在初级视觉皮层中,对色度刺激和消色刺激的 fMRI 反应相互依存,并可预测对比度检测阈值

IF 1.5 4区 心理学 Q4 NEUROSCIENCES
Rebecca Lowndes , Richard Aveyard , Lauren E. Welbourne , Alex Wade , Antony B. Morland
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引用次数: 0

摘要

初级视觉皮层中的色信号和消色信号历来被认为是相互独立的,但后来有证据表明它们是相互依存的。在这里,我们研究了刺激的两个组成部分的组合:一个消色动态变化的检查背景和一个色度(L-M 或 S 锥)目标光栅。我们发现,初级视觉皮层中色度信号和消色度信号的组合是相互依存的,随着消色度对比度的增加,色度对比度反应的动态范围会减小。对比度检测阈值研究也揭示了背景和目标之间的相互依存关系,随着消色背景对比度的增加,色对比度检测阈值也随之增加。一个包含了消色对比度对色度反应的归一化效应(反之亦然)的模型最能预测我们的 V1 数据和行为阈值。在视觉层次结构中,与消色差反应相比,色差反应的动态范围保持不变,而消色差反应则变得越来越压抑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In primary visual cortex fMRI responses to chromatic and achromatic stimuli are interdependent and predict contrast detection thresholds

Chromatic and achromatic signals in primary visual cortex have historically been considered independent of each other but have since shown evidence of interdependence. Here, we investigated the combination of two components of a stimulus; an achromatic dynamically changing check background and a chromatic (L-M or S cone) target grating. We found that combinations of chromatic and achromatic signals in primary visual cortex were interdependent, with the dynamic range of responses to chromatic contrast decreasing as achromatic contrast increased. A contrast detection threshold study also revealed interdependence of background and target, with increasing chromatic contrast detection thresholds as achromatic background contrast increased. A model that incorporated a normalising effect of achromatic contrast on chromatic responses, but not vice versa, best predicted our V1 data as well as behavioural thresholds. Further along the visual hierarchy, the dynamic range of chromatic responses was maintained when compared to achromatic responses, which became increasingly compressive.

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来源期刊
Vision Research
Vision Research 医学-神经科学
CiteScore
3.70
自引率
16.70%
发文量
111
审稿时长
66 days
期刊介绍: Vision Research is a journal devoted to the functional aspects of human, vertebrate and invertebrate vision and publishes experimental and observational studies, reviews, and theoretical and computational analyses. Vision Research also publishes clinical studies relevant to normal visual function and basic research relevant to visual dysfunction or its clinical investigation. Functional aspects of vision is interpreted broadly, ranging from molecular and cellular function to perception and behavior. Detailed descriptions are encouraged but enough introductory background should be included for non-specialists. Theoretical and computational papers should give a sense of order to the facts or point to new verifiable observations. Papers dealing with questions in the history of vision science should stress the development of ideas in the field.
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