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Sensations from a single M-cone depend on the activity of surrounding S-cones

机译:来自单个M锥的感觉取决于周围S锥的活动

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摘要

Color vision requires the activity of cone photoreceptors to be compared in post-receptoral circuitry. Decades of psychophysical measurements have quantified the nature of these comparative interactions on a coarse scale. How such findings generalize to a cellular scale remains unclear. To answer that question, we quantified the influence of surrounding light on the appearance of spots targeted to individual cones. The eye’s aberrations were corrected with adaptive optics and retinal position was precisely tracked in real-time to compensate for natural movement. Subjects reported the color appearance of each spot. A majority of L-and M-cones consistently gave rise to the sensation of white, while a smaller group repeatedly elicited hue sensations. When blue sensations were reported they were more likely mediated by M- than L-cones. Blue sensations were elicited from M-cones against a short-wavelength light that preferentially elevated the quantal catch in surrounding S-cones, while stimulation of the same cones against a white background elicited green sensations. In one of two subjects, proximity to S-cones increased the probability of blue reports when M-cones were probed. We propose that M-cone increments excited both green and blue opponent pathways, but the relative activity of neighboring cones favored one pathway over the other.
机译:色觉要求在受体后电路中比较视锥细胞感光器的活性。数十年来的心理物理测量已在较粗略的范围内量化了这些比较性相互作用的性质。这些发现如何推广到细胞规模尚不清楚。为了回答这个问题,我们量化了周围光线对以单个圆锥体为目标的斑点外观的影响。眼睛的像差已通过自适应光学系统进行了校正,并且可以实时精确跟踪视网膜位置,以补偿自然运动。受试者报告了每个斑点的颜色外观。大多数L-和M-圆锥一致地引起白色的感觉,而一小群反复引起色调的感觉。当报道蓝色感觉时,它们更可能是由M-而不是L-锥介导的。在短波长光下,M锥会产生蓝色感,优先提高周围S锥的定量捕获,而在白色背景下刺激相同的视锥则会引起绿色感。在两个对象之一中,当探测M锥时,靠近S锥会增加出现蓝色报告的可能性。我们提出,M-圆锥体的增量会激发绿色和蓝色的对手途径,但是相邻锥体的相对活性偏向于一种途径。

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