Brenner Eli, de Jonge Lara M, Tiems Niels J J, Rosenquist Glenn, Wiggers Thijs, Smeets Jeroen B J, Crowe Emily M
Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
School of Psychology, University of Nottingham, University Park, United Kingdom.
PLoS One. 2025 Sep 19;20(9):e0332171. doi: 10.1371/journal.pone.0332171. eCollection 2025.
If the target of a goal-directed arm movement is suddenly displaced, the movement is quickly adjusted in accordance with the target's new position. Such quick adjustments are even observed if the target is moving, so the arm is moving towards a future target position. If irrelevant items near that future position suddenly start moving, the arm produces a futile response in the direction of the irrelevant items' motion. We wondered whether people could learn not to respond to such irrelevant motion. To find out, we had participants intercept targets that moved across a background consisting of hundreds of small dots (irrelevant items). At a fixed time before the target reached an interception zone, the background dots started moving. The response to this irrelevant motion declined across the first few hundred trials, but it never fully disappeared. Including trials in which the target jumped established that participants learnt to reduce their response to the irrelevant motion, rather than to reduce their response to any new information. We conclude that participants can reduce the extent to which they respond to irrelevant motion, but that they cannot suppress such responses altogether.
如果目标导向的手臂运动目标突然移位，该运动会根据目标的新位置迅速调整。即使目标在移动，即手臂正朝着未来目标位置移动时，也能观察到这种快速调整。如果该未来位置附近的无关物体突然开始移动，手臂会朝着无关物体的运动方向产生徒劳的反应。我们想知道人们是否能够学会不对此类无关运动做出反应。为了找到答案，我们让参与者拦截在由数百个小点（无关物体）组成的背景中移动的目标。在目标到达拦截区域之前的固定时间，背景点开始移动。在最初的几百次试验中，对这种无关运动的反应逐渐减弱，但从未完全消失。包括目标跳跃的试验表明，参与者学会了减少对无关运动的反应，而不是减少对任何新信息的反应。我们得出结论，参与者可以减少对无关运动的反应程度，但不能完全抑制此类反应。
