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Experimental Brain Research

Erschienen in:

01.02.2008 | Research Article

Multisensory integration affects ERP components elicited by exogenous cues

verfasst von: Valerio Santangelo, Rob H. J. Van der Lubbe, Marta Olivetti Belardinelli, Albert Postma

Erschienen in: Experimental Brain Research | Ausgabe 2/2008

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Abstract

Previous studies have shown that the amplitude of event related brain potentials (ERPs) elicited by a combined audiovisual stimulus is larger than the sum of a single auditory and visual stimulus. This enlargement is thought to reflect multisensory integration. Based on these data, it may be hypothesized that the speeding up of responses, due to exogenous orienting effects induced by bimodal cues, exceeds the sum of single unimodal cues. Behavioral data, however, typically revealed no increased orienting effect following bimodal as compared to unimodal cues, which could be due to a failure of multisensory integration of the cues. To examine this possibility, we computed ERPs elicited by both bimodal (audiovisual) and unimodal (either auditory or visual) cues, and determined their exogenous orienting effects on responses to a to-be-discriminated visual target. Interestingly, the posterior P1 component elicited by bimodal cues was larger than the sum of the P1 components elicited by a single auditory and visual cue (i.e., a superadditive effect), but no enhanced orienting effect was found on response speed. The latter result suggests that multisensory integration elicited by our bimodal cues plays no special role for spatial orienting, at least in the present setting.

Given the fact that the signal to noise ratio (SNR) of amplitude measures depends on the number of trials used to create the averages, we examined whether conditions differed in these amounts. A two-way ANOVA with the within-participants factors of Cue type (unimodal, crossmodal, or bimodal) and Cue Side (left or right) revealed no significant effects (all Fs < 2.7; Ps > 0.128), indicating that there were no differences in the number of trials between conditions.

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Titel: Multisensory integration affects ERP components elicited by exogenous cues
verfasst von: Valerio Santangelo
Rob H. J. Van der Lubbe
Marta Olivetti Belardinelli
Albert Postma
Publikationsdatum: 01.02.2008
Verlag: Springer-Verlag
Erschienen in: Experimental Brain Research / Ausgabe 2/2008
Print ISSN: 0014-4819
Elektronische ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-007-1151-5

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