...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Computational Neuroscience >Contextual modulation of V1 receptive fields depends on their spatial symmetry
【24h】

Contextual modulation of V1 receptive fields depends on their spatial symmetry

机译：V1接收场的上下文调制取决于它们的空间对称性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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 rnsystematically, 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.
机译：感觉神经元的表观感受野特征取决于刺激集合的统计-一种非线性现象，通常称为情境调制。由于从简单刺激确定的视觉皮层感受野通常无法预测对复杂刺激的反应，因此了解情境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，我们检查了在第一和第二统计中匹配的两个刺激合奏的表观感受场如何不同，但是在它们的特征内容上却不同：一个合奏富含拉长的轮廓。为了确定整个神经种群的系统趋势，我们使用了多维标度方法，即Procrustes变换。我们发现，接收场成分的上下文调制随其空间范围的增加而增加。更令人惊讶的是，我们还发现奇数对称的成分在系统上发生了变化，而偶数对称的成分则没有变化。这种对称依赖性表明上下文调制是由定向的开/关二元组驱动的，即，对皮质内产生的信号强度的调制。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号