The influence of pupil responses on subjective brightness perception.

The influence of pupil responses on subjective brightness perception.
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DOI:
10.1177/03010066221094757
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发表时间:
2022-06
期刊:
影响因子:
1.7
通讯作者:
Mathot, S.
Mathot, S.
中科院分区:
心理学4区
文献类型:
--
作者:
Wardhani, I. K.;Boehler, C. N.;Mathot, S.

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When the pupil dilates, the amount of light that falls onto the retina increases. However, in daily life, this does not make the world look brighter. Here we asked whether pupil size (resulting from active pupil movement) influences subjective brightness in the absence of indirect cues that, in daily life, support brightness constancy. We measured the subjective brightness of a tester stimulus relative to a referent as a function of pupil size during tester presentation. In Experiment 1, we manipulated pupil size through a secondary working-memory task (larger pupils with higher load and after errors). We found some evidence that the tester was perceived as darker, rather than brighter, when pupils were larger. In Experiment 2, we presented a red or blue display (larger pupils following red displays). We again found that the tester was perceived as darker when pupils were larger. We speculate that the visual system takes pupil size into account when making brightness judgments. Finally, we highlight the challenges associated with manipulating pupil size. In summary, the current study (as well as a recent pharmacological study on the same topic by another team) is intriguing first steps towards understanding the role of pupil size in brightness perception.
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