![]() ![]() These files provide access to single-trial pupil size data and participant averages of those data. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: All data files supporting the results are available from the project’s Open Science Framework repository ( ). Received: FebruAccepted: JanuPublished: January 21, 2022Ĭopyright: © 2022 Franzen et al. ![]() PLoS ONE 17(1):Įditor: Manuel Spitschan, University of Oxford, UNITED KINGDOM These findings demonstrate that involuntary pupil size measurements combined with the presented paradigm are successful in dissociating cognitive effects of familiarity from physical stimulus confounds.Ĭitation: Franzen L, Cabugao A, Grohmann B, Elalouf K, Johnson AP (2022) Individual pupil size changes as a robust indicator of cognitive familiarity differences. However, amplitude differences were absent during the baseline period. These amplitude differences are present for almost all participants at the single-participant level, and vary somewhat by product category. Results show larger average and peak pupil dilation for passively viewed familiar product images and an extended later temporal component representing differences in familiarity across participants (starting around 1400 ms post-stimulus onset). We demonstrate its robustness in the context of pupillary responses to branded product familiarity. Here, building on previous research, we present a pupillometry paradigm that adapts the pupil to stimulus properties during the baseline period without revealing stimulus meaning or context by using a pixel-scrambled image mask around an intact image. Pupil size measurements, in particular, require sophisticated experimental designs to dissociate relatively small changes in pupil diameter due to cognitive responses from larger ones elicited by changes in stimulus properties or the experimental environment. However, their susceptibility to confounds introduced by stimulus properties, such as color and luminance, has limited their application. Cognitive psychology has a long history of using physiological measures, such as pupillometry. ![]()
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