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首页> 外文期刊>Journal of Neurophysiology >Hierarchy of direction-tuned motion adaptation in human visual cortex.
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Hierarchy of direction-tuned motion adaptation in human visual cortex.

机译：人类视觉皮层中方向调整运动适应的层次结构。

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Prolonged exposure to a single direction of motion alters perception of subsequent static or dynamic stimuli and induces substantial changes in behaviors of motion-sensitive neurons, but the origin of neural adaptation and neural correlates of perceptual consequences of motion adaptation in human brain remain unclear. Using functional magnetic resonance imaging, we measured motion adaptation tuning curves in a fine scale by probing changes in cortical activity after adaptation for a range of directions relative to the adapted direction. We found a clear dichotomy in tuning curve shape: cortical responses in early-tier visual areas reduced at around both the adapted and opposite direction, resulting in a bidirectional tuning curve, whereas response reduction in high-tier areas occurred only at around the adapted direction, resulting in a unidirectional tuning curve. We also found that the psychophysically measured adaptation tuning curves were unidirectional and best matched the cortical adaptation tuning curves in the middle temporal area (MT) and the medial superior temporal area (MST). Our findings are compatible with, but not limited to, an interpretation in which direct impacts of motion adaptation occur in both unidirectional and bidirectional units in early visual areas, but the perceptual consequences of motion adaptation are manifested in the population activity in MT and MST, which may inherit those direct impacts of adaptation from the directionally selective units.
机译：长时间暴露于单一运动方向会改变对随后的静态或动态刺激的感知，并引起运动敏感神经元行为的实质性变化，但是神经适应性的起源以及人类大脑中运动适应性感知结果的神经相关性尚不清楚。通过使用功能磁共振成像，我们通过探测相对于适应方向的一系列方向适应后皮质活动的变化，以精细的比例测量了运动适应调谐曲线。我们发现在调整曲线形状上存在明显的二分法：早期视觉区域的皮质反应在适应和相反的方向均减少，从而形成双向调整曲线，而高层区域的反应减少仅在适应方向附近发生，从而产生单向调谐曲线。我们还发现，从心理上测得的适应性调整曲线是单向的，并且与中颞叶区域（MT）和内侧颞上区域（MST）的皮质适应调整曲线最匹配。我们的发现与（但不限于）一种解释相吻合，在这种解释中，运动适应的直接影响发生在早期视觉区域的单向和双向单元中，但是运动适应的感知结果体现在MT和MST的人口活动中，可能会从方向选择单元继承适应的直接影响。

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