Polite But Boring? Trade-offs Between Engagement and Psychological Reactance to Chatbot Feedback Styles
Samuel Rhys Cox, Joel Wester, Niels van Berkel

TL;DR
This study examines how different chatbot feedback styles influence user engagement and reactance, revealing trade-offs and potential for novel approaches like 'Verbal Leakage' to improve interactions.
Contribution
It identifies the effects of three feedback styles on user perceptions and introduces 'Verbal Leakage' as a promising new design approach.
Findings
'Politeness' increases behavioral intentions and reduces reactance.
'Verbal Leakage' boosts surprise, engagement, and humor despite reactance.
'Direct' feedback lowers behavioral intentions and increases reactance.
Abstract
As conversational agents become increasingly common in behaviour change interventions, understanding optimal feedback delivery mechanisms becomes increasingly important. However, choosing a style that both lessens psychological reactance (perceived threats to freedom) while simultaneously eliciting feelings of surprise and engagement represents a complex design problem. We explored how three different feedback styles: 'Direct', 'Politeness', and 'Verbal Leakage' (slips or disfluencies to reveal a desired behaviour) affect user perceptions and behavioural intentions. Matching expectations from literature, the 'Direct' chatbot led to lower behavioural intentions and higher reactance, while the 'Politeness' chatbot evoked higher behavioural intentions and lower reactance. However, 'Politeness' was also seen as unsurprising and unengaging by participants. In contrast, 'Verbal Leakage'…
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