Speed of visual processing increases with eccentricity
Speed of visual processing increases with eccentricity
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DOI：
10.1038/nn1079
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发表时间：
2003-07-01
影响因子：
25
通讯作者：
Giordano, AM
中科院分区：
文献类型：
--
作者：
Carrasco, M;McElree, B;Giordano, AM
视觉系统具有双重设计，以满足相互冲突的环境需求：中央凹具有处理精细空间信息所需的分辨率，但外围对时间属性更敏感（1-3）。为了研究周边的敏感性是否部分归因于信息处理的速度，我们通过推导可辨别性和速度的联合测量来测量视觉信息处理的全时间过程，发现信息处理速度随偏心量的变化而变化：当相同大小的刺激出现在9度时，加工速度比出现在4度时快，当9度刺激放大到与皮层表征大小相等时，这种差异减弱。在相同的偏心率下，更大的刺激被处理得更慢。这些时间差异比神经生理限制所预期的要大（4-6）。
The visual system has a duplex design to meet conflicting environmental demands: the fovea has the resolution required to process fine spatial information, but the periphery is more sensitive to temporal properties(1-3). To investigate whether the periphery's sensitivity is partly due to the speed with which information is processed, we measured the full timecourse of visual information processing by deriving joint measures of discriminability and speed, and found that speed of information processing varies with eccentricity: processing was faster when same-size stimuli appeared at 9degrees than 4degrees eccentricity, and this difference was attenuated when the 9degrees stimuli were magnified to equate cortical representation size. At the same eccentricity, larger stimuli are processed more slowly. These temporal differences are greater than expected from neurophysiological constraints(4-6).