Auditory-Visual Speech Processing
Seen speech is dynamically produced and is usually perceived as a natural movement sequence. However, it can (also) be processed as sequences of prototype images of mouth positions (eg closed lips for bilabials, specific mouth shapes for point vowels - that is as stilled images. Using a novel paradigm controlling carefully for movement artifacts between still frames, we present fMRI evidence for partially dissociable cortical networks for reading speech from stilled and moving faces.
Bibliographic reference. Calvert, G.A. / Brammer, M.J. / Campbell, Ruth (2001): "Cortical substrates of seeing speech: still and moving faces", In AVSP-2001, 199 (abstract).