An evaluation of speech production in two boys with neurodevelopmental disorders who received communication intervention with a speech-generating device

•Two children with neurodevelopmental disorders and severe communication impairment learned to use an iPad®-based speech-generating device to request preferred stimuli.•The children also showed increased use of natural speech to request the preferred stimuli.•The results suggest that initial SGD intervention, followed by subsequent withdrawal of the SGD, might increase natural speech production in some children with neurodevelopmental disorders.•This effect could be an example of response generalization. Children with neurodevelopmental disorders often present with little or no speech. Augmentative and alternative communication (AAC) aims to promote functional communication using non-speech modes, but it might also influence natural speech production. To investigate this possibility, we provided AAC intervention to two boys with neurodevelopmental disorders and severe communication impairment. Intervention focused on teaching the boys to use a tablet computer-based speech-generating device (SGD) to request preferred stimuli. During SGD intervention, both boys began to utter relevant single words. In an effort to induce more speech, and investigate the relation between SGD availability and natural speech production, the SGD was removed during some requesting opportunities. With intervention, both participants learned to use the SGD to request preferred stimuli. After learning to use the SGD, both participants began to respond more frequently with natural speech when the SGD was removed. The results suggest that a rehabilitation program involving initial SGD intervention, followed by subsequent withdrawal of the SGD, might increase the frequency of natural speech production in some children with neurodevelopmental disorders. This effect could be an example of response generalization.