Department of Psychology, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.
Cortex. 2021 Feb;135:173-185. doi: 10.1016/j.cortex.2020.11.012. Epub 2020 Dec 5.
Grasping actions are directed not only toward objects we see but also toward objects we both see and touch (multisensory grasping). In this latter case, the integration of visual and haptic inputs improves movement performance compared to each sense alone. This performance advantage could be due to the integration of all the redundant positional and size cues or to the integration of only a subset of these cues. Here we selectively provided specific cues to tease apart how these different sensory sources contribute to visuo-haptic multisensory grasping. We demonstrate that the availability of the haptic positional cue together with the visual cues is sufficient to achieve the same grasping performance as when all cues are available. These findings provide strong evidence that the human sensorimotor system relies on non-visual sensory inputs and open new perspectives on their role in supporting vision during both development and adulthood.
抓握动作不仅针对我们看到的物体，也针对我们既看到又触摸到的物体（多感觉抓握）。在后一种情况下，与单独使用每种感觉相比，视觉和触觉输入的整合会提高运动表现。这种性能优势可能归因于所有冗余位置和大小线索的整合，或者仅归因于这些线索的子集的整合。在这里，我们有选择地提供了特定的线索，以探究这些不同的感觉来源如何有助于视触觉多感觉抓握。我们证明，触觉位置线索的可用性与视觉线索一起足以实现与所有线索可用时相同的抓握性能。这些发现为人类感觉运动系统依赖非视觉感觉输入提供了有力证据，并为它们在儿童期和成年期支持视觉的作用开辟了新的视角。
