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首页> 外文期刊>Journal of Neurophysiology >Effects of contrast and contrast adaptation on static receptive field features in macaque area VI
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Effects of contrast and contrast adaptation on static receptive field features in macaque area VI

机译：对比度和对比度适应对猕猴第六区静态感受野特征的影响

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摘要

The spatiotemporal features of the "static" receptive field (RF), as revealed with flashing bars or spots, determine other RF properties. We examined how some of these static RF features vary with contrast and contrast adaptation in area VI of the anesthetized macaque monkey. RFs were mapped with light and dark flashing bars presented at three different contrasts, with the low and medium contrasts eliciting approximately 1/3 and 2/3 of the high-contrast response amplitude. The main results are as follows: i) RF widths decreased when contrast decreased; however, the amount of decrease was less than that expected from an iceberg model and closer to the expectation of a contrast invariance of the RF width. 2) Area tuning experiments with drifting gratings showed an opposite effect of contrast: an increase in preferred stimulus diameter when contrast decreased. This implies that the effect of contrast on preferred stimulus size is not predictable from the static RF. 3) Contrast adaptation attenuated the effect of contrast on RF amplitude but did not significantly modify RF width. 4) RF subregion overlap was only marginally affected by changes in contrast and contrast adaptation; the classification of cells as simple and complex, when established from subregion overlap, appears to be robust with respect to changes in contrast and adaptation state. Previous studies have shown that the spatiotemporal features of the RF depend largely on the stimuli used to map the RF. This study shows that contrast is one elemental feature that contributes to the dynamics of the RF.
机译：如闪烁的条形或斑点所示，“静态”接收场（RF）的时空特征决定了其他RF属性。我们检查了这些静态射频特征在麻醉的猕猴VI区域随对比度和对比度适应如何变化。 RF映射有以三种不同对比度呈现的亮和暗闪烁条，低和中对比度引起高对比度响应幅度的大约1/3和2/3。主要结果如下：i）对比度降低时射频宽度减小;但是，减少的量小于冰山模型的预期，更接近RF宽度对比度不变的预期。 2）使用漂移光栅的面积调谐实验显示出相反的对比效果：当对比降低时，首选刺激直径会增加。这意味着从静态RF无法预测对比度对首选刺激大小的影响。 3）对比度适应减弱了对比度对RF幅度的影响，但并未显着改变RF宽度。 4）RF子区域重叠仅受到对比度和对比度适应变化的影响;当从子区域重叠处建立细胞时，将其分为简单和复杂两个分类，就对比度和适应状态的变化而言似乎很可靠。先前的研究表明，RF的时空特征在很大程度上取决于用于绘制RF的刺激。这项研究表明，对比度是有助于RF动力学的一项基本功能。

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