Computer generated image of adult human brain, in rear view. The red regions denote cerebrum (ie the 2 cerbral hemispheres), which initiates & coordinates all voluntary activities in the body; the outer cortex is seat of intelligent behaviour. The blue-white area in centre is the mid-brain, the unit which maintains vital functions after birth, while the cerebrum is developing. The lower orange area is the cerebellum (divided like the cerebrum into white & grey matter), which controls balance & voluntary muscle coordination. Photo from Guigoz film insNaissance du cerveau dix milliards de galaxiesins by Claude Edelmann.