Showing papers by "Marc Jeannerod published in 1979"
TL;DR: The closed loop situation of hand pointing at a target has been experimentally divided into its static and dynamic components, and it is suggested that initial cues as regards hand and target position, improve the motor program by a better identification of initial and final states.
Abstract: In a task requiring an optimal hand pointing (with regards to both time and accuracy) at a peripheral target, there is first a saccade of the eye within 250 ms, followed 100 ms later by the hand movement. However the latency of the hand movement is poorly correlated with that of the eye movement. When the peripheral target is cut off at the onset of the saccade, there is no correlation between the error of the gaze position and the error of the hand pointing. This suggests an early parallel processing of the two motor outputs. The duration of hand movement does not change significantly when subjects either see or not see their hand (closed or open loop). In the open loop situation, the undershoot of the hand pointing increases with target eccentricity, whatever the subjects are allowed or not to do a saccade toward the target. It suggests that the encoding of eye position by itself is a poor index for an accurately guided movement of the hand.
579 citations
TL;DR: In a task requiring an optimal hand pointing at a peripheral target, there is first a saccade of the eye within 250 ms, followed 100 ms later by the hand movement, which suggests an early parallel processing of the two motor outputs.
Abstract: In a task requiring an optimal hand pointing (with regards to both time and accuracy) at a peripheral target, there is first a saccade of the eye within 250 ms, followed 100 ms later by the hand movement. However the latency of the hand movement is poorly correlated with that of the eye movement. When the peripheral target is cut off at the onset of the saccade, there is no correlation between the error of the gaze position and the error of the hand pointing. This suggests an early parallel processing of the two motor outputs. The duration of hand movement does not change significantly when subjects either see or not see their hand (closed or open loop). In the open loop situation, the undershoot of the hand pointing increases with target eccentricity, whatever the subjects are allowed or not to do a saccade toward the target. It suggests that the encoding of eye position by itself is a poor index for an accurately guided movement of the hand.
488 citations
TL;DR: It is proposed that corollary discharge could either produce an active cancellation of the effects of eye movements on vision, or contribute to the evaluation that a given visual change is provoked by a saccade.
77 citations
TL;DR: Vestibulo-ocular response (VOR) has been recorded in kittens aged between 10 and 61 postnatal days and responses to velocity steps and to sinusoidal oscillations are present on the earliest recordings, though they are limited to a low gain slow compensatory gaze displacement.
24 citations
TL;DR: During paradoxical sleep, VOR disappeared in all cases and was replaced by randomly occurring bursts of rapid eye movements, which were discussed in terms of a parametric control model of VOR.
8 citations
4 citations