Sensory adaptation as optimal resource allocation
Sensory adaptation as optimal resource allocation
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DOI：
10.1073/pnas.1204109110
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发表时间：
2013-03-12
影响因子：
11.1
通讯作者：
Albright, Thomas D.
中科院分区：
文献类型：
--
作者：
Gepshtein, Sergei;Lesmes, Luis A.;Albright, Thomas D.
视觉适应有望提高新环境下的视觉表现。这一预期与以下证据相矛盾：适应有时会降低对适应刺激的敏感性，有时会改变对与适应刺激截然不同的刺激的敏感性。我们假设，这种模式的结果可以解释为一个过程，优化敏感性的许多刺激，而不是改变敏感性只为那些刺激的统计数据发生了变化。为了验证这一假设，我们测量了视觉灵敏度在广泛的时空调制的亮度，而不同的刺激速度的分布。刺激统计的操纵引起了视觉敏感性的大规模重组，形成了敏感性增益和损失的有序模式。这种模式是由视觉系统中感受野特征分布理论预测的。
Visual adaptation is expected to improve visual performance in the new environment. This expectation has been contradicted by evidence that adaptation sometimes decreases sensitivity for the adapting stimuli, and sometimes it changes sensitivity for stimuli very different from the adapting ones. We hypothesize that this pattern of results can be explained by a process that optimizes sensitivity for many stimuli, rather than changing sensitivity only for those stimuli whose statistics have changed. To test this hypothesis, we measured visual sensitivity across a broad range of spatiotemporal modulations of luminance, while varying the distribution of stimulus speeds. The manipulation of stimulus statistics caused a large-scale reorganization of visual sensitivity, forming the orderly pattern of sensitivity gains and losses. This pattern is predicted by a theory of distribution of receptive field characteristics in the visual system.