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  Cross-modal and within-modal integration in patients with collicular lesions

Bertini, C., Passamonti, C., Leo, F., & Làdavas, E. (2010). Cross-modal and within-modal integration in patients with collicular lesions. Poster presented at 11th International Multisensory Research Forum (IMRF 2010), Liverpool, UK.

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Bertini, C, Author
Passamonti , C, Author
Leo, F1, 2, Author              
Làdavas, E, Author
Affiliations:
1Research Group Cognitive Neuroimaging, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497804              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Multisensory integration is thought to be mediated by the activity of superior colliculus (SC) and to be different from unisensory integration (i.e. the integration of two stimuli of the same modality). To verify these hypotheses, six healthy subjects, six patients with subcortical lesions not involving SC and six patients with collicular lesions were tested in a redundant signals paradigm. Subjects were presented with modality-specific stimuli (visual or auditory), cross-modal (audio-visual) and within-modal (visual-visual) stimulus pairs. In all the three groups, a significant reduction in reaction times (redundant target effect: RTE) was found with audio-visual stimuli, compared to modality-specific stimuli. No significant difference was evident with within-modal pairs. The RTE for audio-visual stimuli observed in healthy subjects and patients with subcortical lesions not involving SC, violating the race model inequality, was explained by a neural coactivation mechanism. In contrast, in patients with collicular lesions, no violation of the race model was found and the RTE was explained by a statistical facilitation mechanism. Overall, these results suggested that multisensory integration is more effective in speeding responses compared to unisensory integration and is strictly dependent on the activity of SC, since patients with collicular lesions failed to demonstrate multisensory integrative abilities.

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 Dates: 2010-06
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: BertiniPLL2010
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Title: 11th International Multisensory Research Forum (IMRF 2010)
Place of Event: Liverpool, UK
Start-/End Date: 2010-06-16 - 2010-06-19

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Title: 11th International Multisensory Research Forum (IMRF 2010)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 144 Start / End Page: - Identifier: -