V1 neurons respond to luminance changes faster than contrast changes.
V1 neurons respond to luminance changes faster than contrast changes.
复制标题
V1 神经元对亮度变化的响应速度快于对比度变化的响应速度
DOI：
10.1038/srep17173
复制
发表时间：
2015-12-04
影响因子：
4.6
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Wang WL;Li R;Ding J;Tao L;Li DP;Wang Y
亮度和对比度是视觉场景中物体的两个主要属性。视觉神经元接收到的亮度和对比度信息通常同时更新。我们检查了初级视觉皮层（V1）神经元对亮度和对比度同时改变 50Hz 的刺激的时间响应特性。我们发现对亮度变化的响应调整先于对 V1 对比度变化的调整。对于大多数 V1 神经元，对亮度变化的响应调整的起始时间比对对比度变化的响应调整的起始时间短。大多数神经元在早期反应阶段携带亮度信息，而所有神经元在晚期反应阶段都携带对比度和亮度信息。早期的亮度响应表明，皮质对亮度的处理并不像之前想象的那么慢。
Luminance and contrast are two major attributes of objects in the visual scene. Luminance and contrast information received by visual neurons are often updated simultaneously. We examined the temporal response properties of neurons in the primary visual cortex (V1) to stimuli whose luminance and contrast were simultaneously changed by 50 Hz. We found that response tuning to luminance changes precedes tuning to contrast changes in V1. For most V1 neurons, the onset time of response tuning to luminance changes was shorter than that to contrast changes. Most neurons carried luminance information in the early response stage, while all neurons carried both contrast and luminance information in the late response stage. The early luminance response suggests that cortical processing for luminance is not as slow as previously thought.