Endogenous attention enhances contrast appearance regardless of stimulus contrast

IF 1.7 4区 心理学 Q3 PSYCHOLOGY
Zi-Xi Luo, Wang-Nan Pan, Xiang-Jun Zeng, Liang-Yu Gong, Yong-Chun Cai
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引用次数: 0

Abstract

There has been enduring debate on how attention alters contrast appearance. Recent research indicates that exogenous attention enhances contrast appearance for low-contrast stimuli but attenuates it for high-contrast stimuli. Similarly, one study has demonstrated that endogenous attention heightens perceived contrast for low-contrast stimuli, yet none have explored its impact on high-contrast stimuli. In this study, we investigated how endogenous attention alters contrast appearance, with a specific focus on high-contrast stimuli. In Experiment 1, we utilized the rapid serial visual presentation (RSVP) paradigm to direct endogenous attention, revealing that contrast appearance was enhanced for both low- and high-contrast stimuli. To eliminate potential influences from the confined attention field in the RSVP paradigm, Experiment 2 adopted the letter identification paradigm, deploying attention across a broader visual field. Results consistently indicated that endogenous attention increased perceived contrast for high-contrast stimuli. Experiment 3 employed equiluminant chromatic letters as stimuli in the letter identification task to eliminate potential interference from contrast adaption, which might have occurred in Experiment 2. Remarkably, the boosting effect of endogenous attention persisted. Combining the results from these experiments, we propose that endogenous attention consistently enhances contrast appearance, irrespective of stimulus contrast levels. This stands in contrast to the effects of exogenous attention, suggesting that mechanisms through which endogenous attention alters contrast appearance may differ from those of exogenous attention.

Abstract Image

Abstract Image

无论刺激物的对比度如何,内源性注意力都会增强对比度的外观。
关于注意力如何改变对比度外观的争论由来已久。最近的研究表明,外源性注意会增强低对比度刺激物的对比度外观,但会减弱高对比度刺激物的对比度外观。同样,一项研究表明,内源性注意会增强低对比度刺激物的感知对比度,但没有任何研究探讨过内源性注意对高对比度刺激物的影响。在本研究中,我们研究了内源性注意如何改变对比度外观,并特别关注高对比度刺激。在实验 1 中,我们使用了快速序列视觉呈现(RSVP)范式来引导内源性注意,结果发现低对比度和高对比度刺激物的对比度外观都会增强。为了消除 RSVP 范式中有限注意区域的潜在影响,实验 2 采用了字母识别范式,在更广阔的视野中部署注意。结果一致表明,内源性注意增加了对高对比度刺激的感知对比度。实验 3 在字母识别任务中使用了等亮度的色度字母作为刺激物,以消除实验 2 中可能出现的对比度适应的潜在干扰。值得注意的是,内源性注意的增强效应依然存在。综合这些实验的结果,我们认为无论刺激物的对比度水平如何,内源性注意都会持续增强对比度的出现。这与外源性注意的效果形成鲜明对比,表明内源性注意改变对比度外观的机制可能与外源性注意不同。
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来源期刊
CiteScore
3.60
自引率
17.60%
发文量
197
审稿时长
4-8 weeks
期刊介绍: The journal Attention, Perception, & Psychophysics is an official journal of the Psychonomic Society. It spans all areas of research in sensory processes, perception, attention, and psychophysics. Most articles published are reports of experimental work; the journal also presents theoretical, integrative, and evaluative reviews. Commentary on issues of importance to researchers appears in a special section of the journal. Founded in 1966 as Perception & Psychophysics, the journal assumed its present name in 2009.
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