from Part I - Time–space during action: perisaccadic mislocalization and reaching
Published online by Cambridge University Press: 05 October 2010
Summary
Visual information is crucial for goal-directed reaching. Recently a number of studies have shown that motion in particular is an important source of information for the visuomotor system. For example, when reaching for a stationary object, nearby visual movement, even when irrelevant to the object or task, can influence the trajectory of the hand. Although it is clear that various kinds of visual motion can influence goal-directed reaching movements, it is less clear how or why they do so. In this chapter, we consider whether the influence of motion on reaching is unique compared to its influence on other forms of visually guided behavior. We also address how motion is coded by the visuomotor system and whether there is one motion processing system that underlies both perception and visually guided reaching. Ultimately, visual motion may operate on a number of levels, influencing goal-directed reaching through more than one mechanism, some of which may actually be beneficial for accurate behavior.
Introduction
Visual motion is constantly produced as we move our eyes and head and as objects move in the world. The visuomotor system, therefore, faces a serious challenge in that it must register target as well as background motion and then segment these different sources of motion in order to direct actions to objects. Over the last three decades, a broad and expanding literature has examined how the visuomotor system processes and uses visual motion in goal-directed behavior.
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