Visuomotor adaptation to discordant exafferent stimulation.

Abstract
Held and his co-workers claim that changes in the stimulation of receptors consequent upon self-produced movements (reafference) are essential for the development of visuomotor coordination. Stimulation of receptors in an inactive or passively moved animal (exafference) is claimed not to lead to the development of visuomotor skills. It is suggested that Held did not make any real effort to train his Ss ex-afferently. In the present experiment, a rod seen through displacing mirrors was moved towards S until it hit him. This discrepancy between vision and touch (exafference) has been found to lead to some significant adaptation of active pointing towards the real position of targets seen through displacing mirrors.

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