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Despite the ubiquity of such situations, there remains a gap in our understanding of how decision\u2010making unfolds in social contexts, and how communicative signals, such as social cues and feedback, impact the choices we make. Interestingly, there is a new social context to which humans are recently increasingly more frequently exposed\u2014social interaction with not only other humans but also artificial agents, such as robots or avatars. Given these new technological developments, it is of great interest to address the question of whether\u2014and in what way\u2014social signals exhibited by non\u2010human agents influence decision\u2010making. The present study aimed to examine whether robot non\u2010verbal communicative behavior has an effect on human decision\u2010making. To this end, we implemented a two\u2010alternative\u2010choice task where participants were to guess which of two presented cups was covering a ball. This game was an adaptation of a \u201cShell Game.\u201d A robot avatar acted as a game partner producing social cues and feedback. We manipulated robot's cues (pointing toward one of the cups) before the participant's decision and the robot's feedback (\u201cthumb up\u201d or no feedback) after the decision. We found that participants were slower (compared to other conditions) when cues were mostly invalid and the robot reacted positively to wins. We argue that this was due to the incongruence of the signals (cue vs. feedback), and thus violation of expectations. In sum, our findings show that incongruence in pre\u2010 and post\u2010decision social signals from a robot significantly influences task performance, highlighting the importance of understanding expectations toward social robots for effective human\u2013robot interactions.<\/jats:p>","DOI":"10.1111\/cogs.13393","type":"journal-article","created":{"date-parts":[[2023,12,22]],"date-time":"2023-12-22T10:43:24Z","timestamp":1703241804000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Differences in Social Expectations About Robot Signals and Human Signals"],"prefix":"10.1111","volume":"47","author":[{"given":"Lorenzo","family":"Parenti","sequence":"first","affiliation":[{"name":"Social Cognition in Human\u2010Robot Interaction Istituto Italiano di Tecnologia (IIT)"},{"name":"Department of Psychology University of Turin"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marwen","family":"Belkaid","sequence":"additional","affiliation":[{"name":"Social Cognition in Human\u2010Robot Interaction Istituto Italiano di Tecnologia (IIT)"},{"name":"ETIS UMR 8051 CY Cergy Paris Universit\u00e9, ENSEA, CNRS"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Agnieszka","family":"Wykowska","sequence":"additional","affiliation":[{"name":"Social Cognition in Human\u2010Robot Interaction Istituto Italiano di Tecnologia (IIT)"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,12,22]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.3389\/fpsyg.2017.01393"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.3389\/fpsyg.2020.02234"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.3758\/s13415-021-00895-9"},{"key":"e_1_2_8_5_1","doi-asserted-by":"crossref","unstructured":"Abubshait A. 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