The role of visual feedback of hand position in the control of manual prehension

摘要: Although it is obvious that vision plays a primary role in reaching and grasping objects, the sources of visual information used programming controlling various aspects these movements still being investigated. One source feedback relating to characteristics reach itself – for example, speed trajectory moving limb change posture hand fingers. The present study selectively eliminated this by blocking subject’s view with an opaque barrier while enabling subjects goal object. Thus, direct comparison was made between standard (closed-loop) object-only (open-loop) visual-feedback conditions situation which light levels contrast object its surroundings were equivalent both viewing conditions. Reach duration longer proportionate increases acceleration deceleration phases when prevented. Maximum grip aperture proportion movement time at occurred same previous studies did not employ constant across closed- open-loop conditions, dissociation found spatial temporal dimensions formation. It appears can be programmed without presumably via combination about proprioceptive (and/or efference copy). Nevertheless, maximum (like kinematic markers examined transport component) also delayed In other words, relative timing events essentially unchanged, reflecting perhaps tight coupling components.