Linear transform model (MRI): Difference between revisions

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The '''linear transform model''' refers to a fundamental assumption guiding the analysis of [[functional Magnetic Resonance Imaging]] (fMRI) studies. Specifically, the model holds that the fMRI signal is approximately proportional to a measure of local neural activity, averaged over a spatial extent of several millimeters and over a time period of several seconds.

== Debate ==

The linear transform model is a common and widespread assumption used in the interpretation of fMRI studies. However, some scientists suggest reasons exist to remain sceptical. [[David Heeger|Heeger]] and Ress, in a review of fMRI and its relation to neuronal activity, argue that it is a reasonable and useful approximation for local neural activity "for some recording sites, in some brain areas, using certain experimental protocols", but it is not under other circumstances.<ref>Heeger, D.J. & Ress, D. (February 2002). What does fMRI tell us about Neuronal Activity?, ''Nature Reviews'', Volume 3, 142-151.</ref>

== See also ==

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[[Category:Magnetic resonance imaging]]

[[Category:Neuroimaging]]

[[Category:Cognitive science]]

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