Neuroscience investigates the human brain, from the functional organization of large scale cerebral systems to microscopic neurochemical processes. Topics include the neural substrates of perception, attention, memory, language, learning, neurological disorders, affect, stress and motivation. A variety of experimental techniques are used, including functional magnetic resonance imaging (fMRI), electro/magneto-encephalogry (EEG/MEG), and transcranial magnetic stimulation (TMS).