Effects of Wording and Gendered Voices on Acceptability of Voice Assistants in Future Autonomous Vehicles

Jestin, Iris; Fischer, Joel; Galvez Trigo, Maria Jose; Large, David R; Burnett, Gary

Abstract

Voice assistants in future autonomous vehicles may play a major role in supporting the driver during periods of a transfer of control with the vehicle (handover and handback). However, little is known about the effects of different qualities of the voice assistant on its perceived acceptability, and thus its potential to support the driver's trust in the vehicle. A desktop study was carried out with 18 participants, investigating the effects of three gendered voices and different wording of prompts during handover and handback driving scenarios on measures of acceptability. Participants rated prompts by the voice assistant in nine different driving scenarios, using 5-point Likert style items in a during and post-study questionnaire as well as a short interview at the end. A commanding/formally worded prompt was rated higher on most of the desirable measures of acceptability as compared to an informally worded prompt. The 'Matthew' voice used was perceived to be less artificial and more desirable than the 'Joanna' voice and the gender-Ambiguous 'Jordan' voice; however, we caution against interpreting these results as indicative of a general preference of gender, and instead discuss our results to throw light on the complex socio-phonetic nature of voices (including gender) and wording of voice assistants, and the need for careful consideration while designing the same. Results gained facilitate the drawing of insights needed to take better care when designing the voice and wording for voice assistants in future autonomous vehicles.

• Conference Name: CUI 2022: 4th Conference on Conversational User Interfaces
• Conference Location: Glasgow, UK
• Start Date: Jul 26, 2022
• End Date: Jul 28, 2022
• Acceptance Date: Apr 8, 2022
• Online Publication Date: Jul 25, 2022
• Publication Date: Sep 15, 2022
• Deposit Date: Jun 13, 2022
• Publicly Available Date: Jul 25, 2022
• Publisher: ACM
• Pages: 1-11
• Book Title: CUI '22: Proceedings of the 4th Conference on Conversational User Interfaces
• DOI: https://doi.org/10.1145/3543829.3543836
• Keywords: autonomous vehicles; voice assistant; acceptability; gendered voice; wording; handover; handback
• Public URL: https://nottingham-repository.worktribe.com/output/8493583
• Additional Information: This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in CUI '22: Conversational User Interfaces, July 26-28 2022, Glasgow, UK, https://doi.org/10.1145/3543829.3543836.