de.mpg.escidoc.pubman.appbase.FacesBean
Deutsch
 
Hilfe Wegweiser Impressum Kontakt Einloggen
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Poster

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

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons84049

Passamonti C, Leo,  F
Research Group Cognitive Neuroimaging, Max Planck Institute for Biological Cybernetics, Max Planck Society;

Externe Ressourcen
Es sind keine Externen Ressourcen verfügbar
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-BFC4-3
Zusammenfassung
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.