PMID: 9430353Jun 1, 1997Paper

Latencies in fMRI time-series: effect of slice acquisition order and perception

NMR in Biomedicine
P F Van De MoorteleD Le Bihan

Abstract

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 ...Continue Reading

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Citations

Dec 7, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·V CalhounG Pearlson
Jul 12, 2002·Human Brain Mapping·Vince D CalhounGodfrey D Pearlson
May 14, 2010·Pediatric Radiology·Loukas G Astrakas, Maria I Argyropoulou
May 10, 2000·Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie·D Le Bihan
May 15, 2003·Current Opinion in Neurobiology·Elia Formisano, Rainer Goebel
Aug 16, 2011·Journal of Agricultural and Food Chemistry·Diego L García-GonzálezRamón Aparicio
Jul 22, 2011·ISRN Obstetrics and Gynecology·Lamina Mustafa Adelaja, Oladapo Olufemi Taiwo
Jul 19, 2011·Brain Research·Yuko NakamuraKazunori Yoshiura
Mar 6, 2009·Magnetic Resonance Imaging·Fabrizio EspositoFrancesco Di Salle
Apr 16, 2005·Human Brain Mapping·Baoming HongVince D Calhoun
Dec 23, 2003·Human Brain Mapping·Vince D CalhounGodfrey D Pearlson
Feb 1, 2006·Human Brain Mapping·Adriana AragriFrancesco Di Salle
Mar 11, 2009·IEEE Transactions on Information Technology in Biomedicine : a Publication of the IEEE Engineering in Medicine and Biology Society·Vince D Calhoun, Tülay Adali
Jun 15, 2004·NeuroImage·Barbara Cerf-Ducastel, Claire Murphy
Aug 19, 2004·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Vince D CalhounGodfrey D Pearlson
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Sep 17, 2005·Applied Psychophysiology and Biofeedback·V D CalhounG D Pearlson

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