Competence in discourse as a measure of social integration and quality of life in persons with traumatic brain injury.

Persisting difficulties in communication are a serious handicap faced by many after traumatic brain injury (TBI) and a major barrier to community reintegration. Conventional approaches to the study of communication problems after TBI have focused on the form of language production and expression, usually in terms of phonological, semantic, and syntactical features. Most TBI patients, however, perform overall within normal ranges on these conventional indicators. More recently, attention has focused on language in its naturally-occurring form, that is, discourse, which is heavily influenced by linguistic, cognitive and social skills. Because most TBI patients are left with residual deficits in these areas, study of discourse abilities seem to be particularly suited to understanding their problems in communication and facilitating eventual reintegration into the community. This study was designed to determine if and how the conversational discourse of TBI patients differs from a matched non-TBI group and whether any identified variables are related to measures of outcome as measured by community integration and quality of life. Additionally, the study was designed to explore the relationship between TBI and features of discourse across conversational, narrative, procedural genres. TBI patients (n = 30) from an out-patient brain injury programme were compared to matched controls (n = 10) in the three discourse genres. Bivariate and multivariate analyses evaluated 23 measures of discourse efficiency, complexity, topic management, information and pragmatic behaviours in each genre as well as measures of psychosocial adjustment, particularly social integration and quality of life. Results indicated that TBIs were significantly different from controls on several measures of discourse and psychosocial adjustment. A number of other features of discourse were found to correlate significantly with social integration and quality of life. Interestingly, discourse variables appeared to correlate with social integration more strongly than age, gender, education, and other conventional psychosocial factors. Contrary to prediction, features of conversational discourse did not correlate more strongly than other types of discourse with social integration and quality of life. Discussion centred on the apparent comorbidity of features in everyday discourse and psychosocial determinants that were associated with quality of life and social integration.