Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Brain electrical activity evoked by mental formation of auditory expectations and images
Autore:
Janata, P;
Indirizzi:
Univ Oregon, Inst Neurosci, Eugene, OR 97403 USA Univ Oregon Eugene OR USA 97403 egon, Inst Neurosci, Eugene, OR 97403 USA
Titolo Testata:
BRAIN TOPOGRAPHY
fascicolo: 3, volume: 13, anno: 2001,
pagine: 169 - 193
SICI:
0896-0267(200121)13:3<169:BEAEBM>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
COGNITIVE NEUROSCIENCE; PERCEPTUAL RESTORATION; PHONEMIC RESTORATION; P300 POTENTIALS; VISUAL-CORTEX; TOPOGRAPHY; ATTENTION; STIMULI; INFORMATION; EXPECTANCY;
Keywords:
emitted potential; imagery; ERP; N100; high-density EEG; superior temporal gyrus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Janata, P Dartmouth Coll, Dept Psychol & Brain Sci, 6207 Moore Hall, Hanover, NH 03755 USA Dartmouth Coll 6207 Moore Hall Hanover NH USA 03755 NH 03755 USA
Citazione:
P. Janata, "Brain electrical activity evoked by mental formation of auditory expectations and images", BRAIN TOPOG, 13(3), 2001, pp. 169-193

Abstract

Evidence for the brain's derivation of explicit expectancies in an ongoingsensory context has been well established by studies of the P300 and processing negativity (PN) components of the event-related potential (ERP). "Emitted potentials" generated in the absence of sensory input by unexpected stimulus omissions also exhibit a P300 component and provide another perspective on patterns of brain activity related to the processing of expectancies. The studies described herein extend earlier emitted potential findings inseveral aspects. First, high-density (128-channel) EEG recordings are usedfor topographical mapping of emitted potentials. Second, the primary focusis on emitted potential components preceding the P300, i.e. those components that are more Likely to resemble ERP components associated with sensory processing. Third, the dependence of emitted potentials on attention is assessed. Fourth, subjects' knowledge of the structure of an auditory stimulussequence is modulated so that emitted potentials can be compared between conditions that are identical in physical aspects but differ in terms of subjects' expectations regarding the sequence structure. Finally, a novel taskis used to elicit emitted potentials, in which subjects explicitly imaginethe continuations of simple melodies. In this task, subjects mentally complete melodic fragments in the appropriate tempo, even though they know withabsolute certainty that no sensory stimulus will occur. Emitted potentialswere elicited only when subjects actively formed expectations or images. The topographies of the initial portion of the emitted potentials were significantly correlated with the N100 topography elicited by corresponding acoustic stimuli, but uncorrelated with the topographies of corresponding silence control periods.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 07:30:32