Form Properties of Moving Targets Bias Smooth Pursuit Target Selection in Monkeys

During natural viewing,we often recognize multiple objects,detect their motion,and select one object as the target to track.It remains to be determined how such behavior is guided by the integration of visual form and motion perception.To address this,we studied how monkeys made a choice to track moving targets with different forms by smooth pursuit eye movements in a two-target task.We found that pursuit responses were biased toward the motion direction of a target with a hole.By computing the relative weighting,we found that the target with a hole exhibited a larger weight for vector computation.The global hole feature dominated other form properties.This dominance failed to account for changes in pursuit responses to a target with different forms moving singly.These findings suggest that the integration of visual form and motion perception can reshape the competition in sensorimotor networks to guide behavioral selection.

不同方向视觉运动追踪的特性

对向左、向右、向上与向下 4个方向的平滑运动视觉追踪的眼动特点进行了探讨 ,并采用了频谱分析的方法对 4个方向上视觉追踪的眼动参数进行了分析。结果表明 ,( 1)水平追踪与垂直追踪之间的差异较为普遍 ,几乎存在于所有的眼动参数上 ;( 2 )左右追踪之间、上下追踪之间也分别都存在差异 ,它们主要表现在数据分布结构上 ;( 3 )眼睛跳动距离是视觉追踪的敏感指标。另外 ,不同方向的差异在不同眼动参数之间并不具有一致性。这反映了视觉追踪眼动的复杂性 ,不同类型眼动之间存在相互关联 ,这种关联性还有待于进一步研究。