Differences in orientation tuning between pinwheel and domain neurons in primary visual cortex depend on contrast and size

文献类型： 外文期刊

第一作者： Liu, Yong-Jun

作者： Liu, Yong-Jun;Hashemi-Nezhad, Maziar;Lyon, David C.;Liu, Yong-Jun;Hashemi-Nezhad, Maziar;Hashemi-Nezhad, Maziar

作者机构：

关键词： contrast invariance;feedback;horizontal connections;optical imaging;orientation map;orientation selectivity;surround suppression;V1

期刊名称：NEUROPHOTONICS （ 影响因子：3.593； 五年影响因子：4.327 ）

ISSN： 2329-423X

年卷期： 2017 年 4 卷 3 期

页码：

收录情况： SCI

摘要： Intrinsic signal optical imaging reveals a highly modular map of orientation preference in the primary visual cortex (V1) of several species. This orientation map is characterized by domains and pinwheels where local circuitry is either more or less orientation selective, respectively. It has now been repeatedly demonstrated that neurons in pinwheels tend to be more broadly tuned to orientation, likely due to the broad range of orientation preference of the neighboring neurons forming pinwheels. However, certain stimulus conditions, such as a decrease in contrast or an increase in size, significantly sharpen tuning widths of V1 neurons. Here, we find that pinwheel neuron tuning widths are broader than domain neurons only for high contrast, optimally sized stimuli, conditions that maximize excitation through feedforward, and local cortical processing. When contrast was lowered or size increased, orientation tuning width sharpened and became equal. These latter conditions are conducive to less local excitation either through lower feedforward drive or by surround suppression arising from long-range cortical circuits. Tuning width differences between pinwheel and domain neurons likely arise through more local circuitry and are overcome through recruitment of longer-range cortical circuits. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)

分类号：

  • 相关文献

[1]Land use/cover change and regional climate change in an arid grassland ecosystem of Inner Mongolia, China. Li, Zhouyuan,Wu, Wenzhao,Liu, Xuehua,Liu, Xinchao,Li, Zhouyuan,Wu, Wenzhao,Liu, Xuehua,Liu, Xinchao,Li, Zhouyuan,Fath, Brian D.,Sun, Hailian,Liu, Xinchao,Sun, Hailian,Liu, Xinchao,Xiao, Xinru,Cao, Jun.

作者其他论文 更多>>

微信小程序