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Comput.-Hum. Interact."],"published-print":{"date-parts":[[2016,2,20]]},"abstract":"<jats:p>In this article, we evaluate<jats:italic>b-Reactable<\/jats:italic>, a digital music instrument that combines implicit physiology-based interaction through EEG and ECG, and explicit gestural interaction for sound generation and control. This multimodality is embodied in tangible objects named<jats:italic>physiopucks,<\/jats:italic>which are driven by biosignals. We hypothesize that multimodality increases users\u2019 motivation in a musical task, compared to the use of a gesture-only tabletop system (the Reactable). We compared motivational aspects in dyads collaborating in three experimental groups (N = 56): the Physio group (one physiology- and one gesture-based user), the Sham group (one prerecorded physiology- and one gesture-based user), and the Control group (two gesture users). Between-group comparisons showed that motivation dimensions of Confidence and Satisfaction were higher in<jats:italic>b-Reactable<\/jats:italic>than in the gesture-only tangible interface, and that fake physiology-based feedback significantly reduced these effects. Our study also shows the potential of combined implicit and explicit interaction modes in multiuser HCI scenarios.<\/jats:p>","DOI":"10.1145\/2838732","type":"journal-article","created":{"date-parts":[[2016,2,22]],"date-time":"2016-02-22T13:07:16Z","timestamp":1456146436000},"page":"1-22","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["<i>Physiopucks<\/i>"],"prefix":"10.1145","volume":"23","author":[{"given":"S. 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