Electrophysiological correlates of multisensory integration of ecologically valid audiovisual events
Poster Presentation
Jeroen Stekelenburg
Psychonomics Laboratory, Tilburg University
Jean Vroomen
Psychonomics Laboratory, Tilburg University Abstract ID Number: 62 Full text:
Not available Last modified:
March 16, 2006
Presentation date: 06/19/2006 4:00 PM in Hamilton Building, Foyer
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Abstract
We investigated whether the neural mechanisms underlying the integration of auditory speech sounds and visual articulatory gestures are different from those underlying audiovisual integration of ecologically valid non-speech objects. Event related potentials (ERPs) of the syllables /bi/ and /fu/ were compared with ERPs evoked by the clapping of hands and the tapping of a spoon. Experiment 1 demonstrated that both speech and non-speech stimuli showed similar speeding up and amplitude depression of auditory N1 if the sounds were combined with visually congruent information. Experiment 2 explored which information of the visual stimulus – its content, its potential to predict when the sound is to occur, or both - was crucial for these effects. For speech and non-speech stimuli alike, visually congruent and incongruent information evoked a speeding up and amplitude depression of auditory N1, thus demonstrating that timing and not content was crucial. Visual speeding up and amplitude depression of auditory N1 is thus not a speech-specific phenomenon.
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