Adjusting reach to lift movements to sudden visible changes in target's weight
Adjusting reach to lift movements to sudden visible changes in target's weight
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DOI：
10.1007/s00221-006-0406-x
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发表时间：
2006-09-01
影响因子：
2
通讯作者：
Castiello, Umberto
中科院分区：
文献类型：
--
作者：
Brouwer, Anne-Marie;Georgiou, Ioanna;Castiello, Umberto
人们可以在线调整他们的伸手抓握动作，以适应目标空间特性的突然变化。我们研究了当非空间属性重量突然改变时，它们是否也能做到这一点。通过使用关于物体重量的视觉线索来指导你的运动在很大程度上取决于经验，并且预计将由（缓慢的）腹侧流而不是（快速的）“在线控制”背侧流处理。在第一个实验中，参与者伸出手，举起一个具有预期或意外重量的物体。正如预测的那样，预期重量对到达阶段结束和物体升空之间的时间有影响。在第二个实验中，在参与者开始运动后，物体的重量有时会明显改变。提升时间并不取决于物体是否改变了重量。因此，参与者可以对视觉指示的体重变化进行在线调整。这些结果被解释为与现有的在线控制理论相反。
People can adjust their reach-to-grasp movements online to sudden changes in the spatial properties of a target. We investigated whether they can also do this when a non-spatial property, weight, suddenly changes. Guiding your movement by using visual cues about an object's weight depends heavily on experience and is expected to be processed by the (slow) ventral stream rather than the (fast) 'online control' dorsal stream. In the first experiment, participants reached out and lifted an object with an expected or an unexpected weight. As predicted, there was an effect of expected weight on the time between the end of the reaching phase and the object's lift-off. In the second experiment, the object sometimes visibly changed weight after the participants had started their movement. The lifting time did not depend on whether the object had changed weight. Thus, participants can make online adjustments to a visually indicated change in weight. These results are interpreted as being contrary to existing theories of online control.