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Titolo:
MAGNETIC MISMATCH FIELDS ELICITED BY VOWELS AND CONSONANTS
Autore:
DIESCH E; LUCE T;
Indirizzi:
TECH UNIV BERLIN,INST PSYCHOL,DOVESTR 1-5 D-10587 BERLIN GERMANY FREE UNIV BERLIN,DEPT PHYS D-1000 BERLIN GERMANY
Titolo Testata:
Experimental Brain Research
fascicolo: 1, volume: 116, anno: 1997,
pagine: 139 - 152
SICI:
0014-4819(1997)116:1<139:MMFEBV>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN AUDITORY-CORTEX; BIOMAGNETIC INVERSE PROBLEM; EVENT-RELATED POTENTIALS; SPEECH-PERCEPTION; STIMULUS DEVIANCE; EVOKED-POTENTIALS; BRAIN POTENTIALS; NEGATIVITY MMN; FRONTAL-CORTEX; RESPONSES;
Keywords:
EVOKED MAGNETIC FIELDS; MISMATCH NEGATIVITY; AUDITORY CORTEX; SPEECH PERCEPTION; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
96
Recensione:
Indirizzi per estratti:
Citazione:
E. Diesch e T. Luce, "MAGNETIC MISMATCH FIELDS ELICITED BY VOWELS AND CONSONANTS", Experimental Brain Research, 116(1), 1997, pp. 139-152

Abstract

Auditory-evoked mismatch fields (MMFs) elicited by vowel contrasts and plosive stop consonant place-of-articulation contrasts were recordedover the left hemisphere of neurologically and audiologically normal subjects. Two experiments were conducted: vowels were presented in isolation in experiment 1 and embedded in consonant-vowel syllables in experiment 2. Best-fit equivalent MMF sources were obtained using the model of a single, spatiotemporal current dipole in a sphere. In both experiments, MMF sources activated by place-of-articulation contrasts were later in latency and smaller in dipole moment amplitude than MMF sources excited by vowel contrasts. There was evidence, albeit not unambiguous, for the vowel-contrast MMF sources being located more posteriorly than the consonant-contrast MMF sources in experiment 1 and more laterally in experiment 2. In both experiments, the MMF source excited by the contrast between /da/ and /ga/ was more anterior than the MMF source excited by the contrast between /da/ and /ba/. The effects on latency and dipole moment may be interpreted to mirror differences in perceptual discriminability and auditory memory decay between consonantal place-of-articulation contrasts and vowel contrasts. Similarly, the effects on location may be interpreted to reflect featural specificityof the mismatch response. Interestingly, the dipole source analysis results show a correspondence to the pattern of preservation and loss of the mismatch response to Vowel and consonant place-of-articulation contrasts recently observed in Wernicke's aphasia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 18:57:00