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首页> 外文期刊>The European Journal of Neuroscience >Temporal properties of colour opponent receptive fields in the cat lateral geniculate nucleus
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Temporal properties of colour opponent receptive fields in the cat lateral geniculate nucleus

机译：猫横向核细胞核中的彩色对手接收领域的时间特性

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摘要

The primordial form of mammalian colour vision relies on opponent interactions between inputs from just two cone types, ‘blue’ (S‐) and ‘green’ (ML‐) cones. We recently described the spatial receptive field structure of colour opponent blue‐ON cells from the lateral geniculate nucleus of cats. Functional inputs from the opponent cone types were spatially coextensive and equally weighted, supporting their high chromatic and low achromatic sensitivity. Here, we studied relative cone weights, temporal frequency tuning and visual latency of cat blue‐ON cells and non‐opponent achromatic cells to temporally modulated cone‐isolating and achromatic stimuli. We confirmed that blue‐ON cells receive equally weighted antagonistic inputs from S‐ and ML‐cones whereas achromatic cells receive exclusive ML‐cone input. The temporal frequency tuning curves of S‐ and ML‐cone inputs to blue‐ON cells were tightly correlated between 1 and 48 Hz. Optimal temporal frequencies of blue‐ON cells were around 3 Hz, whereas the frequency optimum of achromatic cells was close to 10 Hz. Most blue‐ON cells showed negligible response to achromatic flicker across all frequencies tested. Latency to visual stimulation was significantly greater in blue‐ON than in achromatic cells. The S‐ and ML‐cone responses of blue‐ON cells had on average, similar latencies to each other. Altogether, cat blue‐ON cells showed remarkable balance of opponent cone inputs. Our results also confirm similarities to primate blue‐ON cells suggesting that colour vision in mammals evolved on the basis of a sluggish pathway that is optimized for chromatic sensitivity at a wide range of spatial and temporal frequencies
机译：哺乳动物颜色视觉的原始形式依赖于只有两个锥形类型，“蓝色”（S-）和“绿色”（ML-）锥体之间的输入之间的对手相互作用。我们最近描述了来自猫的横向遗传细胞核的彩色对手蓝细胞的空间接收场结构。来自对手锥形类型的功能输入在空间上共同延伸和同样加权，支持其高色彩和低的消色差敏感性。这里，我们研究了猫蓝电池和非对手消色细胞的相对锥体重量，时间频率调谐和视觉等待时间，以时间地调节锥形隔离和消色差刺激。我们确认蓝色细胞从S-＆ML-CONES接收同等加权的拮抗输入，而占型电池接收独占ML-CONE输入。 S-和ML-CONE输入到蓝电池的时间频率调谐曲线在1到48Hz之间紧密相关。蓝色细胞的最佳时间频率约为3Hz，而无源细胞的频率最佳近于10Hz。大多数蓝色细胞对所有经过测试的所有频率的消色差闪烁响应可忽略不计。在蓝色上的视觉刺激的潜伏程度明显大于消色热细胞。蓝色细胞的S-和ML-CONE响应平均相似，彼此类似。完全，猫蓝电池显示出卓越的对手锥投入平衡。我们的结果还确认了灵长类动物蓝色细胞的相似之处，表明哺乳动物中的颜色视觉在伴随的途径上演变，这些途径在广泛的空间和时间频率下针对色度敏感性进行了优化

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