环绕遮蔽揭示双目加法和差分通道

IF 1.5 4区 心理学 Q4 NEUROSCIENCES
Rinku Sarkar , Kiana Zanetti , Alexandre Reynaud , Frederick A.A. Kingdom
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引用次数: 0

摘要

最近的研究表明,双眼相加 S+ 通道和相差 S- 通道在双眼视觉中发挥着重要作用。为了在双眼对比检测和双眼相加的背景下测试这种作用,我们采用了一种环绕遮蔽范式,包括一个由遮蔽环包围的中央目标圆盘。所有刺激均为水平方向的0.5c/d正弦光栅。相关刺激物的眼间空间相位相同,而反相关刺激物的眼间空间相位相反。共有四种目标条件:单眼左视、单眼右视、双眼相关和双眼反相关,以及三种环绕遮罩条件:无环绕、双眼相关和双眼反相关。我们观察到,在两种双目环绕遮罩条件下,单目和双目目标的检测阈值一致升高。此外,我们还发现了环绕类型和双目目标类型之间的交互作用:环绕遮罩和具有相反眼间相位关系的目标会相对提高检测和求和能力,而环绕遮罩和具有相同眼间相位关系的目标则会降低检测和求和能力。一个被称为 MAX (S+S-) 的双目组合模型对这些数据进行了合理的解释,在该模型中,决策变量是建模的 S+ 和 S- 通道反应的概率相加,一个自由参数决定了两个通道的相对增益。我们的研究结果表明,在双眼组合中存在两个通道,即 S+ 和 S-,它们的相对增益可根据周围环境进行调整。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Surround masking reveals binocular adding and differencing channels

Surround masking reveals binocular adding and differencing channels

Recent studies suggest that binocular adding S+ and differencing S- channels play an important role in binocular vision. To test for such a role in the context of binocular contrast detection and binocular summation, we employed a surround masking paradigm consisting of a central target disk surrounded by a mask annulus. All stimuli were horizontally oriented 0.5c/d sinusoidal gratings. Correlated stimuli were identical in interocular spatial phase while anticorrelated stimuli were opposite in interocular spatial phase. There were four target conditions: monocular left eye, monocular right eye, binocular correlated and binocular anticorrelated, and three surround mask conditions: no surround, binocularly correlated and binocularly anticorrelated. We observed consistent elevation of detection thresholds for monocular and binocular targets across the two binocular surround mask conditions. In addition, we found an interaction between the type of surround and the type of binocular target: both detection and summation were relatively enhanced by surround masks and targets with opposite interocular phase relationships and reduced by surround masks and targets with the same interocular phase relationships. The data were reasonably well accounted for by a model of binocular combination termed MAX (S+S-), in which the decision variable is the probability summation of modeled S+ and S- channel responses, with a free parameter determining the relative gains of the two channels. Our results support the existence of two channels involved in binocular combination, S+ and S-, whose relative gains are adjustable by surround context.

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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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