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This study investigates whether synthetic voice pitch can regulate stress in children during robot interactions, finding no significant difference between lower and higher pitches compared to human communication norms. The results highlight a critical gap in current robotic prosody design, suggesting that fixed or unnatural vocal cues fail to replicate the emotional resonance required for effective child-robot engagement. Future advancements must focus on dynamic, multi-dimensional prosodic control rather than simple pitch adjustments to support therapeutic applications in AI-driven companionship.
Calming Robot Pitches? Exploring the Influence of Robot Voice Pitch on Children's Stress Levels
arXiv:2608.19826v1 Announce Type: cross Abstract: This study examined whether variations in robot speech pitch influence children's stress levels during a robot-guided game. Although lower-pitched voices have been shown to facilitate stress regulation in human communication, it remains unclear whether this effect generalizes to synthetic voices in child-robot interactions. Twenty-seven Dutch children aged 8-12 years were randomly assigned to interact with a Zenbo Junior II robot using either a lower-pitched or a higher-pitched voice. The interaction consisted of an introduction followed by a timed LEGO-building game. Stress levels, measured with an adapted version of CAM-S, increased during the game, confirming the stress-inducing nature of the task. No differences emerged between pitch conditions. These findings suggest that the benefits of lower pitch in reducing stress may not directly translate to child-robot interactions. Possible explanations include children's developing sensitivity to emotional tone, mismatches between the robot's voice and appearance, or the use of fixed pitch changes that sound unnatural, since real speech varies dynamically across multiple dimensions. Future research examining combinations of prosodic cues (beyond pitch alone) could provide further insights and help inform robot voice design for effective stress regulation support for children.
Title:Calming Robot Pitches? Exploring the Influence of Robot Voice Pitch on Children's Stress Levels
Abstract:This study examined whether variations in robot speech pitch influence children's stress levels during a robot-guided game. Although lower-pitched voices have been shown to facilitate stress regulation in human communication, it remains unclear whether this effect generalizes to synthetic voices in child-robot interactions. Twenty-seven Dutch children aged 8-12 years were randomly assigned to interact with a Zenbo Junior II robot using either a lower-pitched or a higher-pitched voice. The interaction consisted of an introduction followed by a timed LEGO-building game. Stress levels, measured with an adapted version of CAM-S, increased during the game, confirming the stress-inducing nature of the task. No differences emerged between pitch conditions. These findings suggest that the benefits of lower pitch in reducing stress may not directly translate to child-robot interactions. Possible explanations include children's developing sensitivity to emotional tone, mismatches between the robot's voice and appearance, or the use of fixed pitch changes that sound unnatural, since real speech varies dynamically across multiple dimensions. Future research examining combinations of prosodic cues (beyond pitch alone) could provide further insights and help inform robot voice design for effective stress regulation support for children.
Human-Computer Interaction (cs.HC); Robotics (cs.RO)
arXiv:2608.19826 [cs.HC]
(or arXiv:2608.19826v1 [cs.HC] for this version)
https://doi.org/10.48550/arXiv.2608.19826 Focus to learn more arXiv-issued DOI via DataCite
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