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Move it there, or not?: the design of voice commands for gaze with speech

This paper presents an experiment that was conducted to investigate gaze combined with voice commands. There has been very little research about the design of voice commands for this kind of input. It is not known yet if users prefer longer sentences like in natural dialogues or short commands. In the experiment three different voice commands are compared during a simple task in which participants had to drag & drop, rotate, and resize objects. It turned out that the shortness of a voice command -- in terms of number of words -- is more important than it being absolutely natural. Participants preferred the voice command with the fewest words and the fewest syllables. For the voice commands which had the same number of syllables, the users also preferred the one with the fewest words, even though there were no big differences in time and errors.