Preperceptual and stimulus-selective enhancement of low-level human visual cortex excitability by sounds.

Détails

ID Serval
serval:BIB_732F5211D7D2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Preperceptual and stimulus-selective enhancement of low-level human visual cortex excitability by sounds.
Périodique
Current Biology
Auteur(s)
Romei Vincenzo, Murray Micah M., Cappe Celine, Thut Gregor
ISSN
1879-0445[electronic]
Statut éditorial
Publié
Date de publication
2009
Volume
19
Numéro
21
Pages
1799-1805
Langue
anglais
Résumé
Evidence of multisensory interactions within low-level cortices and at early post-stimulus latencies has prompted a paradigm shift in conceptualizations of sensory organization. However, the mechanisms of these interactions and their link to behavior remain largely unknown. One behaviorally salient stimulus is a rapidly approaching (looming) object, which can indicate potential threats. Based on findings from humans and nonhuman primates suggesting there to be selective multisensory (auditory-visual) integration of looming signals, we tested whether looming sounds would selectively modulate the excitability of visual cortex. We combined transcranial magnetic stimulation (TMS) over the occipital pole and psychophysics for "neurometric" and psychometric assays of changes in low-level visual cortex excitability (i.e., phosphene induction) and perception, respectively. Across three experiments we show that structured looming sounds considerably enhance visual cortex excitability relative to other sound categories and white-noise controls. The time course of this effect showed that modulation of visual cortex excitability started to differ between looming and stationary sounds for sound portions of very short duration (80 ms) that were significantly below (by 35 ms) perceptual discrimination threshold. Visual perceptions are thus rapidly and efficiently boosted by sounds through early, preperceptual and stimulus-selective modulation of neuronal excitability within low-level visual cortex.
Mots-clé
Monkey Auditory-Cortex, Multisensory Integration, Rhesus-Monkeys, Looming Signals, Stimulation, Connections, Modulation, Responses, Convergence, Perception
Pubmed
Web of science
Open Access
Oui
Création de la notice
09/12/2009 11:42
Dernière modification de la notice
08/05/2019 20:24
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