title: Cortical oscillations related to processing congruent and incongruent grapheme-phoneme pairs.
abstract: In this study, we investigated changes in cortical oscillations following congruent and incongruent grapheme-phoneme stimuli. Hiragana graphemes and phonemes were simultaneously presented as congruent or incongruent audiovisual stimuli to native Japanese-speaking participants. The discriminative reaction time was 57 ms shorter for congruent than incongruent stimuli. Analysis of MEG responses using synthetic aperture magnetometry (SAM) revealed that congruent stimuli evoked larger 2-10 Hz activity in the left auditory cortex within the first 250 ms after stimulus onset, and smaller 2-16 Hz activity in bilateral visual cortices between 250 and 500 ms. These results indicate that congruent visual input can modify cortical activity in the left auditory cortex.
authors.affiliation: The Rotman Research Institute at Baycrest Centre, 3560 Bathurst Street, Toronto, Ont., Canada M6A 2E1. aherdman@rotman-baycrest.on.ca
authors.forename: Anthony T
authors.initials: AT
authors.lastname: Herdman
authors.forename: Takako
authors.initials: T
authors.lastname: Fujioka
authors.forename: Wilkin
authors.initials: W
authors.lastname: Chau
authors.forename: Bernhard
authors.initials: B
authors.lastname: Ross
authors.forename: Christo
authors.initials: C
authors.lastname: Pantev
authors.forename: Terence W
authors.initials: TW
authors.lastname: Picton
mesh_terms: D000161:Acoustic Stimulation; D001303:Auditory Cortex / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D013067:Speech Perception; D014793:Visual Cortex / Q000502:physiology*