Abstract
The purpose of this study was to explore the unit of information and the size of the unit for designing a voice user interface. Through two experiments, this study investigated what form the information (the unit of information) should take and what size of that (the size of unit) should be when people were provided information by voice interfaces. Participants were presented with a task to recall (OX quiz) by listening to and remembering information (based on an encyclopedia) provided by smart speakers. In Experiment 1, it was revealed that participants stored information in their memory span on a sentence-by-sentences basis to determine how much information they could remember. In Experiment 2, sentence-based information was presented in various sizes, and participants evaluated 17 information units consisting of up to nine words as their memory limit. This information unit-based voice interface design could help improve users’ memory performance and usability.
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