Pennsylvania State University, University Park, Pennsylvania, United States of America
ASHA Financial Disclosures:
This research was supported by grant #90REGE0014 from the National Institute on Disability, Independent Living, and Rehabilitation Research (NIDILRR) to the Rehabilitation Engineering Research Center on Augmentative and Alternative Communication (The RERC on AAC).
ASHA Non-Financial Disclosures:
None