12th Annual Conference of the International Speech Communication Association

Florence, Italy
August 27-31. 2011

Effects of Shortening Speech Prompts of In-Car Voice User Interfaces on Users Mental Models

Julia Niemann, Kati Schulz, Ina Wechsung

Deutsche Telekom Laboratories, Germany

Shortening speech prompts reduce attention allocation display; but might on the other hand deteriorate the users' mental model. Thus the paper investigates effects of reducing time effort of speech via a transfer task, retrieval tasks and navigation-orientation tasks for three different strategies: (1) using earcons for menu orientation, (2) using commando based speech for interaction options, and (3) using uptempo speech for content based information. Results show that earcons are well qualified to not impair navigationorientation performance. Commando based speech leads to even better retrieval performance than sentence based representation of interaction. Solely uptempo speech decreased retrieval performance.

Full Paper

Bibliographic reference.  Niemann, Julia / Schulz, Kati / Wechsung, Ina (2011): "Effects of shortening speech prompts of in-car voice user interfaces on users mental models", In INTERSPEECH-2011, 1521-1524.