Tonic pupil size and its variability are sensitive to cognitive abilities (such as fluid intelligence [Gf]) among individuals. The present study aimed to examine this relationship in a new sample set (i.e., adolescents aged 11–14 years) with several important factors considered. We conducted two task‐free tasks (the blank‐screen viewing task and the scene viewing task) to measure tonic pupil size and its variability in 11–14‐year‐old adolescents with different Gf levels and preliminarily tested the role of task type and stimuli's luminance on this relationship. The results found that high‐Gf adolescents showed smaller tonic pupil size in both tasks but showed larger variability of tonic pupil size in the blank‐screen viewing task. Task type and stimuli's luminance could influence tonic pupil size and its variability in different ways. Cognitive and underlying neural mechanisms of these results are discussed to provide an explanation and suggestions for future studies.

中文翻译：

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补虚瞳孔大小及其变异性与11-14岁青少年的体液智力有关

补品的瞳孔大小及其变异性对个体之间的认知能力（例如流体智力[Gf]）敏感。本研究的目的是在考虑了几个重要因素的新样本集中（即11至14岁的青少年）检验这种关系。我们进行了两项无任务的任务（黑屏观看任务和场景观看任务），以测量不同Gf水平的11-14岁青少年的补品瞳孔大小及其变异性，并初步测试了任务类型和角色的作用。刺激在这种关系上的亮度。结果发现，高Gf青少年在两个任务中均显示较小的补品瞳孔大小，但在黑屏观看任务中显示出较大的补品瞳孔大小变化。任务类型和刺激的亮度可能以不同方式影响补品瞳孔大小及其变异性。