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==Approach==
===Unit of measurement===
Functional neuroimaging is one type of 'brain scanning'. It involves the measurement of brain activity. The measurement technique depends on the imaging technology (e.g., [[fMRI]] and [[Positron Emission Tomography|PET]]). The scanner produces a 'map' of the area that is represented as [[voxel]]s. Each voxel represents the activity of a specific volume in three-dimensional space. The exact size of a voxel varies depending on the technology. fMRI voxels typically represent a volume of 27 mm<sup>3</sup>
===Experimental design===
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