We investigated human adaptability to delayed visual feedback in a reaching task by means of behavioral observations and a neuroimaging method, near-infrared spectroscopy (MRS). Subjects were asked to perform reaching tasks (1) with normal visual feedback (normal condition), and (2) with delayed (by 200 msec) visual feedback of subject's hand movement (delay condition). The frontal hemodynamics was measured by a multi-channel NIRS (OMM-1080S, Shimadzu). All subjects adapted to the delayed visual feedback after several trials though their performance aggravated at the beginning of the task. We observed a significant decrease in oxy-Hb at the mesial frontal area (around Fz) in the delay condition. The decrease of oxy-Hb, however, diminished gradually as the subjects adapted to the delay. We suppose that the oxy-Hb decrease in frontal motor areas reflect adaptation process to the delayed visual feedback in the reaching task.
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