Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Human cortical networks for new and familiar sequences of saccades
Autore:
Grosbras, MH; Leonards, U; Lobel, E; Poline, JB; LeBihan, D; Berthoz, A;
Indirizzi:
CNRS, LPPA, Coll France, F-75005 Paris, France CNRS Paris France F-75005CNRS, LPPA, Coll France, F-75005 Paris, France CEA, Serv Hosp Frederic Joliot, F-91406 Orsay, France CEA Orsay France F-91406 erv Hosp Frederic Joliot, F-91406 Orsay, France HUG, CH-1225 Chene Bourg GE, Switzerland HUG Chene Bourg GE Switzerland CH-1225 -1225 Chene Bourg GE, Switzerland
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 10, volume: 11, anno: 2001,
pagine: 936 - 945
SICI:
1047-3211(200110)11:10<936:HCNFNA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-EMISSION-TOMOGRAPHY; POSTERIOR PARIETAL CORTEX; FRONTAL EYE-FIELD; FUNCTIONAL-ANATOMY; SEQUENTIAL-PROCEDURES; MOTOR SKILL; MOVEMENTS; ATTENTION; MEMORY; AREAS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Grosbras, MH CNRS, LPPA, Coll France, 11 Pl Marcelin Berthelot, F-75005 Paris, France CNRS 11 Pl Marcelin Berthelot Paris France F-75005 s, France
Citazione:
M.H. Grosbras et al., "Human cortical networks for new and familiar sequences of saccades", CEREB CORT, 11(10), 2001, pp. 936-945

Abstract

Visual exploration is organized in sequences of saccadic eye movements that depend on both perceptual and cognitive context. Using functional magnetic resonance imaging, we studied the neural basis of sequential oculomotor behavior and its dependence on different types of memory by analyzing cerebral activity during performance of newly learned and familiar sequences of eye movements. Compared to a resting condition, both types of sequences activated a common fronto-parietal network, including frontal and supplementaryeye fields, and several parietal areas. Within this network, newly learnedsequences induced stronger activation than familiar sequences, probably reflecting higher attentional demands. In addition, specific regions were recruited far the performance of new sequences, including pre-supplementary eye fields, the precuneus and the caudate nucleus. This indicates that in addition to attentional modulation, novelty of saccadic sequences requires specific cortical resources, probably related to effortful sequence preparation and coordination as well as to spatial working memory. For familiar sequences, recalled from long-term memory, we observed specific right medial temporo-occipital activation in the vicinity of the boundary between the parahippocampal and lingual gyri, as well as an activation site in the parieto-occipital fissure. We conclude that neuronal resources recruited by the gazesystem can change with the familiarity of the scanpath to be executed. This study is important to better understand how the brain implements memorized scanpaths for visual exploration and orienting.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 14:55:39