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Titolo:
Replication and further studies of neural mechanisms of spatial mnemonic processing in humans
Autore:
Zarahn, E; Aguirre, G; DEsposito, M;
Indirizzi:
Univ Penn, Med Ctr, Dept Neurol, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 pt Neurol, Philadelphia, PA 19104 USA
Titolo Testata:
COGNITIVE BRAIN RESEARCH
fascicolo: 1, volume: 9, anno: 2000,
pagine: 1 - 17
SICI:
0926-6410(200001)9:1<1:RAFSON>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; FRONTAL EYE-FIELD; POSTERIOR PARIETAL CORTEX; MEMORY-GUIDED SACCADES; TRANSCRANIAL MAGNETIC STIMULATION; DORSOLATERAL PREFRONTAL CORTEX; LATERAL INTRAPARIETAL AREA; VISUAL WORKING-MEMORY; FMRI TIME-SERIES; CINGULATE CORTEX;
Keywords:
accuracy; cognitive subtraction; delay; fMRI; replication; spatial working memory;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
74
Recensione:
Indirizzi per estratti:
Indirizzo: Zarahn, E Hosp Univ Penn, Dept Neurol, 3 West Gates,3400 Spruce St, Philadelphia, PA19104 USA Hosp Univ Penn 3 West Gates,3400 Spruce St PhiladelphiaPA USA 19104
Citazione:
E. Zarahn et al., "Replication and further studies of neural mechanisms of spatial mnemonic processing in humans", COGN BRAIN, 9(1), 2000, pp. 1-17

Abstract

Changes in neuronal firing rates during periods of time when subjects are required to remember information (retention delays) have been reported in non-human primates. In humans, tests for such functional changes using hemodynamic markers of neural activity have typically relied on cognitive subtraction. However, the temporal resolution of fMRI allows a more direct test than that afforded by cognitive subtraction of the idea that certain brain regions may increase their neural activity during retention delays in humans. Using a method that exploits this temporal resolution, increased functional activity attributable to a retention delay for spatial information in regions proximate to/within the right frontal eye field and the right superior parietal lobule were detected tin four out of four and three out of four subjects, respectively; this is an internal replication of the results of [E. Zarahn, G.K. Aguirre, M. D'Esposito, Temporal isolation of the neural correlates of spatial mnemonic processing with fMRI, Cognit. Brain Res., 7 (1999) 255-268.]). Second, a model in which ventral and not dorsal prefrontalcortex in humans is involved in simply maintaining spatial information wastested. The results disputed this model as increases in fMRI signal attributable to the retention delay were detected more frequently in dorsal than ventral prefrontal cortex. Third, a model which posited that the intensity of neural activity is causally related to the accuracy of spatial mnemonic representation was tested by comparing retention delay signal between correct and incorrect trials. The results did nor support this model in any of the regions tested. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 11:04:22