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Titolo:
Multiple neural correlates of detection in the human brain
Autore:
Shulman, GL; Ollinger, JM; Linenweber, M; Petersen, SE; Corbetta, M;
Indirizzi:
Washington Univ, Dept Neurol & Neurol Surg, St Louis, MO 63110 USA Washington Univ St Louis MO USA 63110 Neurol Surg, St Louis, MO 63110 USA Washington Univ, Dept Radiol, St Louis, MO 63110 USA Washington Univ St Louis MO USA 63110 Dept Radiol, St Louis, MO 63110 USA Washington Univ, Dept Anat & Neurobiol, St Louis, MO 63110 USA Washington Univ St Louis MO USA 63110 & Neurobiol, St Louis, MO 63110 USA
Titolo Testata:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
fascicolo: 1, volume: 98, anno: 2001,
pagine: 313 - 318
SICI:
0027-8424(20010102)98:1<313:MNCODI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRONTAL EYE-FIELD; VISUOSPATIAL ATTENTION; AREAS; MACAQUE; MOTION; ACTIVATION; PERCEPTION; SELECTION; CORTEX; MT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Shulman, GL Washington Univ, Dept Neurol, Box 8111,660 S Euclid St, St Louis, MO 63110USA Washington Univ Box 8111,660 S Euclid St St Louis MO USA 63110
Citazione:
G.L. Shulman et al., "Multiple neural correlates of detection in the human brain", P NAS US, 98(1), 2001, pp. 313-318

Abstract

We used event-related functional MRI to examine the neural consequences ofdetecting the presence or absence of a stimulus. Subjects detected a briefinterval of coherent motion embedded in dynamic noise that was presented throughout a test period. Several brain regions, including V1/V2, middle temporal complex (MT+), left intraparietal cortex, and the frontal eye field, were activated at the onset of the dynamic noise, irrespective of whether acoherent motion target was presented early or late in the test period, or not at all. These regions, many of which were motion sensitive, were likelyinvolved in searching for and detecting the target. The blood oxygenation level-dependent signal in these regions was higher in trials in which a target was detected than in trials in which it was missed or not presented, indicating that these regions were modulated by detection. Moreover, the blood oxygenation level-dependent signal in these regions decayed quickly once a target was detected, even though the dynamic noise continued to be displayed, indicating that they were shut down after detection. Therefore, detection-related modulations occurred in the same regions that accumulate targetinformation over time, in agreement with current psychological and neural models of detection. Many other regions, however, including areas in prefrontal cortex and anterior cingulate, were not involved in searching for a target. In these regions, activation began early in the test period when an early target was detected but began late in the test period when a late target was detected or when a response was correctly withheld in the absence ofa motion target. The signal in these regions was therefore triggered by a discrete event during the test interval that was related to presence-absence detection.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:30:09