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Titolo:
PSYCHOPHYSIOLOGICAL AND MODULATORY INTERACTIONS IN NEUROIMAGING
Autore:
FRISTON KJ; BUECHEL C; FINK GR; MORRIS J; ROLLS E; DOLAN RJ;
Indirizzi:
WELLCOME DEPT COGNIT NEUROL,INST NEUROL,12 QUEEN SQ LONDON WC1N 3BG ENGLAND UNIV OXFORD,DEPT PSYCHOL OXFORD ENGLAND ROYAL FREE HOSP,SCH MED LONDON ENGLAND
Titolo Testata:
NeuroImage
fascicolo: 3, volume: 6, anno: 1997,
pagine: 218 - 229
SICI:
1053-8119(1997)6:3<218:PAMIIN>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
FMRI TIME-SERIES; FUNCTIONAL CONNECTIVITY; BRAIN; PET;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Friston et al., "PSYCHOPHYSIOLOGICAL AND MODULATORY INTERACTIONS IN NEUROIMAGING", NeuroImage, 6(3), 1997, pp. 218-229

Abstract

In this paper we introduce the idea of explaining responses, in one cortical area, in terms of an interaction between the influence of another area and some experimental (sensory or task-related) parameter. Werefer to these effects as psychophysiological interactions and relatethem to interactions based solely on experimental factors (i.e., psychological interactions), in factorial designs, and interactions among neurophysiological measurements (i.e., physiological interactions). Wehave framed psychophysiological interactions in terms of functional integration by noting that the degree to which the activity in one areacan be predicted, on the basis of activity in another, corresponds tothe contribution of the second to the first, where this contribution can be related to effective connectivity. A psychophysiological interaction means that the contribution of one area to another changes significantly with the experimental or psychological context. Alternativelythese interactions can be thought of as a contribution-dependent change in regional responses to an experimental or psychological factor. In other words the contribution can be thought of as modulating the responses elicited by a particular stimulus or psychological process. Thepotential importance of this approach lies in (i) conferring a degreeof functional specificity on this aspect of effective connectivity and (ii) providing a model of modulation, where the contribution from a distal area can be considered to modulate responses to the psychological or stimulus-specific factor defining the interaction. Although distinct in neurobiological terms, these are equivalent perspectives on the same underlying interaction. We illustrate these points using a functional magnetic resonance imaging study of attention to visual motion and a position emission tomography study of visual priming. We focus on interactions among extrastriate, inferotemporal, and posterior parietal regions during visual processing, under different attentional and perceptual conditions. (C) 1997 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 20:57:04