Contextual modulation of V1 receptive fields depends on their spatial symmetry.
Contextual modulation of V1 receptive fields depends on their spatial symmetry.
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DOI：
10.1007/s10827-008-0107-5
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发表时间：
2009-04
影响因子：
1.2
通讯作者：
Victor, Jonathan D.
中科院分区：
文献类型：
--
作者：
Sharpee, Tatyana O.;Victor, Jonathan D.
感觉神经元的明显感受野特征取决于刺激集合的统计数据-一种通常被称为上下文调制的非线性现象。由于由简单刺激确定的视觉皮质感受野通常不能预测对复杂刺激的反应，因此理解上下文调制对于理解对自然场景的反应至关重要。为了分析上下文调制，我们研究了两个刺激合奏，在一阶和二阶统计相匹配，但在其特征内容不同的明显感受野不同：一个合奏是丰富的细长轮廓。为了识别整个神经群体的系统趋势，我们使用了多维尺度方法，即Procrustes变换。我们发现，上下文调制的感受野组件增加其空间范围。更令人惊讶的是，我们还发现，奇对称组件系统地改变，但偶对称组件没有。这种对称依赖性表明，上下文调制是由定向的开关二进制驱动的，即，调节皮质内产生的信号的强度。
The apparent receptive field characteristics of sensory neurons depend on the statistics of the stimulus ensemble – a nonlinear phenomenon often called contextual modulation. Since visual cortical receptive fields determined from simple stimuli typically do not predict responses to complex stimuli, understanding contextual modulation is crucial to understanding responses to natural scenes. To analyze contextual modulation, we examined how apparent receptive fields differ for two stimulus ensembles that are matched in first- and second-order statistics, but differ in their feature content: one ensemble is enriched in elongated contours. To identify systematic trends across the neural population, we used a multidimensional scaling method, the Procrustes transformation. We found that contextual modulation of receptive field components increases with their spatial extent. More surprisingly, we also found that odd-symmetric components change systematically, but even-symmetric components do not. This symmetry dependence suggests that contextual modulation is driven by oriented on-off dyads, i.e., modulation of the strength of intracortically-generated signals.
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