AUTHOR=Hirvenkari Lotta , Jousmäki Veikko , Lamminmäki Satu , Saarinen Veli-Matti , SAMS Mikko E., Hari Riitta 

TITLE=Gaze-direction-based MEG averaging during audiovisual speech perception

JOURNAL=Frontiers in Human Neuroscience

VOLUME=4

YEAR=2010

URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2010.00017

DOI=10.3389/fnhum.2010.00017

ISSN=1662-5161

ABSTRACT=<p>To take a step towards real-life-like experimental setups, we simultaneously recorded magnetoencephalographic (MEG) signals and subject's gaze direction during audiovisual speech perception. The stimuli were utterances of /apa/ dubbed onto two side-by-side female faces articulating /apa/ (congruent) and /aka/ (incongruent) in synchrony, repeated once every 3 s. Subjects (<italic>N</italic> = 10) were free to decide which face they viewed, and responses were averaged to two categories according to the gaze direction. The right-hemisphere 100-ms response to the onset of the second vowel (N100m’) was a fifth smaller to incongruent than congruent stimuli. The results demonstrate the feasibility of realistic viewing conditions with gaze-based averaging of MEG signals.</p>