Conversations in dementia with Lewy bodies: Resources and barriers in communication

In dementia with Lewy bodies (DLB), limitations in linguistic and cognitive abilities may lead to difficulties in participating in conversations. The conversational outcome is also dependent on how the conversation partner adjusts to potential communicative challenges.

This study explored resources and barriers in communication in DLB.

Linguistic and cognitive function was explored through standard clinical testing. The dyad's perception of function in daily life was explored through semi-structured interviews analysed with content analysis. Interactional patterns and participation in casual conversation was analysed with conversation analysis.

The results show how the husband diagnosed with DLB performed with high scores across most cognitive and linguistic test tasks. The interview data, however, revealed how both he and his wife experienced significant challenges regarding, for example, conversational tempo, as well as negative feelings relating to adjusting to these conversational changes. The interactional data from the casual conversation revealed, among other patterns, how the wife engaged in most of the storytelling in the conversation. The husband contributed details when his wife asked for help, or he acknowledged a faulty or missing detail in his wife's storyline. Thus, they both oriented to the husband's competence in monitoring and keeping track of the conversational content, despite challenges in taking the floor.

A holistic picture of communication in DLB necessitates the use of different evaluation approaches. Both monological (e.g., test tasks revealing cognitive and linguistic resources) and dialogical information sources (e.g., observations of conversations revealing adjustments in conversations), as well as the perceptions of those engaging in everyday conversations (i.e., people with DLB and their conversation partner(s)), need to be evaluated when assessing resources and barriers in communication.

What is already known on the subject It is well-known that dementia with Lewy bodies (DLB) affects language and cognition. In conversations, persons with DLB experience difficulties in turn-taking, topic initiation, entering conversations and keeping up with the conversational tempo. What this study adds This study sheds light on conversations in one dyad where the husband has been diagnosed with DLB. The results from three different information sources (testing of language and cognition, interviews and a video-recorded conversation) reveal patterns of resources and barriers that at first appear to contradict each other. However, the contradictions can be resolved when these discrepancies are examined in light of the differences in task structure, in terms of, for example, predetermined topics and how turn-taking is managed. What are the potential or actual clinical implications of this work? In order to gather a holistic picture of a person's conversational abilities, clinicians need to include information from both monological tasks (e.g., linguistic testing) as well as dialogical tasks (e.g., video recordings from conversation). The results also need to be evaluated in light of all conversation partners' perspectives on function in daily life. Furthermore, it is important to consider the nature of assessment tasks (particularly their interactional structure) when interpreting assessment results.