对比感知与电生理相关性。
Contrast perception and electrophysiological correlates.
作者信息
Fiorentini A, Maffei L
出版信息
J Physiol. 1973 May;231(1):61-9. doi: 10.1113/jphysiol.1973.sp010219.
Abstract
- Previous findings show that the amplitude of the human visual potentials evoked by gratings alternating in phase at several c/s is linearly related to the logarithm of the grating contrast.2. Similar previous experiments on the cat have shown that both the amplitude of evoked potentials and the amplitude of the response of simple cortical cells to alternating gratings increase linearly with the logarithm of the contrast. No such relation is found for single neurones in the retina or in the lateral geniculate body.3. In this work the contrast of a grating is evaluated psychophysically by human subjects in a range of more than 10 times above threshold, using a binocular matching technique.4. The apparent contrast is found to increase linearly with the logarithm of the stimulus contrast.5. The conclusion is drawn that the linear relation between apparent contrast and the logarithm of the objective contrast might be the outcome of a process of elaboration that is carried out at the simple cell level.
摘要
先前的研究结果表明，由每秒若干周相位交替的光栅诱发的人类视觉电位的振幅与光栅对比度的对数呈线性关系。
先前在猫身上进行的类似实验表明，诱发电位的振幅以及简单皮层细胞对交替光栅的反应振幅均随对比度的对数呈线性增加。而在视网膜或外侧膝状体的单个神经元中未发现此类关系。
在这项研究中，使用双眼匹配技术，由人类受试者通过心理物理学方法在高于阈值10倍以上的范围内评估光栅的对比度。
发现表观对比度随刺激对比度的对数呈线性增加。
得出的结论是，表观对比度与客观对比度的对数之间的线性关系可能是在简单细胞水平上进行的精细化过程的结果。
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