不同方向视觉运动追踪的特性

VISUAL SMOOTH PURSUIT IN DIFFERENT DIRECTIONS

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。

In this experiment,we examined the characteristics of visual smooth pursuit under different direction conditions. Three major findings were noted. First,a significant difference was observed between horizontal and vertical pursuit. This difference was shown in almost all eye movement indices. Second,differences were also observed between the 'toward left' and the 'toward right' and between the up and the down conditions. These differences were registered only in data structures of pursuits. Third,we found that the distance of saccades was the most sensitive index of eye movement. In addition to these findings,we also noted that the effects of different direction conditions might be registered differently by different eye movement indices. This observation,which points to the complexity of visual pursuit research,warrants further investigation. The spectral analysis used to analyze eye movement in this study provides an alternative method that we believe is more effective than some of the traditional methods.