Abstract
Social cues have been construed as an important concept in human–robot interaction, as they can be manipulated to reflect robots’ perceived genders, personalities, emotions, identities, and so on. This study seeks to understand the overall effects of social cues and applies two meta-analyses to explore a hierarchy of social cues that elicits different degrees of users’ social responses. A total of 25 and 44 effect sizes were calculated to represent the respective magnitudes of the effects of social cues on users’ social presence (N = 2498) and trust in social robots (N = 4147). Results suggested that although the overall effects of social cues were small, manipulating social robots’ facial and kinetic cues can induce medium-to-large-sized effects on users’ social presence and trust. In addition, the overall positive effect sizes of social cues indicated that designing humanlike, natural, and lifelike cues was effective in evoking users’ social presence and trust in social robots. The results of the two meta-analyses can contribute to the theoretical implications of the Computers are Social Actors paradigm and the practical and methodological design of human–robot interaction.
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The datasets generated during the current study are available from the corresponding author on reasonable request. Some data have already been included in this article (Appendices).
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Appendix 1a
See Table 6.
Appendix 1b
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Appendix 2
3.1 Publication Bias
To identify a potential “file-drawer-problem” that may lead to the overestimation of the overall effect of pooled relationships, a common method to detect publication bias is Rosenthal’s [104] approach of fail-safe n calculation. This approach is to compare the value of “fail-safe n bias” and “fail-safe n.” If the fail-safe n is larger than the fail-safe n bias, then the meta-analysis features no publication bias. By contrast, if the fail-safe n is smaller than the fail-safe n bias, it indicates a potential bias of the meta-analysis. In this study, R package metaphor revealed that the fail-safe n is 4066. Under the zero-coded condition, the fail-safe n bias was 355. Under the max-coded condition, the fail-safe n bias was 295. In both conditions, the fail-safe n bias was smaller than the fail-safe n, meaning that this meta-analysis presented no publication bias (see funnel plots).
Funnel plot for zero-coded meta-analysis
Funnel plot for max-coded meta-analysis
Appendix 3
4.1 Forest Plot for Individual Effect Sizes
The effects of social cues on social presence (zero-coded)
The effects of social cues on social presence (max-coded)
The effects of social cues on trust (zero-coded)
The effects of social cues on trust (max-coded)
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Xu, K., Chen, M. & You, L. The Hitchhiker’s Guide to a Credible and Socially Present Robot: Two Meta-Analyses of the Power of Social Cues in Human–Robot Interaction. Int J of Soc Robotics 15, 269–295 (2023). https://doi.org/10.1007/s12369-022-00961-3
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DOI: https://doi.org/10.1007/s12369-022-00961-3