This includes recording electrical waves with electroencephalography (EEG) and neural imaging with magnetic resonance (MRI). Developed in the 1930s, EEG is the oldest system for directly measuring brain activity. It is still widely used.
Brain imaging is used for structural exploration (hunting for a tumor) and functional examinations (what part of the brain is in use now). Both are valuable for identifying damaged regions, Alzheimer’s disease and stokes.