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This article analyses non-lexical vocalisations produced by low-verbal autistic children. Seven dyads of naturalistic interactions between non-autistic adults and low-verbal autistic children over five years old were analysed from a multimodal conversation analysis perspective. Data were extracted from an audio-visual corpus of interactions in institutional (school) and non-institutional settings (home). The data are in Brazilian Portuguese. The videos are visualised using the ELAN tool and transcribed. The analyses showed that in some cases participants did not reach a mutual understanding of the semantic meaning of non-lexical vocalisations, while in other cases, the meanings of vocalisations emerged between the participants in the multimodal process of sense-making in their embodied context. A microanalysis of where these vocalisations occurred and their multimodal aspects (linguistics, bodily, material, and spatial) suggests that: a) such occurrences are both  initiated  by the autistic child and  responsive  to the non-autistic interlocutor’s turn; b) some vocalisations play an important role in the sequential organisation of the interaction, promoting the maintenance of intersubjective of low verbal children; and c) non-autistic adult interlocutors perform a varied set of actions, recycling, incorporating, retaking, assigning meaning, and repairing the non-lexical vocalisations produced by autistic children. The indexical analysis shows how communicative ecologies create meaning. This study thus contributes to our understanding of the interactional behaviour of these children and their interlocutors.

Multimodal interaction analysis of non-lexical vocalisations in low-verbal autistic children