Impact of speech-generating devices on the language development of a child with childhood apraxia of speech: a case study.

PURPOSE

The purpose of the study was to evaluate the effectiveness of speech-generating devices (SGDs) on the communication and language development of a 2-year-old boy with severe childhood apraxia of speech (CAS).

METHODS

An A-B design was used over a treatment period of 1 year, followed by three additional follow-up measurements, in order to evaluate the implementation of SGDs in the speech therapy of a 2;7-year-old boy with severe CAS. In total, 53 therapy sessions were videotaped and analyzed to better understand his communicative (operationalized as means of communication) and linguistic (operationalized as intelligibility and consistency of speech-productions, lexical and grammatical development) development. The trend-lines of baseline phase A and intervention phase B were compared and percentage of non-overlapping data points were calculated to verify the value of the intervention.

RESULTS

The use of SGDs led to an immediate increase in the communicative development of the child. An increase in all linguistic variables was observed, with a latency effect of eight to nine treatment sessions.

CONCLUSIONS

The implementation of SGDs in speech therapy has the potential to be highly effective in regards to both communicative and linguistic competencies in young children with severe CAS. Implications for Rehabilitation Childhood apraxia of speech (CAS) is a neurological speech sound disorder which results in significant deficits in speech production and lead to a higher risk for language, reading and spelling difficulties. Speech-generating devices (SGD), as one method of augmentative and alternative communication (AAC), can effectively enhance the communicative and linguistic development of children with severe CAS.