Short-Term and Long-Term Adaptative Changes in Eye—Head Movement Coordination Resulting from Reduced Peripheral Vision
Fine visual discrimination of an object requires stabilization of the image on the fovea. If the head is immobile and the target in motion, the smooth pursuit system and the saccadic system cooperate first to move the eyes in the direction of the object then to maintain its image in the fovea. In such a task, visual discrimination may start after a delay of the order of 300 msec for a target presented and set into motion 10° from the fovea. Indeed, the saccadic and the smooth pursuit systems have a reaction time of 200 and 130 msec, respectively, whereas a 10° saccade lasts about 100 msec (Robinson, 1981). When the head and the eyes move in the direction of the target, the final position of the eyes in space is the result of the linear summation of the position of the eyes in the orbits and the position of the head in space. To reach such final positions both the eyes and the head move according to particular patterns showing definite eye and head coordination (Bizzi et al., 1972).
KeywordsHead Movement Head Rotation Peripheral Vision Target Eccentricity Illusory Motion
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