Latencies in fMRI time-series: effect of slice acquisition order and perception
| Autor: | Anne-Lise Paradis, Denis Le Bihan, B. Cerf, Pierre-Francois Van de Moortele, Annick Faurion, E. Lobel |
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| Přispěvatelé: | Laboratoire de Physiologie de la Perception et de l'Action (LPPA), Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS), Université du Québec à Montréal = University of Québec in Montréal (UQAM), Danone Research, Groupe DANONE, IFR de Neuroimagerie Fonctionnelle (IFR 49), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service Hospitalier Frédéric Joliot (SHFJ), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service NEUROSPIN (NEUROSPIN), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Le Bihan, Denis |
| Rok vydání: | 1997 |
| Předmět: |
Time Factors
genetic structures [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging Computer science media_common.quotation_subject Speech recognition Stimulus (physiology) MESH: Perception MESH: Magnetic Resonance Imaging Correlation MESH: Brain Perception Image Processing Computer-Assisted Humans Waveform Bold fmri MESH: Data Collection Radiology Nuclear Medicine and imaging Chemical senses MESH: Brain Mapping Spectroscopy media_common Brain Mapping Signal processing MESH: Humans Data Collection MESH: Time Factors Brain Time shifting Magnetic Resonance Imaging MESH: Image Processing Computer-Assisted Oxygen [SDV.IB.IMA] Life Sciences [q-bio]/Bioengineering/Imaging Molecular Medicine MESH: Oxygen |
| Zdroj: | NMR in Biomedicine NMR in Biomedicine, Wiley, 1997, 10 (4-5), pp.230-6 HAL Scopus-Elsevier NMR in Biomedicine, 1997, 10 (4-5), pp.230-6 |
| ISSN: | 1099-1492 0952-3480 |
| DOI: | 10.1002/(sici)1099-1492(199706/08)10:4/5<230::aid-nbm470>3.0.co;2-w |
| Popis: | International audience; In BOLD fMRI a detailed analysis of the MRI signal time course sometimes shows time differences between different activated regions. Some researchers have suggested that these latencies could be used to infer the temporal order of activation of these cortical regions. Several effects must be considered, however, before interpreting these latencies. The effect of a slice-dependent time shift (SDTS) with multi-slice acquisitions, for instance, may be important for regions located on different slices. After correction for this SDTS effect the time dispersion between activated regions is significantly decreased and the correlation between the MRI signal time course and the stimulation paradigm is improved. Another effect to consider is the latency which may exist between perception and stimulus presentation. It is shown that the control of perception can be achieved using a finger-spanning technique during the fMRI acquisition. The use of this perception profile rather than an arbitrary waveform derived from the paradigm proves to be a powerful alternative to fMRI data processing, especially with chemical senses studies, when return to baseline is not always correlated to stimulus suppression. This approach should also be relevant to other kinds of stimulation tasks, as a realistic way of monitoring the actual task performance, which may depend on attention, adaptation, fatigue or even variability of stimulus presentation. |
| Databáze: | OpenAIRE |
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