Differences in spatial and temporal frequency interactions between central and peripheral parts of the feline area 18.
Differences in spatial and temporal frequency interactions between central and peripheral parts of the feline area 18.
复制标题
猫科动物区域的中心部分和外围部分之间的空间和时间频率相互作用的差异 18.
DOI：
10.1111/ejn.13372
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发表时间：
2016
影响因子：
3.4
通讯作者：
Gang Wang
中科院分区：
文献类型：
--
作者：
Chunzhen Zhao;Jun-ya Okamura;Gang Wang
视觉系统在视野的中央和周边部分之间的信息处理能力表现出显着差异。基于内在信号的光学成像被用来研究与猫18区感受野偏心率相关的刺激空间和时间频率相互作用的差异。改变光栅刺激的空间或时间频率对对应于视野中心的皮层区域和在10度偏心率下的更外围部分的反应有显著影响。对应于注视中心的皮层区域被调谐到空间频率为0.4周/度（c/deg），时间频率为2 Hz。相反，对应于视野外围的皮层区域被调谐到0.15 c/deg的较低空间频率和4 Hz的较高时间频率。有趣的是，当我们同时改变光栅刺激的空间频率和时间频率时，响应与在对应于视野外围的皮层区域中的空间频率和时间频率之间的独立性的假设所估计的那些显著不同。然而，在与注视中心相对应的皮层区域中，空间频率显示出与时间频率的显著独立性。这些属性支持的概念，相对专业化的视觉信息处理的周边表示在皮层区域。
The visual system demonstrates significant differences in information processing abilities between the central and peripheral parts of the visual field. Optical imaging based on intrinsic signals was used to investigate the difference in stimulus spatial and temporal frequency interactions related to receptive field eccentricity in the cat area 18. Changing either the spatial or the temporal frequency of grating stimuli had a significant impact on responses in the cortical areas corresponding to the centre of the visual field and more peripheral parts at 10 degrees eccentricity. The cortical region corresponding to the centre of the gaze was tuned to 0.4 cycles per degree (c/deg) for spatial frequency and 2 Hz for temporal frequency. In contrast, the cortical region corresponding to the periphery of the visual field was tuned to a lower spatial frequency of 0.15 c/deg and a higher temporal frequency of 4 Hz. Interestingly, when we simultaneously changed both the spatial frequency and the temporal frequency of the grating stimuli, the responses were significantly different from those estimated with an assumption of independence between the spatial and temporal frequency in the cortical region corresponding to the periphery of the visual field. However, in the cortical area corresponding to the centre of the gaze, spatial frequency showed significant independence from temporal frequency. These properties support the notion of relative specialization of visual information processing for peripheral representations in cortical areas.