Motter B C, Poggio G F
Department of Neuroscience, Johns Hopkins University, Baltimore, MD 21205.
Exp Brain Res. 1990;83(1):37-43. doi: 10.1007/BF00232191.
The positions of receptive field borders of striate cortical neurons were measured repeatedly in awake monkeys during attentive fixation of a small target. The border position, as marked by the onset of evoked activity in response to a moving stimulus, did not show the variability expected from previous measures of eye position variability during fixation. Measured variability was smaller than expected. Trial-by-trial comparisons suggest that receptive field borders are not shifted by the small eye movements occurring during attentive fixation. It is our hypothesis that attentive fixation engages a mechanism that gates incoming information to achieve a stabilization of the receptive field relative to the external world. Such a dynamic positional compensation may underlie preliminary evidence showing that the response of stereo-sensitive neurons in striate cortex is consistent with stimulus disparity measures and, within limits, does not reflect the retinal disparities produced by the changes in binocular alignment during fixation.
在清醒的猴子专注注视小目标期间，对纹状皮层神经元感受野边界的位置进行了反复测量。由对移动刺激的诱发活动起始所标记的边界位置，并未表现出与先前注视期间眼位变异性测量结果预期的变异性。测量到的变异性小于预期。逐次试验比较表明，感受野边界不会因专注注视期间发生的微小眼球运动而发生偏移。我们的假设是，专注注视启用了一种机制，该机制对传入信息进行门控，以实现感受野相对于外部世界的稳定。这种动态位置补偿可能是初步证据的基础，该证据表明纹状皮层中立体敏感神经元的反应与刺激视差测量结果一致，并且在一定范围内，不反映注视期间双眼对齐变化所产生的视网膜视差。
