This study assessed a new type of microswitch designed to enable a woman with acquired brain injury and profound multiple disabilities to access environmental stimulation through lip movements. The microswitch involved two optic sensors aimed at detecting changes in lip positions. Data showed that the microswitch was suitable and functional for the participant who increased her responding (lip movements) during the intervention phases of the study, that is, when her responses allowed her to access preferred stimulation. Practical implications of the findings were discussed.
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