science museum

Measuring activity in the brain

Your brain cells communicate by sending tiny electric signals to each other. The more signals that are sent, the more electricity the brain will produce. An EEG can measure the pattern of this electrical activity. Active areas of the brain also use more energy than less active parts - this is the basis of PET and fMRI scanning.

A 'brainwave machine' dating from the 1950s.
A 'brainwave machine' dating from the 1950s.
Science & Society Picture Library

Science Museum Home Page Who am I? Science Museum Home Page