Putaminal activity is related to perceptual certainty.

Détails

ID Serval
serval:BIB_074ED8D281EE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Putaminal activity is related to perceptual certainty.
Périodique
Neuroimage
Auteur(s)
Pastor M.A., Macaluso E., Day B.L., Frackowiak R.S.
ISSN
1053-8119 (Print)
ISSN-L
1053-8119
Statut éditorial
Publié
Date de publication
2008
Volume
41
Numéro
1
Pages
123-129
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
We have investigated the neural basis of perceptual certainty using a simple discrimination paradigm. Psychophysical experiments have shown that a pair of identical electrical stimuli to the skin or a pair of auditory clicks to the ears are consistently perceived as two separate events in time when the inter-stimulus interval (ISIs) is long, and perceived as simultaneous events when the ISIs are very short. The perceptual certainty of having received one or two stimuli decreases when the ISI lies between these two extremes and this is reflected in inconsistent reporting of the percept across trials. In two fMRI experiments, 14 healthy subjects received either paired electrical pulses delivered to the forearm (ISIs=5-110 ms) or paired auditory clicks presented binaurally (ISIs=1-20 ms). For each subject and modality, we calculated a consistency index (CI) representing the level of perceptual certainty. The task activated pre-SMA and anterior cingulate cortex, plus the cerebellum and the basal ganglia. Critically, activity in the right putamen was linearly dependent on CI for both tactile and auditory discrimination, with topographically distinct effects in the two modalities. These results support a role for the human putamen in the "automatic" perception of temporal features of tactile and auditory stimuli.
Mots-clé
Adult, Algorithms, Auditory Perception/physiology, Auditory Threshold/physiology, Basal Ganglia/physiology, Discrimination (Psychology)/physiology, Humans, Magnetic Resonance Imaging, Perception/physiology, Physical Stimulation, Psychomotor Performance/physiology, Putamen/physiology, Sensory Thresholds/physiology, Touch/physiology
Pubmed
Web of science
Création de la notice
11/09/2011 18:54
Dernière modification de la notice
20/08/2019 13:29
Données d'usage