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Abstract:
Neuronal oscillations are considered crucial for information processing in the brain as they can
potentially regulate information flow and dynamically bind different cortical and non-cortical
regions. This MEG study investigated whether the effect of a transient sound was modulated
by the phase of oscillations in the visual cortex. To induce steady state oscillations in the
visual cortex, we presented subjects with continuous visual signals luminance-modulated at
4Hz or 10Hz. The transient sounds were presented locked to four phases of the periodic visual
stimulus (i.e. 0, 1
2, , 3
4). We then investigated whether the effect of sound depends on
the phase of the visual steady state activity by testing for the interaction between sound
and visual phase. Conversely, we will investigate the effect of the sound processing on the
visual steady state processing given the state of the visual cortex. The results from the two
experiments (4Hz 10Hz) will be combined and compared. Based on recent neurophysiological
evidence, we hypothesize that oscillations at different frequencies play distinct functional
roles in multisensory integration.
