Mather J A, Lackner J R
Exp Brain Res. 1981;43(3-4):406-12. doi: 10.1007/BF00238383.
Oculomotor tracking of one's moving hand is considerably more accurate than tracking of an external target undergoing comparable motion. To identify the factors contributing to this enhancement of tracking accuracy, the influence of visual, proprioceptive, and efferent cues on tracking performance was assessed. Related observations were made on the influence both of linear and topological transformations between target and hand position on tracking accuracy. The experimental findings indicate that if a target light is attached to one's hand, a) the target can be tracked with comparable accuracy for active and passive limb movements, and b) when the entire hand rather than just the target light is visible, pursuit velocity is higher and more closely matches target velocity. If a linear transformation is introduced between hand and target positions, nearly identical tracking accuracy is found with voluntary and involuntary limb movements. By contrast, topological transformations degrade target tracking accuracy for passive but not for voluntary limb movements. The implications of this finding are discussed.
对自己移动手部的动眼跟踪比跟踪进行类似运动的外部目标要准确得多。为了确定导致跟踪精度提高的因素，评估了视觉、本体感觉和传出线索对跟踪性能的影响。还对目标与手部位置之间的线性和拓扑变换对跟踪精度的影响进行了相关观察。实验结果表明，如果将目标灯附着在手上，a）对于主动和被动肢体运动，目标都能以相当的精度被跟踪；b）当整个手部而非仅仅目标灯可见时，追踪速度更高且更紧密地匹配目标速度。如果在手部和目标位置之间引入线性变换，在自愿和非自愿肢体运动中发现几乎相同的跟踪精度。相比之下，拓扑变换会降低被动肢体运动的目标跟踪精度，但不会降低自愿肢体运动的目标跟踪精度。讨论了这一发现的意义。
