 Human electroencephalography, first practiced in 1920, was applied to the study of creativity in the early 1970s.As "in vivo" brain imaging has become more sophisticated, investigations of positive neuroscience phenomena have incorporated multiple functional neuroimaging techniques (functional magnetic resonance imaging and Positron Emission Tomography) and structural imaging (Diffusion MRI, voxel-based morphometry, in vivo magnetic resonance spectroscopy).Examples of research centers currently active in the field of positive neuroscience include Martin Seligman's lab at the University of Pennsylvania and Rex Jung's lab at the University of New Mexico, supported by The Mind Research Network.