Perception of complex sounds: N1 latency codes pitch and topography codes spectra.

Détails

ID Serval
serval:BIB_23B4851016D4
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Perception of complex sounds: N1 latency codes pitch and topography codes spectra.
Périodique
Clinical neurophysiology
Auteur(s)
Crottaz-Herbette S., Ragot R.
ISSN
1388-2457 (Print)
ISSN-L
1388-2457
Statut éditorial
Publié
Date de publication
10/2000
Peer-reviewed
Oui
Volume
111
Numéro
10
Pages
1759-1766
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
This work aimed to find out whether the human cortical 'tonotopy' represents the true fundamental frequency (Fo) of complex sounds, or the center frequency CF at which harmonics peak in the audio spectrum. Indeed, complex periodic sounds (such as those of the human voice, musical instruments, etc.) comprise a 'fundamental component' (Fo) and its 'harmonics' (2Fo, 3Fo, ...nFo). These often peak around a certain frequency CF. As Fo and CF are confounded in pure (sinusoidal) tones, the question of whether Fo or CF is represented through tonotopy had been hitherto unresolved.
Whole-head recordings of brain electrical activity were obtained for 16 subjects submitted to an array of 9 different series of sounds (3 Fox3 CF). Electrophysiological data were analyzed separately for each sound and each subject with brain functional imaging and dipole reconstruction.
Equivalent dipole sources of N1 components were, significantly for all subjects, more and more frontally oriented as CF increased, independently of Fo.
Sounds are mapped in both the right and the left primary auditory cortices according to the spectral profiles of their harmonics (CF), rather than their fundamental frequencies (Fo).
Mots-clé
Adult, Analysis of Variance, Auditory Perception/physiology, Brain/physiology, Brain Mapping, Electroencephalography, Female, Humans, Male, Models, Neurological, Pitch Perception/physiology, Reaction Time/physiology
Pubmed
Web of science
Création de la notice
15/02/2019 15:34
Dernière modification de la notice
20/08/2019 14:01
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