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首页> 外文期刊>Journal of Neurophysiology >Comparison of the responses to moving texture patterns of simple and complex cells in the cat's area 17.
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Comparison of the responses to moving texture patterns of simple and complex cells in the cat's area 17.

机译：比较猫区域17中简单和复杂细胞的运动纹理图案的响应。

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1. Whether complex (C) cells are the only truly texture-sensitive units in the cat's primary visual cortex remains controversial. In view of the strong physiological significance of having putatively only one class of cells sensitive to visual noise in the striate cortex, we reinvestigated this issue. Sensitivities of simple (S) and C cells to noise were quantitatively studied and compared in order to clearly document the response properties of cells in the striate cortex to visual noise and to establish whether one can unequivocally segregate S from C cells on the basis of those specific properties. 2. Receptive fields were stimulated with all relevant stimuli, i.e., drifting sine-wave gratings, electronically generated noise pattern of 256 x 256 elements (ratio 1:1 of dark and light elements), and flashing and moving bars (both bright and dark). 3. A total of 60 S cells out of 85 (70.6%) and 90 C cells out of 101 (81.8%) responded to the motion of visual noise. Responses of most C cells were sustained, i.e., their discharge rate was maintained at a constant level throughout presentation of the stimulus. On the other hand, responses of the majority of S cells were characterized by several bursts of discharges. On average, optimal firing rates were greater for gratings than for noise. 4. For practically all cells, responses to noise varied as a function of direction of motion. The mean direction bandwidths were, respectively, 43 +/- 24 degrees and 48 +/- 23 degrees (mean +/- SD) for S and C cells. In both groups, neurons were more broadly tuned for the direction of noise than that of gratings (t-test, P < 0.001). We rarely observed bimodal tuning curves for noise, with each peak lying on either side of the orientation curve. These results could be expected if one considers texture stimuli not in the space domain (as dot patterns) but in the frequency domain, i.e., patterns containing all spatial frequencies and orientations. 5. In general, the direction indexes of S and C cells were similar whetherthey were stimulated by drifting noise or gratings. S cells had a slight tendency to be more direction selective for noise than for gratings. 6. For all S and C cells tested, responses to noise varied as a function of drift velocity. The mean optimal velocity was 12.9 and 10.2 degrees/s for S and C cells, respectively (t-test, P > 0.05). Most cells were band-pass with mean bandwidths of 2.2 and 2.7 octaves for S and C cells, respectively.(ABSTRACT TRUNCATED AT 400 WORDS)
机译：1.复杂的（C）细胞是否是猫的主要视觉皮层中唯一真正的纹理敏感单位，仍存在争议。鉴于在纹状皮层中仅假定一类对视觉噪声敏感的细胞具有很强的生理意义，我们对此问题进行了重新研究。对简单（S）和C细胞对噪声的敏感性进行了定量研究和比较，以便清楚地记录纹状皮层中的细胞对视觉噪声的响应特性，并确定是否可以在这些基础上将S与C细胞明确分离具体属性。 2.用所有相关的刺激，即漂移的正弦波光栅，电子产生的256 x 256元素的噪声模式（暗和亮元素的比率1：1）以及闪烁和移动的条（亮和暗）刺激了接收场。 ）。 3. 85个（70.6％）中的60个S细胞和101个（81.8％）中的90个C细胞对视觉噪声的运动做出了响应。大多数C细胞的反应是持续的，即在整个刺激过程中它们的放电速率保持在恒定水平。另一方面，大多数S细胞的反应以放电的几次爆发为特征。平均而言，光栅的最佳发射率大于噪声。 4.对于几乎所有细胞，对噪声的响应随运动方向而变化。对于S和C单元，平均方向带宽分别为43 +/- 24度和48 +/- 23度（平均+/- SD）。在两组中，神经元的噪声方向都比光栅更宽（t检验，P <0.001）。我们很少观察到噪声的双峰调谐曲线，每个峰都位于方向曲线的两侧。如果不将纹理刺激考虑在空间域中（作为点图案）而是在频域中即包含所有空间频率和方向的图案，则可以预期这些结果。 5.总体而言，无论S和C单元的方向指数是由漂移噪声还是由光栅刺激的，它们的方向指数都是相似的。 S单元对噪声的方向选择比对光栅更具倾向性。 6.对于所有测试的S和C电池，对噪声的响应随漂移速度而变化。 S和C细胞的平均最佳速度分别为12.9度和10.2度/ s（t检验，P> 0.05）。大多数单元是带通的，S和C单元的平均带宽分别为2.2和2.7八度。（抽象截断为400字）

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