Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloFunctional neural networks underlying semantic encoding of associative memories
Anno di pubblicazione2010
Formato
  • Elettronico
  • Cartaceo
Autore/iM. Crespo-Garcia (a); J.L. Cantero (a); A. Pomyalov (b); S. Boccaletti (c); M. Atienza (a)
Affiliazioni autori(a) Laboratory of Functional Neuroscience, Network for Biomedical Research on Neurodegenerative Diseases (CIBERNED), University Pablo de Olavide, Seville, Spain (b) Department of Chemical Physics, The Weizmann Institute of Science, Rehovot, Israel (c) NRC, Institute for Complex Systems, Florence, Italy
Autori CNR e affiliazioni
  • STEFANO BOCCALETTI
Lingua/e
  • inglese
AbstractEvidence suggests that theta oscillations recruit distributed cortical representations to improve associative encoding under semantically congruent conditions. Here we show that positive effects of semantic context on encoding and retrieval of associations are mediated by changes in the coupling pattern between EEG theta sources. During successful encoding of semantically congruent face-location associations, the right superior parietal lobe showed enhanced theta phase synchronization with other regions within the lateral posterior parietal lobe (PPL) and left medial temporal lobe (MTL). However, functional coordination involving the inferior parietal lobe was higher in the incongruent condition. These results suggest a differential engagement of top-down and bottom-up mechanisms during encoding of semantically congruent and incongruent episodic associations, respectively. Although retrieval processes operated on a similar neural network, the main difference with the study phase was the larger amount of functional links shown by the lateral prefrontal cortex with regions of the MTL and PPL. All together, these results suggest that theta oscillations mediate, at least partially, the positive effect of semantic congruence on associative memory by (i) optimizing top-down attentional mechanisms through enhanced theta phase synchronization between dorsal regions of the PPL and MTL and (ii) by adjusting the control of automatic attention to sensory and contextual information reactivated in the MTL through functional connections with the inferior parietal lobe during both encoding and retrieval processes.
Lingua abstractinglese
Altro abstract-
Lingua altro abstract-
Pagine da1258
Pagine a1270
Pagine totali-
RivistaNeuroImage (Orlando Fla., Print)
Attiva dal 1992
Editore: Academic Press, - Orlando, FL
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1053-8119
Titolo chiave: NeuroImage (Orlando Fla., Print)
Titolo proprio: NeuroImage. (Orlando Fla., Print)
Titolo abbreviato: NeuroImage (Orlando Fla., Print)
Titolo alternativo: Neuro image (Orlando Fla., Print)
Numero volume della rivista50
Fascicolo della rivista3
DOI10.1016/j.neuroimage.2010.01.018
Verificato da refereeSì: Internazionale
Stato della pubblicazione-
Indicizzazione (in banche dati controllate)
  • ISI Web of Science (WOS) (Codice:000275408200040)
Parole chiaveNeural networks, Associative memory
Link (URL, URI)http://www.sciencedirect.com/science/article/pii/S1053811910000236
Titolo parallelo-
Licenza-
Scadenza embargo-
Data di accettazione-
Note/Altre informazioni-
Strutture CNR
  • ISC — ISC - Sede secondaria di Firenze - Sesto Fiorentino
Moduli/Attività/Sottoprogetti CNR
  • MD.P02.017.001 : comportamento dinamico di sistemi complessi
Progetti Europei-
Allegati

Dati storici
I dati storici non sono modificabili, sono stati ereditati da altri sistemi (es. Gestione Istituti, PUMA, ...) e hanno solo valore storico.
Area disciplinarePhysics
Area valutazione CIVRScienze fisiche
Rivista ISINEUROIMAGE [10486J0]
NoteElsevier.