The effect of concurrent hand movement on estimated time to contact in a prediction motion task

Abstract

In many activities, we need to predict the arrival of an occluded object. This action is called prediction motion or motion extrapolation. Previous researchers have found that both eye tracking and the internal clocking model are involved in the prediction motion task. Additionally, it is reported that concurrent hand movement facilitates the eye tracking of an externally generated target in a tracking task, even if the target is occluded. The present study examined the effect of concurrent hand movement on the estimated time to contact in a prediction motion task. We found different (accurate/inaccurate) concurrent hand movements had the opposite effect on the eye tracking accuracy and estimated TTC in the prediction motion task. That is, the accurate concurrent hand tracking enhanced eye tracking accuracy and had the trend to increase the precision of estimated TTC, but the inaccurate concurrent hand tracking decreased eye tracking accuracy and disrupted estimated TTC. However, eye tracking accuracy does not determine the precision of estimated TTC.

Motion duration is overestimated behind an occluder in action and perception tasks

“…While we did not find any effect of action type on precision (no difference in CV), we observed a slight advantage of reach over keypress such that the duration overestimation bias was reduced (better accuracy) on reach trials. This effect did not reach significance and was restricted to longer durations; however, it is still worth noting as it is in line with a recent study showing a similar trend comparing performance between ocular and ocular-manual tracking in a prediction-motion task ( Zheng & Maraj, 2018 ).…”

Prefrontal cortex activity and functional organisation in dual-task ocular pursuit is affected by concurrent upper limb movement

“…Finally, there was no difference in judgment accuracy of the primary and secondary tasks between ocular and oculo-manual tracking conditions. The implication is that although extra-retinal signals from upper limb movement may impact upon smooth pursuit eye movements 26 , they do not necessarily affect the judgement of object reappearance 28 , 31 . Indeed, we found the expected reduction in eye velocity following the loss of visual feedback, which continued as the occlusion interval progressed 12 , 13 , as well as evidence of a facilitatory effect from upper limb extra-retinal signals when the change-detection task involved the form stimulus array 25 , 26 .…”