Reference : Brain activation induced by estimation of duration : A PET study
Scientific journals : Article
Social & behavioral sciences, psychology : Neurosciences & behavior
http://hdl.handle.net/2268/29958
Brain activation induced by estimation of duration : A PET study
English
Maquet, Pierre mailto [Université de Liège - ULg > > Centre de recherches du cyclotron]
Lejeune, Helga mailto [Université de Liège - ULg > > Unité de psychobiologie des processus temporels >]
Pouthas, V. [> > > >]
Kirsch, Murielle mailto [Centre Hospitalier Universitaire de Liège - CHU > > Anesthésie et réanimation >]
Casini, L. [> > > >]
Macar, F. [> > > >]
Timsit-Berthier, M. [> > > >]
Vidal, F. [> > > >]
Ferrara, André mailto [Université de Liège - ULg > Département des sciences cognitives > Neuroscience comportementale et psychopharmacologie expér. >]
Degueldre, Christian mailto [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Quaglia, L. [> > > >]
Delfiore, Guy [> > > >]
Luxen, André mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie organique de synthèse - Centre de recherches du cyclotron >]
Woods, R. [> > > >]
Mazziotta, J. C. [> > > >]
Comar, D. [> > > >]
Apr-1996
Neuroimage
Academic Press Inc Elsevier Science
3
2
119-126
Yes (verified by ORBi)
International
1053-8119
San Diego
[en] time ; perception ; PET Study
[en] Duration information about a visual stimulus requires processing as do other visual features such as size or intensity. Using positron emission tomography, iterative (H2O)-O-15 infusions, and statistical parametric mapping, we investigated the neural correlates of time processing. Nine normal subjects underwent six serial rCBF. Three tasks were studied: (a) Atemporal generalization task (D task) in which the subjects had to judge (by pressing one of two keys) whether the duration of the illumination of a green LED was equal to or different from that of a previously presented standard; (b) An intensity generalization task. (I task) in which the judgment concerned the intensity of the LED; and (c) A control task (C task) in which the subjects had to press one of the two keys at random in response to LED illumination. A significant increase in rCBF during the D task, compared to that during the C task, was observed in right prefontal cortex, right inferior parietal lobule, anterior cingulate cortex, vermis, and a region corresponding to the left fusiform gyrus. A significant increase in rCBF during the I task, compared to that during the C task, was observed in right prefontal cortex, right inferior parietal lobule, right extrastriate cortex, anterior cingulate cortex, left inferior parietal lobule, vermis, and two symmetrical regions corresponding to the fusiform gyri. No significant activation was observed in the D task when compared to that in the I task. We propose that these cortical maps are best explained by the recruitment of visual attention and memory structures, which play a major role in prospective time judgements as indicated by behavioral studies. The data also suggest that the temporal dimension of a visual stimulus is processed in attributes. the same areas as other visual attributes.
http://hdl.handle.net/2268/29958
10.1006/nimg.1996.0014
http://www.elsevier.com/wps/find/journaldescription.cws_home/622925/description#description

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