Kozo (K); Kato, Takashi (T); Kasai, Tatsuya (T);

Affiliation: Department of Rehabilitation of Locomotor System Dysfunction, Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Japan.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Neuroreport (Neuroreport), published in England. (Language: eng)

Reference: 2007-Aug; vol 18 (issue 12) : pp 1241-5

Dates: Created 2007/07/16; Completed 2007/09/27;

PMID: 17632275, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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