Motion in depht provides with visual information which has proven to be very useful for the control of fine motor responses. One type of this visual information is the optic flow variables, which can be monocular and binocular. There is empirical support for the use of optic variables in motor control and psychophysical judgements. One of the optic variables, the tau parameter, signals the time to contact, that is the time that remains until an object will collide with the point of observation. Time to contact information has proven to be valuable for synchronising body movements with visual information. In spite of its limitations (constant velocity required, non-rotation required, etc), tau has been proposed as a model for action and locomotion control. In addition, some experiments have shown that other visual information may interfere with tau decreasing the performance. However, most of these experiments has used psychophysical judgements instead of a motor or action response. Recent work points to a map of visual and optic variables, among which tau is just one more. Variables like binocular relative disparity also contributes to motor modulation. The picture of visual variables that emerge from recent works raises some issues that have to be incorporated in the goals of this proposal: a) what sources of tiome to contact information can the visual system detect, how are they detected and how they control the motor response, b) the type of task (action versus judgement)where optical variables can be relevant, and c) the role of learning in the process of automatization of visually guided motor response
|Effective start/end date||28/12/01 → 27/12/04|
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