Rapid color categorization revealed by frequency-tagging-based EEG

IF 1.5 4区 心理学 Q4 NEUROSCIENCES Vision Research Pub Date : 2024-02-17 DOI:10.1016/j.visres.2024.108365
Mengdan Sun , Xiaoqing Gao
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Abstract

There has been much debate on whether color categories affect how we perceive color. Recent theories have put emphasis on the role of top-down influence on color perception that the original continuous color space in the visual cortex may be transformed into categorical encoding due to top-down modulation. To test the influence of color categories on color perception, we adopted an RSVP paradigm, where color stimuli were presented at a fast speed of 100 ms per stimulus and were forward and backward masked by the preceding and following stimuli. Moreover, no explicit color naming or categorization was required. In theory, backward masking with such a short interval in a passive viewing task should constrain top-down influence from higher-level brain areas. To measure any potentially subtle differences in brain response elicited by different color categories, we embedded a sensitive frequency-tagging-based EEG paradigm within the RSVP stimuli stream where the oddball color stimuli were encoded with a different frequency from the base color stimuli. We showed that EEG responses to cross-category oddball colors at the frequency where the oddball stimuli were presented was significantly larger than the responses to within-category oddball colors. Our study suggested that the visual cortex can automatically and implicitly encode color categories when color stimuli are presented rapidly.

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基于频率标记的脑电图揭示的快速颜色分类法
关于颜色类别是否会影响我们对颜色的感知,一直存在着很多争论。最近的理论强调了自上而下对色彩感知的影响,即视觉皮层中原有的连续色彩空间可能会由于自上而下的调制而转变为分类编码。为了测试颜色类别对颜色知觉的影响,我们采用了RSVP范式,即颜色刺激以每刺激100毫秒的速度快速呈现,并被前后刺激所遮蔽。此外,不需要明确的颜色命名或分类。从理论上讲,在被动观看任务中,如此短时间间隔的后向遮蔽应该会限制来自高级脑区的自上而下的影响。为了测量不同颜色类别可能引起的大脑反应的细微差别,我们在 RSVP 刺激流中嵌入了一个敏感的基于频率标记的脑电图范式,其中奇异颜色刺激的编码频率与基本颜色刺激的编码频率不同。我们的研究表明,在奇异球刺激出现的频率上,对跨类别奇异球颜色的脑电图反应明显大于对类别内奇异球颜色的反应。我们的研究表明,当颜色刺激快速呈现时,视觉皮层可以自动和隐式地编码颜色类别。
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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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