Functional significance of olfactory-induced oscillations in the human amygdala

Détails

ID Serval
serval:BIB_FCD50D316B3D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Functional significance of olfactory-induced oscillations in the human amygdala
Périodique
Cereb Cortex
Auteur⸱e⸱s
Jung J., Hudry J., Ryvlin P., Royet J. P., Bertrand O., Lachaux J. P.
ISSN
1047-3211 (Print)
ISSN-L
1047-3211
Statut éditorial
Publié
Date de publication
01/2006
Volume
16
Numéro
1
Pages
1-8
Langue
anglais
Notes
Jung, Julien
Hudry, Julie
Ryvlin, Philippe
Royet, Jean-Pierre
Bertrand, Olivier
Lachaux, Jean-Philippe
eng
Research Support, Non-U.S. Gov't
Cereb Cortex. 2006 Jan;16(1):1-8. doi: 10.1093/cercor/bhi090. Epub 2005 Apr 13.
Résumé
We recorded directly from the amygdalar nucleus of nine epileptic patients performing a delayed odor-matching recognition memory task. Time-frequency analysis of the responses to the odorants revealed that the stimulations elicited induced oscillatory responses, as well as already described olfactory evoked potentials. These oscillatory responses were composed of two frequency components--one in the beta band (15-25 Hz) and a faster one, in the low gamma band (25-35 Hz)--both of which lasted during the full duration of the inspiration. In pairs of identical odorants, the power of gamma oscillations was weaker for the second odorant (the target) than for the first one (the sample). We observed no such difference when the first and second odorants of a pair were different. Thus, gamma oscillations in the amygdala are weaker for repeated stimuli, a mechanism known as repetition suppression. This is consistent with an involvement of the human amygdala in the encoding and retrieval of olfactory information independently of its hedonic properties, at least in epileptic patients. Altogether, our results corroborate in humans evidence found in animals that oscillations serve as a common coding process of olfactory information.
Mots-clé
Adaptation, Physiological, Amygdala/*physiopathology, Biological Clocks, *Discrimination Learning, Electroencephalography/*methods, Epilepsy/*physiopathology, *Evoked Potentials, Somatosensory, Female, Humans, Male, *Odorants, Sensory Thresholds, *Smell
Pubmed
Open Access
Oui
Création de la notice
29/11/2018 12:36
Dernière modification de la notice
20/08/2019 16:27
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