{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T08:58:32Z","timestamp":1765961912141,"version":"build-2065373602"},"reference-count":120,"publisher":"Association for Computing Machinery (ACM)","issue":"7","content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["Proc. ACM Hum.-Comput. Interact."],"published-print":{"date-parts":[[2025,10,18]]},"abstract":"<jats:p>In networked virtual reality (VR), user behaviors, individual differences, and group dynamics can serve as important signals for future speech behaviors, such as who the next speaker will be and the timing of turn-taking behaviors. The ability to predict and understand these behaviors offers opportunities to provide adaptive and personalized assistance, for example helping users with varying sensory abilities navigate complex social scenes and instantiating virtual moderators with natural behaviors. In this work, we predict turn-taking behaviors using features extracted based on social dynamics literature. We discuss results from a large-scale VR classroom dataset consisting of 77 sessions and 1660 minutes of small-group social interactions collected over four weeks. In our evaluation, gradient boosting classifiers achieved the best performance, with accuracies of 0.71-0.78 AUC (area under the ROC curve) across three tasks concerning the ''what'', ''who'', and ''when'' of turn-taking behaviors. In interpreting these models, we found that group size, listener personality, speech-related behavior (e.g., time elapsed since the listener's last speech event), group visual attention (e.g., the group's head orientation towards the speaker), and the listener and previous speaker's head pitch, head y-axis position, and left hand y-axis position more saliently influenced predictions. Results suggested that these features remain reliable indicators in novel social VR settings, as prediction performance is robust over time and with groups and activities not used in the training dataset. We discuss theoretical and practical implications of the work.<\/jats:p>","DOI":"10.1145\/3757498","type":"journal-article","created":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T17:32:00Z","timestamp":1760635920000},"page":"1-40","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Predicting and Understanding Turn-Taking Behavior in Open-Ended Group Activities in Virtual Reality"],"prefix":"10.1145","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1704-5718","authenticated-orcid":false,"given":"Portia","family":"Wang","sequence":"first","affiliation":[{"name":"Stanford University, Stanford, CA, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1066-6186","authenticated-orcid":false,"given":"Eugy","family":"Han","sequence":"additional","affiliation":[{"name":"Stanford University, Stanford, CA, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1032-1628","authenticated-orcid":false,"given":"Anna C.M.","family":"Queiroz","sequence":"additional","affiliation":[{"name":"Stanford University, Stanford, CA, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2655-9841","authenticated-orcid":false,"given":"Cyan","family":"DeVeaux","sequence":"additional","affiliation":[{"name":"Stanford University, Stanford, CA, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2813-3297","authenticated-orcid":false,"given":"Jeremy N.","family":"Bailenson","sequence":"additional","affiliation":[{"name":"Stanford University, Stanford, CA, USA"}]}],"member":"320","published-online":{"date-parts":[[2025,10,16]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/3479597"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/3584931.3606968"},{"key":"e_1_2_1_3_1","volume-title":"Eye gaze as a cue for recognizing intention and coordinating joint action. 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