You can thus determine where in the brain that stimulus is dealt with. Evoked potentials can be used to determine whether a person is looking at a stimulus presented on a screen. The brain is not the only source of electrical potentials. An Electrooculogram is similar to an electromyogram but the sensors are placed on the muscles around the eyes. NMR NMR stands for Nuclear Magnetic Resonance and is the same technique as used in MRI .
Atoms have an inherent rotation that is usually in a random direction.
When exposed to a magnetic field, they will align. When the magnetic field is turned off, they will release a little bit of energy that can be measured. See MRI for a more detailed description of the technique. CBF CBF stands for Cerebral Blood Flow and is an ingenious method for determining brain activity. Well, the neurons of the brain, like any other cells in the body, require nutrients to work.