Detecting Silent Vocalizations in a Locked-In Subject
(a) Paradigm for sampling from anterior and posterior temporalis muscle EMG with three conditions, rest, say “two”, and jaw clench. (b) Photos of electrode in position over the speech area underlying the posterior part and anterior part of the temporalis muscle, with the reference electrode over the mastoid bone behind the ear. (c) An example of a lower beta band peak detected in the EEG/EMG signal is shown. Note the threshold of 0.2% PSD that is crossed only by the signal over the posterior temporalis muscle that overlies the speech cortex.