Speed-dependent motion sensitive responses in V5: an fMRI study
Speed-dependent motion sensitive responses in V5: an fMRI study
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V5 中速度相关的运动敏感反应：一项功能磁共振成像研究
DOI：
10.1016/s1053-8119(18)31164-9
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发表时间：
1998
期刊：
影响因子：
5.7
通讯作者：
Karl J. Friston
中科院分区：
文献类型：
--
作者：
D. Chawla;J. Phillips;C. Buechel;R. Edwards;Karl J. Friston
这项功能磁共振成像研究检查了人类 V5 区域的运动敏感反应作为刺激速度的函数。与电生理学发现一致，我们观察到在 7°/s 至 30°/s 左右的中间速度下的最佳反应。结果与 V3a 中观察到的速度非线性（倒“U”）依赖性一致。观察到 V1 激活随着速度增加而线性下降。这与 V1 中的速度敏感单元已被证明调整到比 V5 中慢得多的速度这一事实是一致的。
This fMRI study examined motion-sensitive responses in human area V5 as a function of stimulus speed. Consistent with electrophysiological findings, we observed optimal responses at intermediate speeds of around 7°/s to 30°/s. The results are consistent with a nonlinear (inverted “U”) dependency on speed that was also observed in V3a. V1 activation was observed to decrease linearly as speed increased. This is consistent with the fact that speed-sensitive cells in V1 have been shown to be tuned to much slower speeds than in V5.