Temporal properties of the hemodynamic response in functional MRI
نویسندگان
چکیده
منابع مشابه
Temporal properties of the hemodynamic response in functional MRI.
Today, most studies of cognitive processes using functional magnetic resonance imaging (fMRI) adopt an event-related experimental design. Highly flexible stimulation settings require new statistical models where not only the activation amount, but also the time course of the measured hemodynamic response is analyzed. It is possible to obtain statistically valid descriptions of single hemodynami...
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Functional magnetic resonance imaging is a non-invasive technique to study brain activity in humans. Among other eects, the stimulus pattern in¯uences the timecourse of activations. A non-linear regression context is proposed to quantitatively compare stimulation parameters with activation timecourses.
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Today, most studies of cognitive processes using functional MRI (fMRI) experiments adopt highly flexible stimulation designs, where not only the activation amount but also the time course of the measured hemodynamic response is of interest. The measured signal only indirectly reflects the underlying neuronal activation, and is understood as being convolved with a hemodynamic modulation function...
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Today, most studies of cognitive processes using functional MRI (fMRI) experiments adopt a single-trial design. Highly flexible stimulation paradigms require new statistical models in which not only the activation amount but also the time course of the measured hemodynamic response is analyzed. Most previous approaches have been based on a linear regression context and have introduced hemodynam...
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The standard Gaussian function is proposed for the hemodynamic modulation function (HDMF) of functional magnetic resonance imaging (fMRI) time-series. Unlike previously proposed parametric models, the Gaussian model accounts independently for the delay and dispersion of the hemodynamic responses and provides a more flexible and mathematically convenient model. A suboptimal noniterative scheme t...
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ژورنال
عنوان ژورنال: Human Brain Mapping
سال: 1999
ISSN: 1065-9471,1097-0193
DOI: 10.1002/(sici)1097-0193(1999)8:4<259::aid-hbm9>3.0.co;2-k