Consider the stages of speech production that could be facilitated in monologues and in dialogues.
Late-night talk shows typically feature interviews with celebrities, as well as comic skits and monologues by the hosts, after whom the shows are usually named.
This explains why coming to a mutual understanding in dialogue is generally much easier than interpreting or producing utterances in monologue.
Differences in processing may simply be a matter of degree, not of kind, especially given that monologue-like episodes are common even in naturalistic conversation.
They are mistaken in assuming that we propose a categorical distinction between monologue and dialogue.
Whereas it is possible that there are differences between monologue and dialogue with respect to judgments of grammaticality, we accept that such differences are unlikely.
All our recorded examples come from spoken material and are either from dialogues or monologues with a clear audience in mind.
Indeed, they have commonly assumed that dialogue simply involves chunks of monologue stuck together.