Voice output communication aids (VOCAs) or speech generating devices (SGDs) are electronic devices which enable the user to speak.
The simplest VOCAs store a single pre-recorded message, which is produced in the form of digitised speech when the person using the device presses a button, switch, or key.
The most elaborate VOCAs include software that allows users to create and combine words to produce novel utterances in the form of computerised synthetic speech.
This glossary is designed to explain some of the jargon and gobbledygook used by some people when they talk about autism or research..
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The fact that an intervention is listed in this glossary does not necessarily mean that we agree with its use. Nor does it necessarily mean that there is any scientifically valid or reliable evidence behind it.