Related Experiment Video
Updated: Aug 11, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
Published on: June 29, 2021
Cortical oscillations related to processing congruent and incongruent grapheme-phoneme pairs
Anthony T Herdman1, Takako Fujioka, Wilkin Chau
1The Rotman Research Institute at Baycrest Centre, 3560 Bathurst Street, Toronto, Ont., Canada M6A 2E1. aherdman@rotman-baycrest.on.ca
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.
Related Concept Videos
Perception of Sound Waves
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Association Areas of the Cortex
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Auditory Perception
Oscillations about an Equilibrium Position
Somatosensory, Motor, and Association Cortex

