Indovina Iole, Maffei Vincenzo, Bosco Gianfranco, Zago Myrka, Macaluso Emiliano, Lacquaniti Francesco
Department of Neuromotor Physiology, Scientific Institute Foundation Santa Lucia, via Ardeatina 306, 00179 Rome, Italy.
Science. 2005 Apr 15;308(5720):416-9. doi: 10.1126/science.1107961.
How do we perceive the visual motion of objects that are accelerated by gravity? We propose that, because vision is poorly sensitive to accelerations, an internal model that calculates the effects of gravity is derived from graviceptive information, is stored in the vestibular cortex, and is activated by visual motion that appears to be coherent with natural gravity. The acceleration of visual targets was manipulated while brain activity was measured using functional magnetic resonance imaging. In agreement with the internal model hypothesis, we found that the vestibular network was selectively engaged when acceleration was consistent with natural gravity. These findings demonstrate that predictive mechanisms of physical laws of motion are represented in the human brain.
我们如何感知受重力加速的物体的视觉运动？我们提出，由于视觉对加速度的敏感度较低，一个计算重力影响的内部模型是从重力感知信息中推导出来的，存储在前庭皮层中，并由与自然重力似乎一致的视觉运动激活。在使用功能磁共振成像测量大脑活动的同时，对视觉目标的加速度进行了操控。与内部模型假说一致，我们发现当前庭网络加速度与自然重力一致时，前庭网络被选择性激活。这些发现表明，运动物理定律的预测机制在人类大脑中有所体现。
