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Titolo:
Brain regions involved in spatial frequency discrimination: evidence from fMRI
Autore:
Greenlee, MW; Magnussen, S; Reinvang, I;
Indirizzi:
Univ Oldenburg, Dept Psychol, D-26111 Oldenburg, Germany Univ Oldenburg Oldenburg Germany D-26111 hol, D-26111 Oldenburg, Germany Univ Oslo, Dept Psychol, N-0316 Oslo, Norway Univ Oslo Oslo Norway N-0316 niv Oslo, Dept Psychol, N-0316 Oslo, Norway Univ Freiburg, Dept Neurol, D-7800 Freiburg, Germany Univ Freiburg Freiburg Germany D-7800 t Neurol, D-7800 Freiburg, Germany
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 3, volume: 132, anno: 2000,
pagine: 399 - 403
SICI:
0014-4819(200006)132:3<399:BRIISF>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORIENTATION DISCRIMINATION; WORKING-MEMORY; SUSTAINED ACTIVITY; PERCEPTUAL MEMORY; SYSTEM; CORTEX; TASKS;
Keywords:
functional magnetic resonance imaging (fMRI) perceptual discrimination; spatial frequency; human; visual cortex; psychophysics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Greenlee, MW Univ Oldenburg, Dept Psychol, A6 2-209, D-26111 Oldenburg, Germany Univ Oldenburg A6 2-209 Oldenburg Germany D-26111 g, Germany
Citazione:
M.W. Greenlee et al., "Brain regions involved in spatial frequency discrimination: evidence from fMRI", EXP BRAIN R, 132(3), 2000, pp. 399-403

Abstract

The cortical areas underlying successive spatial-frequency discrimination were explored using functional magnetic resonance imaging (fMRI). In a steady-state, block-design paradigm, 12 subjects viewed a single fixation crossduring a rest period, followed by an activation period consisting of the presentation of horizontal (distractors) and vertical (targets) sinewave gratings, Two tasks were performed: in the control task, subjects pressed a button after the second vertical grating was presented within each trial; in the discrimination task, subjects decided which target grating had the higher spatial frequency. Post-processing consisted of off-line image registration to correct for head motion, spatial and temporal smoothing, and cross-correlation between each voxel time course and a phase-shifted stimulus timeprofile. The results indicate that striate, extrastriate, parietal, and prefrontal areas show significant BOLD (blood oxygen level dependent) effectsduring both discrimination and control tasks, with consistently higher activity levels in the discrimination task.

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Documento generato il 27/09/20 alle ore 13:34:37