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Robot. AI"],"abstract":"<jats:p>Friendship and rapport play an important role in the formation of constructive social interactions, and have been widely studied in education due to their impact on learning outcomes. Given the growing interest in automating the analysis of such phenomena through Machine Learning, access to annotated interaction datasets is highly valuable. However, no dataset on child-child interactions explicitly capturing rapport currently exists. Moreover, despite advances in the automatic analysis of human behavior, no previous work has addressed the prediction of rapport in child-child interactions in educational settings. We present UpStory \u2014 the Uppsala Storytelling dataset: a novel dataset of naturalistic dyadic interactions between primary school aged children, with an experimental manipulation of rapport. Pairs of children aged 8\u201310 participate in a task-oriented activity: designing a story together, while being allowed free movement within the play area. We promote balanced collection of different levels of rapport by using a within-subjects design: self-reported friendships are used to pair each child twice, either minimizing or maximizing pair separation in the friendship network. The dataset contains data for 35 pairs, totaling 3 h 40 m of audiovisual recordings. It includes two video sources, and separate voice recordings per child. An anonymized version of the dataset is made publicly available, containing per-frame head pose, body pose, and face features. Finally, we confirm the informative power of the UpStory dataset by establishing baselines for the prediction of rapport. A simple approach achieves 68% test accuracy using data from one child, and 70% test accuracy aggregating data from a pair.<\/jats:p>","DOI":"10.3389\/frobt.2025.1547578","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T13:13:29Z","timestamp":1753103609000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["UpStory: the uppsala storytelling dataset"],"prefix":"10.3389","volume":"12","author":[{"given":"Marc","family":"Fraile","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natalia","family":"Calvo-Barajas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anastasia Sophia","family":"Apeiron","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giovanna","family":"Varni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joakim","family":"Lindblad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nata\u0161a","family":"Sladoje","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ginevra","family":"Castellano","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2025,7,21]]},"reference":[{"key":"B1","doi-asserted-by":"crossref","first-page":"063","DOI":"10.1109\/ICAIIC51459.2021.9415271","article-title":"Effects of annotation quality on model performance","volume-title":"2021 international conference on artificial intelligence in information and communication (ICAIIC)","author":"Alhazmi","year":"2021"},{"key":"B2","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1145\/3462244.3479905","article-title":"Attachment recognition in school age children based on automatic analysis of facial expressions and nonverbal vocal behaviour","volume-title":"Proceedings of the 2021 international conference on multimodal interaction","author":"Alsofyani","year":"2021"},{"key":"B3","doi-asserted-by":"publisher","first-page":"596","DOI":"10.1037\/0022-3514.63.4.596","article-title":"Inclusion of other in the self scale and the structure of interpersonal closeness","volume":"63","author":"Aron","year":"1992","journal-title":"J. personality Soc. 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