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Effects of Prolonged Exposure to Audiovisual Stimuli with Fixed Stimulus Onset Asynchrony on Interaction Dynamics between Primary Auditory and Primary Visual Cortex.

Editors

In: Murray MM, Wallace MT, editors.

Source

The Neural Bases of Multisensory Processes. Boca Raton (FL): CRC Press; 2012. Chapter 16.
Frontiers in Neuroscience.

Excerpt

Temporal congruity between auditory and visual stimuli has frequently been shown to be an important factor in audiovisual integration, but information about temporal congruity is blurred by the different speeds of transmission in the two sensory modalities. Compensating for the differences in transmission times is challenging for the brain because at each step of transmission, from the production of the signal to its arrival at higher cortical areas, the speed of transmission can be affected in various ways. One way to deal with this complexity could be that the compensation mechanisms remain plastic throughout its lifetime so that they can flexibly adapt to the typical transmission delays of new types of stimuli. Temporal recalibration to new values of stimulus asynchronies has been demonstrated in several behavioral studies. This study seeks to explore the potential mechanisms underlying such recalibration at the cortical level. Toward this aim, tone and light stimuli were presented repeatedly to awake, passively listening, Mongolian gerbils at the same constant lag. During stimulation, the local field potential was recorded from electrodes implanted into the auditory and visual cortices. The interaction dynamics between the auditory and visual cortices were examined using the directed transfer function (DTF; Kaminski and Blinowska 1991). With an increasing number of stimulus repetitions, the amplitude of the DTF showed characteristic changes at specific time points between and after the stimuli. Our findings support the view that repeated presentation of audiovisual stimuli at a constant delay alters the interactions between the auditory and visual cortices.

Copyright © 2012 by Taylor & Francis Group, LLC.

PMID:
22593870
[PubMed]
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