PERCEIVED SPATIAL FREQUENCY SHIFT - EVIDENCE FOR FREQUENCY-SELECTIVE NEURONES IN HUMAN BRAIN
PERCEIVED SPATIAL FREQUENCY SHIFT - EVIDENCE FOR FREQUENCY-SELECTIVE NEURONES IN HUMAN BRAIN
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DOI：
10.1113/jphysiol.1970.sp009238
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发表时间：
1970-01-01
影响因子：
5.5
通讯作者：
SUTTON, P
中科院分区：
文献类型：
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作者：
BLAKEMORE, C;NACHMIAS, J;SUTTON, P
1. 长时间观察高对比度光栅图案会导致光栅空间频率的明显偏移，随后用相同的视网膜区域观察。与自适应模式相比，光栅的高频率和低频率分别看起来比实际高和低。在自适应频率本身和超过两个八度的频率上没有显著的后效。对于非常低的适应频率，后效应仍然集中在约3.0 c/℃，并随着适应频率的不断降低而减弱。后效应的大小随自适应光栅的对比度和自适应时间的延长而增加。从30分钟的适应中完全恢复需要几个小时。这种现象与方向有关：水平自适应光栅对垂直测试光栅没有影响。术后效果存在部分眼间转移。这些发现提供了进一步的证据，证明人类的视觉系统，就像猫和猴子的视觉系统一样，包含对视网膜图像的方向和尺寸选择性敏感的神经元，这些适应性强的细胞实际上参与了对简单图案大小的编码和感知。
1. Prolonged observation of a high‐contrast grating pattern causes an apparent shift in the spatial frequency of gratings subsequently viewed with the same retinal region. Gratings of higher and lower frequency than the adapting pattern seem, respectively, higher and lower than in fact they are.2. There is no significant after‐effect at the adapting frequency itself nor at frequencies more than two octaves away.3. For very low adapting frequencies, the after‐effect remains centred at about 3·0 c/deg and declines in strength as the adapting frequency is successively lowered.4. The magnitude of the after‐effect increases with the contrast of the adapting grating and the length of time spent in adaptation. It takes several hours to recover completely from 30 min adaptation.5. The phenomenon is orientation‐specific: a horizontal adapting grating has no effect on vertical test gratings. There is partial interocular transfer of the after‐effect.6. These findings provide further evidence that the visual system of man, like those of the cat and the monkey, contains neurones selectively sensitive to the orientation and dimensions of retinal images, and that these adaptable cells are actually involved in the encoding and perception of the size of simple patterns.