Poster Session: Characterising colour processing in anomalous trichromacy with steady-state visually evoked potentials.

IF 2.3 4区 心理学 Q2 OPHTHALMOLOGY
Ana Rozman, Lucy P Somers, Jenny M Bosten
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引用次数: 0

Abstract

Colour vision is based on the capture of light by short (S), medium (M) and long (L) wavelength sensitive retinal cones. In postreceptoral colour processing, the outputs of the three cone types are first compared by two cone-opponent mechanisms, L/(L+M) and S/(L+M). In anomalous trichromacy, the separation between L and M cone peak spectral sensitivities is reduced compared to normal trichromacy, leading to decreased sensitivity for L/(L+M) colour differences. However, colour appearance is more similar to that of normal trichromats than cone-opponent models predict. Current evidence suggests this is due to postreceptoral compensation in the cortex, where reduced colour signals are amplified to use available neural resources. We devised a novel approach to investigate the site of postreceptoral compensation using steady-state visually evoked potentials (SSVEPs), captured by electroencephalography. We measured signals in response to flickering stimuli designed to isolate the S/(L+M) and L/(L+M) cone opponent mechanisms at both retinal and cortical sites. If compensation is cortical, we would expect any reduction for anomalous trichromats in retinal L/(L+M) SSVEP signals compared to S/(L+M) SSVEP signals to be rectified at the cortical site. Our study did not exclude the possibility of retinal compensation, in contrast to an existing fMRI study (Tregillus et al., 2021, Curr. Biol.). We present our novel method to address potential challenges in characterising these processes.

海报会议:用稳态视觉诱发电位表征异常三色的色彩处理。
色觉是基于对短(S)、中(M)和长(L)波长敏感的视网膜锥细胞对光的捕捉。在接受后颜色处理中,三种锥体类型的输出首先通过两种锥体对抗机制,L/(L+M)和S/(L+M)进行比较。在异常三色中,与正常三色相比,L和M锥峰光谱灵敏度之间的分离减少,导致L/(L+M)色差的灵敏度降低。然而,与锥体对抗模型预测的相比,颜色外观与正常三色视者更相似。目前的证据表明,这是由于皮层的后感受器补偿,在那里减少的颜色信号被放大,以利用可用的神经资源。我们设计了一种新的方法,利用脑电图捕获的稳态视觉诱发电位(SSVEPs)来研究感受器后代偿的位置。我们测量了闪烁刺激的信号响应,旨在分离视网膜和皮质部位的S/(L+M)和L/(L+M)锥体对抗机制。如果补偿是皮质的,我们预计与S/(L+M) SSVEP信号相比,视网膜L/(L+M) SSVEP信号中异常三色的任何减少都将在皮质部位得到纠正。与现有的功能磁共振成像研究(Tregillus et al., 2021, Curr.)相比,我们的研究没有排除视网膜代偿的可能性。杂志)。我们提出了我们的新方法来解决表征这些过程的潜在挑战。
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来源期刊
Journal of Vision
Journal of Vision 医学-眼科学
CiteScore
2.90
自引率
5.60%
发文量
218
审稿时长
3-6 weeks
期刊介绍: Exploring all aspects of biological visual function, including spatial vision, perception, low vision, color vision and more, spanning the fields of neuroscience, psychology and psychophysics.
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