Statistical parametric mapping: Difference between revisions

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==The statistical parametric mapping approach==

===Unit of measurement===

Functional neuroimaging, one type of 'brain scanning', involves the measurement of brain activity. The specific technique used to measure brain activity depends on the imaging technology being used (see [[fMRI]] and [[Positron Emission Tomography|PET]] for examples). Regardless of which technology is used, the scanner produces a 'map' of the area being scanned that is represented as [[voxel]]s. Each voxel typically represents the activity of a particular co-ordinatecoordinate in three dimensional space. The exact size of a voxel will vary depending on the technology used, although fMRI voxels typically represent a volume of 27 mm³ (a cube with 3mm length sides).

===Experimental design===