In this article I review conversation analytic work on 'atypical interaction', that is social interactions where a participant has a communicative impairment. Drawing together some of the main themes and findings in the field, I highlight three forms of atypicality in these interactions, with each linked to more than one type of communicative impairment: (1) atypical forms of delay in TCU progressivity; (2) atypical problems of understandability, intelligibility and hearing; and (3) atypical actions. I also discuss forms of atypicality that appear to arise from one or more participants adapting their talk or conduct to deal with the impact of the impairment within interaction. The article concludes with some considerations of directions that future work in this field might take.Before discussing where the study of atypical interaction currently stands, it may be useful to provide some background, both to the nature and range of communicative disorders, and to how CA has been applied in this area over the last few decades.
Communication disordersHistorically, communication disorders have been the focus of attention from a number of academic and clinical disciplines, including medicine, psychology, psychiatry, linguistics, and speech pathology/therapy. As a result, there are a number of competing approaches to the classification of communication disorders (and sub-types of particular disorders).One broad division of types of disorders that impact on communication is between those that are 'congenital/developmental' (occurring before birth or during development in childhood) and those that are 'acquired' (occurring after the person has developed communication, most commonly in adulthood). Another distinction is between those that are 'organic' (that have an anatomical, physiological or neurological basis) and 'functional' (that have no such known basis). A third type of classification, which is the one which will be primarily used in this paper, is to divide up communication disorders in terms of different areas of competency that are involved in the production of coherent and intelligible talk and other social conduct. These areas of competency can be selectively, or at least to some extent selectively impaired 1 . One system of grouping disorders along these lines is set out below (for further details of these disorders, and for other ways of grouping them, see e.g. Kent, 2004).
Disorders in which speech is impairedThis includes motor speech disorders such as dysarthria, which can be present in people with developmental disorders (for example, cerebral palsy), or acquired disorders (for example, Parkinson's disease or motor neurone disease). Dysarthria can impair the speaker's ability to physically produce intelligible speech due to impairments to motor speech subsystems (articulation, respiration, phonation, resonance). Some people with dysarthria, particularly in more severe cases, may rely on augmentative and alternative communication (AAC) to communicate more than on speech. AAC can range from writing or drawi...