Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
HIGH-PRECISION NEUROMAGNETIC STUDY OF THE FUNCTIONAL-ORGANIZATION OF THE HUMAN AUDITORY-CORTEX
Autore:
LUTKENHONER B; STEINSTRATER O;
Indirizzi:
UNIV MUNSTER,INST EXPT AUDIOL,KARDINAL VON GALEN RING 10 D-48129 MUNSTER GERMANY
Titolo Testata:
Audiology & neuro-otology
fascicolo: 2-3, volume: 3, anno: 1998,
pagine: 191 - 213
SICI:
1420-3030(1998)3:2-3<191:HNSOTF>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVOKED MAGNETIC-FIELDS; TONOTOPIC ORGANIZATION; NEURONAL-ACTIVITY; PLANUM-TEMPORALE; VISUAL AREAS; LOCALIZATION; RESPONSES; ASYMMETRY; BRAIN; RAT;
Keywords:
AUDITORY CORTEX; HESCHLS GYRUS; PLANUM TEMPORALE; AUDITORY EVOKED FIELD; TONOTOPY; N1M; P2M; BIOMAGNETISM; MAGNETOENCEPHALOGRAPHY; CURRENT DIPOLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
B. Lutkenhoner e O. Steinstrater, "HIGH-PRECISION NEUROMAGNETIC STUDY OF THE FUNCTIONAL-ORGANIZATION OF THE HUMAN AUDITORY-CORTEX", Audiology & neuro-otology, 3(2-3), 1998, pp. 191-213

Abstract

Previous studies have proven that a dipole source analysis of the auditory evoked field is capable of providing evidence of the tonotopic organization of the human auditory cortex. To explore the nature of theestimated dipoles in greater detail, a single subject was extensivelystudied, and the estimated sources were registered in a three-dimensional reconstruction of the cortical surface derived from magnetic resonance images. The stimuli were 500-ms tone bursts with frequencies of 250, 500, 1,000, and 2,000 Hz (mean intensity of 60 dB SL). The total number of stimuli presented per condition was about 3,600 (36 independent experiments spread over 4 days). Using special postprocessing techniques, the relative localization accuracy could be enhanced to such an extent that differences in the dipole locations of 1 mm could be clearly distinguished. The results suggest that peak Nlm (latency around 100 ms) arises from the planum temporale, whereas peak P2m (latency around 170 ms) appears to correspond to a center of activity in (or close to) Heschl's gyrus. The tonotopic organization found for the generator of Nlm was consistent with earlier studies ('the higher the frequency the deeper the source'). However, additional findings (time dependence of the estimated sources; slightly different tonotopy obtained forfield change; dependence of the estimated sources on the estimation technique) indicate that multiple areas are involved in the generation of Nlm. Evidence of a frequency-dependent source location was found also for P2m.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 18:30:20