fMRI, EEG and MEG techniques enable researchers to investigate large-scale neural networks at different spatial and temporal resolutions. Functional connectivity between brain regions is measured at a spatial resolution as low as 2-3 millimeters using fMRI and at about 5-30 millimeters with EEG/MEG. fMRI and neurophysiological techniques contrast most sharply in their temporal and spatial resolutions, which differ by three orders of magnitude (seconds versus milliseconds). Structural connectivity within networks can be measured at a spatial resolution of 3-6 millimeters using diffusion tensor imaging (DTI).
