Corpora such as the HCRC MapTask corpus of dyadic information gap task-based conversations (Anderson et al., 1991), ICSI and AMI multiparty meeting corpora (Janin et al., 2003;McCowan et al., 2005), and resources such as recordings of televised political interviews (Beattie, 1983) have contributed greatly to our understanding of different facets of spoken interaction such as timing, turntaking, and dialogue architecture.
the speech in these resources, while spontaneous and conversational, cannot be considered casual talk, and the results obtained from their analysis may not transfer to the less studied 'unmarked' case of casual conversation.