Science for the Public visits Professor Frank Guenther at his Neural Prosthesis Lab at Boston University. Dr. Guenther and his colleagues at the NPL explain their famous brain model for speech production --the leading model in the field. And members of the lab demonstrate the Brain Computer Interface device that is making it possible for speech-impaired individuals, such as stroke victims, to communicate. They discussed their work on new technologies that help even completely paralyzed people to speak. The scientists explain what they do and also how they got into this dynamic field.