Cortex ( IF 3.6 ) Pub Date : 2020-10-17 , DOI: 10.1016/j.cortex.2020.10.001 Frederic R Danion 1 , James Mathew 1 , Niels Gouirand 1 , Eli Brenner 2
When tracking targets moving in various directions with one's eyes, horizontal components of pursuit are more precise than vertical ones. Is this because horizontal target motion is predicted better or because horizontal movements of the eyes are controlled more precisely? When tracking a visual target with the hand, the eyes also track the target. We investigated whether the directional asymmetries that have been found during isolated eye movements are also present during such manual tracking, and if so, whether individual participants' asymmetry in eye movements is accompanied by a similar asymmetry in hand movements. We examined the data of 62 participants who used a joystick to track a visual target with a cursor. The target followed a smooth but unpredictable trajectory in two dimensions. Both the mean gaze-target distance and the mean cursor-target distance were about 20% larger in the vertical direction than in the horizontal direction. Gaze and cursor both followed the target with a slightly longer delay in the vertical than in the horizontal direction, irrespective of the target's trajectory. The delays of gaze and cursor were correlated, as were their errors in tracking the target. Gaze clearly followed the target rather than the cursor, so the asymmetry in both eye and hand movements presumably results from better predictions of the target's horizontal than of its vertical motion. Altogether this study speaks for the presence of anisotropic predictive processes that are shared across effectors.
中文翻译:
用眼睛和手比垂直目标运动更精确地跟踪水平
当用眼睛跟踪在各个方向上移动的目标时,水平的跟踪分量要比垂直的跟踪分量更精确。是因为可以更好地预测水平目标运动,还是因为可以更精确地控制眼睛的水平运动?当用手跟踪视觉目标时,眼睛也会跟踪目标。我们调查了在这种手动跟踪过程中是否还存在在孤立的眼睛运动过程中发现的方向不对称,如果存在,是否个体参与者的眼睛运动不对称也伴随着类似的手部运动不对称。我们检查了62位参与者的数据,他们使用操纵杆通过光标跟踪视觉目标。目标在二维上遵循平滑但不可预测的轨迹。平均注视目标距离和平均光标目标距离在垂直方向上均比在水平方向上大约20%。无论目标的轨迹如何,凝视和光标在垂直方向上的延迟都比在水平方向上的延迟稍长。视线和光标的延迟以及它们在跟踪目标时的误差也相关。注视明显跟随目标而不是光标,因此,眼动和手部运动的不对称性大概是由于对目标水平方向的预测优于对垂直运动的预测。总而言之,这项研究表明存在效应器之间共享的各向异性预测过程。无论目标的轨迹如何,凝视和光标在垂直方向上的延迟都比在水平方向上的延迟稍长。视线和光标的延迟以及它们在跟踪目标时的误差也相关。注视明显跟随目标而不是光标,因此,眼动和手部运动的不对称性大概是由于对目标水平方向的预测优于对垂直运动的预测。总而言之,这项研究表明存在效应器之间共享的各向异性预测过程。无论目标的轨迹如何,凝视和光标在垂直方向上的延迟都比在水平方向上的延迟稍长。视线和光标的延迟以及它们在跟踪目标时的误差也相关。注视明显跟随目标而不是光标,因此,眼动和手部运动的不对称性大概是由于对目标水平方向的预测优于对垂直运动的预测。总而言之,这项研究表明存在效应器之间共享的各向异性预测过程。注视明显跟随目标而不是光标,因此,眼动和手部运动的不对称性大概是由于对目标水平方向的预测优于对垂直运动的预测。总而言之,这项研究表明存在效应器之间共享的各向异性预测过程。注视明显跟随目标而不是光标,因此,眼动和手部运动的不对称性大概是由于对目标水平方向的预测优于对垂直运动的预测。总而言之,这项研究表明存在效应器之间共享的各向异性预测过程。