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. 2023 Jun 29;13:10516. doi: 10.1038/s41598-023-37209-7

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Illustration of key moments in study flow. (a) Face-Tracking calibration. Participants were presented with the preview of the face tracking algorithm with facial coordinates overlayed over their web-camera input in real time, followed by a screen showing only their facial coordinates; (b) Training trials for reporting the momentary engagement in Experience Sampling Condition; (c) Media Player as seen by participants, featuring a still from the stimulus play The Bullet and The Bass Trombone and response scale visible. Participants in the Control Condition were not presented with training trials (b) and response scale (lower right).