Niimi Ryosuke
Faculty of Humanities, Niigata University, Niigata, Japan.
Psychophysiology. 2025 Feb;62(2):e70007. doi: 10.1111/psyp.70007.
This study examined whether pupil size varies as a function of the memorability of natural scene images. In Experiment 1, participants were asked to memorize, recognize, and passively view high- and low-memorability images from an established dataset. The baseline-corrected pupil sizes were larger for high-memorability images, but only during old trials in the recognition phase. However, after implementing stricter controls for image luminance and arousal, pupil dilation for high-memorability images was observed across all phases: memorization, recognition, and passive viewing (Experiments 2 and 3). The effect of image memorability was further validated through item-based analysis. Both the pupil old/new effect and the subsequent memory effect were replicated, and these effects are probably separable from the effect of image memorability. The results of this study suggest that pupil size is sensitive to image memorability regardless of the behavioral task, supporting the view that image memorability is an intrinsic, higher-order property of the image.
本研究考察了瞳孔大小是否会随着自然场景图像的可记忆性而变化。在实验1中，参与者被要求记忆、识别并被动观看来自一个既定数据集的高可记忆性和低可记忆性图像。经基线校正后，高可记忆性图像的瞳孔尺寸更大，但仅在识别阶段的旧试验中如此。然而，在对图像亮度和唤醒水平实施更严格的控制后，在所有阶段（记忆、识别和被动观看）都观察到了高可记忆性图像的瞳孔扩张（实验2和3）。通过基于项目的分析进一步验证了图像可记忆性的影响。瞳孔新旧效应和随后的记忆效应均得到了重复，并且这些效应可能与图像可记忆性的效应是可分离的。本研究结果表明，无论行为任务如何，瞳孔大小对图像可记忆性都很敏感，这支持了图像可记忆性是图像的一种内在的、高阶属性的观点。
