Conversations are cooperatively achieved speech events. In introducing a new topic, there are specific procedures followed to close the old topic. Because these procedures take place over a series of utterances, both/all participants must cooperate to close a topic. Analysis of conversations among adults who know each other suggests that there are…

Discusses the literature on interference as the cause of errors in second language speech. A study is reported which shows that interference by the native language is most often the factor responsible for the largest number of mistakes in grammar and vocabulary. (Author/AMH)

Compares language patterns in two moderately aphasic adults over age 60 with left hemisphere damage, using measures of lexical richness (word frequency). Argues for the usefulness of evaluating patients on conversational speech and the role of extensive linguistic analysis in prognosis and therapy. The discussion considers both qualitative and…