To Beat or Not to Beat: Beat Gestures in Direction Giving

摘要

Research on gesture generation for embodied conversational agents (ECA's) mostly focuses on gesture types such as pointing and iconic gestures, while ignoring another gesture type frequently used by human speakers: beat gestures. Analysis of a corpus of route descriptions showed that although annotators show very low agreement in applying a 'beat filter' aimed at identifying physical features of beat gestures, they are capable of reliably distinguishing beats from other gestures in a more intuitive manner. Beat gestures made up more than 30% of the gestures in our corpus, and they were sometimes used when expressing concepts for which other gesture types seemed a more obvious choice. Based on these findings we propose a simple, probabilistic model of beat production for ECA's. However, it is clear that more research is needed to determine why direction givers in some cases use beats when other gestures seem more appropriate, and vice versa.