Oscillations in Cerebral Haemodynamics

The blood oxygenation level dependent (BOLD) contrast signal in functional magnetic resonance imaging (fMRI) provides highly spatially resolved deoxygenation maps of the activated cortex (Turner 1995). In common with many other activation measurement techniques, (including optical measurements) fMRI relies upon multiple repetition of the stimulus followed by signal averaging, baseline subtraction and extensive thresholding techniques to provide difference images of activation.

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