UCL Interaction Centre (UCLIC), University College London, London, United Kingdom.
DEI Interactive Systems Group, Computer Science Department, Universidad Carlos III de Madrid, Leganés, Spain.
PLoS One. 2018 Jun 27;13(6):e0199354. doi: 10.1371/journal.pone.0199354. eCollection 2018.
When we drop an object from our hands, we use internal models of both our body height and object-motion to predict when it will hit the floor. What happens if the sensory feedback finally received from the impact conflicts with this prediction? The present study shows that such conflict results in changes in the internal estimates of our body height: When the object people dropped takes longer than expected to hit the floor, they report feeling taller and behave as if their legs were longer. This provides the first evidence of cross-modal recalibration of body-height representations as a function of changes in the distant environment. Crucially, the recalibration results from a mismatch between the predicted and actual outcome of an action, the ball's release and impact, which are causally-related but separated in space and time. These results suggest that implicit models of object-motion can interact with implicit and explicit models of one's body height.
当我们从手中掉落物体时，我们会使用自身高度和物体运动的内部模型来预测物体何时会撞击地面。如果最终从撞击中接收到的感觉反馈与这种预测相冲突会怎样？本研究表明，这种冲突会导致对自身高度的内部估计发生变化：当人们掉落的物体比预期的时间更长才撞击地面时，他们会感觉自己更高，并表现得好像自己的腿更长。这提供了第一个证据，证明身体高度的跨模态重新校准是作为对远距离环境变化的反应。至关重要的是，重新校准是由行动的预期和实际结果之间的不匹配引起的，球的释放和撞击是因果相关的，但在空间和时间上是分开的。这些结果表明，物体运动的隐含模型可以与对自身身体高度的隐含和显式模型相互作用。
