Improved spatial localization of post-stimulus BOLD undershoot relative to positive BOLD
نویسندگان
چکیده
منابع مشابه
Improved spatial localization of post-stimulus BOLD undershoot relative to positive BOLD.
The negative blood oxygenation level-dependent (BOLD) signal following the cessation of stimulation (post-stimulus BOLD undershoot) is observed in functional magnetic resonance imaging (fMRI) studies. However, its spatial characteristics are unknown. To investigate this, gradient-echo BOLD fMRI in response to visual stimulus was obtained in isoflurane-anesthetized cats at 9.4 T. Since the middl...
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The interpretation of the blood-oxygenation level-dependent (BOLD) post-stimulus undershoot has been a topic of considerable interest, as the mechanisms behind this prominent BOLD transient may provide valuable clues on the neurovascular response process and energy supply routes of the brain. Biomechanical theories explain the origin of the BOLD undershoot through the passive ballooning of post...
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Purpose A dual-echo spiral arterial spin labeling (ASL) technique provides simultaneous measurements of cerebral blood flow (CBF) and BOLD responses to brain activation, and has been applied in a calibrated-BOLD methodology to assess the coupling of CBF and the cerebral metabolic rate of O2 (CMRO2) [1-3]. However, the potential of this approach to provide a quantitative probe of the CBF and BOL...
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Measuring the hemodynamic response with functional magnetic resonance imaging (fMRI) together with functional near-infrared spectroscopy (fNIRS) may overcome limitations of single-method approaches. Accordingly, we measured the event-related hemodynamic response with both imaging methods simultaneously in young subjects during visual stimulation. An intertrial interval of 60 s was chosen to inc...
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ژورنال
عنوان ژورنال: NeuroImage
سال: 2007
ISSN: 1053-8119
DOI: 10.1016/j.neuroimage.2006.10.016