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Private speech during multimodal human-computer interaction

1. EXTENDED ABSTRACT Whether taking a test, looking for their keys, or addressing a computer system, people sometimes talk to themselves. Just as it might confuse a person when his officemate mutters to herself, this same self-directed speech, often termed private speech, can confuse the microphone engagement component of a spoken dialogue system. Even more recent audio-visual systems, which use lip movement and head position in addition to speech to determine when a user is addressing the system [3], would mistakenly engage when the user engages in private speech while looking at the system. To accommodate audiences who have a high rate of self-talk such as children, seniors, or people completing difficult tasks [1, 2, 4], additional information will be required.