Contrast induced changes in response latency depend on stimulus specificity
Contrast induced changes in response latency depend on stimulus specificity
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DOI：
10.1016/j.jphysparis.2009.11.021
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发表时间：
2010-05-01
影响因子：
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通讯作者：
Oram, Mike W.
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文献类型：
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作者：
Oram, Mike W.
视皮层神经元的反应潜伏期随刺激对比度的降低而增加。来自下颞叶皮层（IT）和上级颞沟（STS）神经元的神经生理学记录表明，随着刺激对比度的降低，在高级视觉区中的反应潜伏期的增加比在初级视觉皮层中看到的要大得多。这表明大部分潜伏期变化不是视网膜或V1的起源，而是每个皮层处理区域在低对比度下增加了潜伏期。我表明，在早期的视觉领域，反应潜伏期更强烈地依赖于刺激的对比度比刺激的身份。随着刺激对比度的降低，反应潜伏期的增加程度有很大的变化。我表明，这种细胞之间的变异性，至少在一定程度上，与刺激特异性的神经元：增加反应潜伏期作为刺激对比度降低是更大的神经元，响应于几个刺激相比，神经元，响应于许多刺激。(C)2009爱思唯尔有限公司保留所有权利。
Neurones in visual cortex show increasing response latency with decreasing stimulus contrast. Neurophysiological recordings from neurones in inferior temporal cortex (IT) and the superior temporal sulcus (STS), show that the increment in response latency with decreasing stimulus contrast is considerably greater in higher visual areas than that seen in primary visual cortex. This suggests that the majority of the latency change is not retinal or V1 in origin, instead each cortical processing area adds latency at low contrast. I show that, as in earlier visual areas, response latency is more strongly dependent on stimulus contrast than stimulus identity. There is large variation in the extent to which response latency increases with decreasing stimulus contrast. I show that this between cell variability is, at least in part, related to the stimulus specificity of the neurones: the increase in response latency as stimulus contrast decreases is greater for neurones that respond to few stimuli compared to neurones that respond to many stimuli. (C) 2009 Elsevier Ltd. All rights reserved.