The temporal characteristics of the early and late stages of L- and M-cone pathways that signal brightness.

The temporal characteristics of the early and late stages of L- and M-cone pathways that signal brightness.
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表示亮度信号的 L 和 M 视锥细胞通路早期和晚期的时间特征。

DOI:
10.1167/13.7.15
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发表时间:
2013
期刊:
影响因子:
1.8
通讯作者:
Petrova D
Petrova D
中科院分区:
医学4区
文献类型:
--
作者:
Petrova D

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翻译后摘要:摘要闪烁560 nm的光显得更明亮,不饱和比稳定的光相同的平均强度。外观的变化与视觉信号在视觉通路内的一些非线性部位(或多个部位)处被扭曲一致,在这些部位处产生了新的时间分量,而不是原始波形的一部分。通过改变输入刺激来操纵这些新的时间成分-称为失真产品-并测量我们的观察者在检测它们时的灵敏度,我们得出了L-和M-视锥通路信号亮度的早期(前非线性)和晚期(后非线性)阶段的时间衰减特性。我们发现,早期的行为就像一个带通滤波器峰值在10-15 Hz的灵敏度损失在较低和较高的频率,而后期的行为就像一个两级低通滤波器的转折频率接近3 Hz。虽然亮度通常与快速消色差或亮度路径相关联,但这些滤波器特性,特别是后期滤波器的特性,与主要产生色度失真产品的LM色度路径的可比特征一致(Petrova,Henning和Stockman,2013)。非线性的一个合理位点是在水平细胞的环绕拮抗作用之后。建模表明,非线性的形式最初是可扩展的,但可能在最高输入电平处具有硬限制。
Abstract:Abstract Flickering 560-nm light appears brighter and less saturated than steady light of the same average intensity. The changes in appearance are consistent with the visual signal's being distorted at some nonlinear site (or sites) within the visual pathway at which new temporal components, not part of the original waveform, are produced. By varying the input stimulus to manipulate these new temporal components—called distortion products—and measuring our observers' sensitivity in detecting them, we derived the temporal attenuation characteristics of the early (prenonlinearity) and late (post-nonlinearity) stages of the L-and M-cone pathway that signals brightness. We found that the early stage acts like a band-pass filter peaking at 10–15 Hz with sensitivity losses at both lower and higher frequencies, whereas the late stage acts like a two-stage low-pass filter with a corner frequency near 3 Hz. Although brightness is often associated with the fast achromatic or luminance pathway, these filter characteristics, and particularly those of the late filter, are consistent with comparable features of the LM chromatic pathway that produce mainly chromatic distortion products (Petrova, Henning, & Stockman, 2013). A plausible site for the nonlinearity is after surround antagonism from horizontal cells. Modeling suggested the form of the nonlinearity to be initially expansive but possibly with a hard limit at the highest input levels.
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