Backchannels (BCs) are short vocal and visual listener responses that signal attention, interest, and understanding to the speaker. Previous studies have investigated BC prediction in telephone-style dialogs from prosodic cues. In contrast, we consider spontaneous face-to-face dialogs. The additional visual modality allows speaker and listener to monitor each other's attention continuously, and we hypothesize that this affects the BC-inviting cues. In this study, we investigate how gaze, in addition to prosody, can cue BCs. Moreover, we focus on the type of BC performed, with the aim to find out whether vocal and visual BCs are invited by similar cues. In contrast to telephone-style dialogs, we do not find rising/falling pitch to be a BC-inviting cue. However, in a face-to-face setting, gaze appears to cue BCs. In addition, we find that mutual gaze occurs significantly more often during visual BCs. Moreover, vocal BCs are more likely to be timed during pauses in the speaker's speech.
|Title of host publication||Proceedings of Interspeech 2011|
|Place of Publication||France|
|Publisher||International Speech Communication Association (ISCA)|
|Number of pages||4|
|Publication status||Published - Aug 2011|
|Event||12th Annual Conference of the International Speech Communication Association, INTERSPEECH 2011 - Florence, Italy|
Duration: 28 Aug 2011 → 31 Aug 2011
Conference number: 12
|Publisher||International Speech Communication Association|
|Conference||12th Annual Conference of the International Speech Communication Association, INTERSPEECH 2011|
|Period||28/08/11 → 31/08/11|
- EC Grant Agreement nr.: FP7/231287
Truong, K. P., Poppe, R. W., de Kok, I. A., & Heylen, D. K. J. (2011). A Multimodal Analysis of Vocal and Visual Backchannels in Spontaneous Dialogs. In Proceedings of Interspeech 2011 (pp. 2973-2976). France: International Speech Communication Association (ISCA).