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Titolo:
Intracranial identification of an electric frontal-cortex response to auditory stimulus change: a case study
Autore:
Liasis, A; Towell, A; Alho, K; Boyd, S;
Indirizzi:
Great Ormond St Hosp Children, Dept Clin Neurophysiol, London WC1N 3JH, England Great Ormond St Hosp Children London England WC1N 3JH WC1N 3JH, England Univ Westminster, Dept Psychol, London W1R 8AL, England Univ Westminster London England W1R 8AL Psychol, London W1R 8AL, England Univ Helsinki, Dept Psychol, Cognit Brain Res Unit, SF-00100 Helsinki, Finland Univ Helsinki Helsinki Finland SF-00100 Unit, SF-00100 Helsinki, Finland
Titolo Testata:
COGNITIVE BRAIN RESEARCH
fascicolo: 2, volume: 11, anno: 2001,
pagine: 227 - 233
SICI:
0926-6410(200104)11:2<227:IIOAEF>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIPOLE-MODEL ANALYSIS; MISMATCH NEGATIVITY; SENSORY MEMORY; VISUAL-STIMULI; INTRACEREBRAL POTENTIALS; PHONEME REPRESENTATIONS; SELECTIVE-ATTENTION; SPEECH STIMULI; RARE TARGET; N1 WAVE;
Keywords:
frontal lobe; mismatch negativity; auditory ERPs; attention;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Towell, A Great Ormond St Hosp Children, Dept Clin Neurophysiol, Great Ormond St, London WC1N 3JH, England Great Ormond St Hosp Children Great OrmondSt London England WC1N 3JH
Citazione:
A. Liasis et al., "Intracranial identification of an electric frontal-cortex response to auditory stimulus change: a case study", COGN BRAIN, 11(2), 2001, pp. 227-233

Abstract

The aim of the present study was to clarify whether ERPs recorded directlyfrom the human frontal cortex contributed to the auditory N1 and mismatch negativity (MMN) elicited by changes in non-phonetic and phonetic sounds. We examined the role of prefrontal cortex in the processing of stimulus repetition and change in a 6-year-old child undergoing presurgical evaluation for epilepsy. EEG was recorded from three bilateral sub-dural electrode strips located over lateral prefrontal areas during unattended auditory stimulation. EEG epochs were averaged to obtain event-related potentials (ERPs) torepeating (standard) tones and to infrequent (deviant) shorter duration tones and complex sounds (telephone buzz). In another condition, ERPs were recorded to standard and deviant syllables, /ba/ and /da/, respectively. ERPsto vibration stimuli delivered to the fingertips were not observed at any of the sub-dural electrodes, confirming modality specificity of the auditory responses. Focal auditory ERPs consisting of P100 and N150 deflections were recorded to both tones and phonemes over the right lateral prefrontal cortex. These responses were insensitive to the serial position of the repeating sound in the stimulus train. Deviant tones evoked an MMN peaking at around 128 ms. Deviant complex sounds evoked ERPs with a similar onset latencyand morphology bur with an approximately two-fold increase in peak-to-peakamplitude. We conclude that right lateral prefrontal cortex (Brodmann's area 45) is involved in early stages of processing repeating sounds and soundchanges. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/07/20 alle ore 18:16:45