ORIENTATIONAL SELECTIVITY OF HUMAN VISUAL SYSTEM
ORIENTATIONAL SELECTIVITY OF HUMAN VISUAL SYSTEM
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DOI：
10.1113/jphysiol.1966.sp008101
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发表时间：
1966-01-01
影响因子：
5.5
通讯作者：
KULIKOWSKI, JJ
中科院分区：
文献类型：
--
作者：
CAMPBELL, FW;KULIKOWSKI, JJ
已知的是，当在包含与对象类似的结构的背景下观察对象时，该对象不易被检测到。研究了改变目标和背景之间的方位对图像质量的影响。可变对比度的光栅在2个示波器上产生;这些光栅被光学叠加。它们之间的方位角可以改变。一个光栅（测试光栅）的阈值在另一个光栅（掩蔽光栅）存在的情况下确定。当光栅具有相同的取向（并且相位锁定）时，发现测试光栅的增量阈值与掩蔽光栅的阈上对比度成比例。随着测试光栅和掩蔽光栅之间的角度增加，掩蔽效应呈指数下降。在12[度]的任何一方的垂直测试光栅的掩蔽效应是re？相对于它的最大值以2的因子减少。该角度与掩模的对比度、焦点以及掩模光栅的相位相干性无关。是否存在测试光栅？艾德斜掩蔽的效果略less. The狭窄orientationally调谐通道发现psychopperically通过这种掩蔽技术相比，在猫的视觉皮层的电生理发现的orientationally敏感的细胞。
It is known that an object is less detectable when it is viewed against a background containing structures similar to the object. The effect of changing the orientation between the object and background is investigated. Gratings of variable contrast were generated on 2 oscilloscopes; these were superimposed optically. The angle of orientation between them could be changed. The threshold of one grating, the test grating, was determined in the presence of the other, the masking grating. When the gratings were presented with the same orientation (and locked in phase) the increment threshold of the test grating was found to be proportional to the suprathreshold contrast of the masking grating. As the angle between the test and masking gratings was increased the masking effect fell exponentially. At 12[degree] on either side of a vertical test grating the masking effect was re?duced by a factor of 2 with respect to its maximum value. This angle was independent of the contrast level of masking, the focus, and also the phase coherence of the masking grating. If the test grating was presen?ed obliquely the effect of masking was slightly less. The narrow orientationally tuned channels found psychophysically by this masking technique are compared with the orientationally sensitive cells discovered electrophysiologically in the visual cortex of the cat.