Acknowlegement
The authors would like to acknowledge support for the Seventh International Brain-Computer Interface Meeting through grant R13DC016830 from the National Institute on Deafness and Other Communication Disorders and the National Institute of Neurological Disorders and Stroke within the National Institutes of Health; and a grant from the National Science Foundation. The opinions expressed are those of the authors and not the funding institutes.
Disclosure statement
No potential conflict of interest was reported by the authors.