Neural Correlates of Induced Motion Perception in the Human Brain
Neural Correlates of Induced Motion Perception in the Human Brain
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DOI：
10.1523/jneurosci.0570-12.2012
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
H. Takemura;H. Ashida;K. Amano;A. Kitaoka;I. Murakami
中科院分区：
文献类型：
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作者：
H. Takemura;H. Ashida;K. Amano;A. Kitaoka;I. Murakami
被移动刺激包围的物理静止刺激似乎朝相反方向移动。大脑中定向选择性神经元的诱导运动和周围抑制现象的特征有相似之处。在这里，功能磁共振成像用于研究诱发运动的主观感知与皮质活动之间的联系。视觉刺激由一个中央漂移的正弦曲线组成，周围环绕着一个移动的随机点图案。测量皮质活动响应中枢刺激速度和方向变化的变化。当中央刺激以与周围相反的方向快速移动时，人类皮质区域 hMT+ 显示出最大的激活。更重要的是，当中心刺激与周围刺激沿相同方向移动且移动速度使得中心刺激看起来静止时，该区域的活动最低。结果表明，hMT+ 的活动与诱导运动调节的感知速度有关，而不是与物理速度或动力学边界有关。早期视觉区域（V1、V2、V3 和 V3A）显示出类似的模式；然而，与感知速度的关系并不像 hMT+ 那样清晰。这些结果表明，hMT+ 可能是诱导运动感知的神经关联，在对比运动信号与其周围环境以及根据空间环境自适应调节我们的运动感知方面发挥着重要作用。
A physically stationary stimulus surrounded by a moving stimulus appears to move in the opposite direction. There are similarities between the characteristics of this phenomenon of induced motion and surround suppression of directionally selective neurons in the brain. Here, functional magnetic resonance imaging was used to investigate the link between the subjective perception of induced motion and cortical activity. The visual stimuli consisted of a central drifting sinusoid surrounded by a moving random-dot pattern. The change in cortical activity in response to changes in speed and direction of the central stimulus was measured. The human cortical area hMT+ showed the greatest activation when the central stimulus moved at a fast speed in the direction opposite to that of the surround. More importantly, the activity in this area was the lowest when the central stimulus moved in the same direction as the surround and at a speed such that the central stimulus appeared to be stationary. The results indicate that the activity in hMT+ is related to perceived speed modulated by induced motion rather than to physical speed or a kinetic boundary. Early visual areas (V1, V2, V3, and V3A) showed a similar pattern; however, the relationship to perceived speed was not as clear as that in hMT+. These results suggest that hMT+ may be a neural correlate of induced motion perception and play an important role in contrasting motion signals in relation to their surrounding context and adaptively modulating our motion perception depending on the spatial context.