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Occipital Lobes: A region in the back of the brain which processes visual information.

Oedema: Increased water content in the brain, causing brain swelling.

Oligodendrocytes: A type of support cell in the brain that produces myelin, the fatty sheath that surrounds and insulates axons.

Open Head Injury: An injury where there is penetration of the scalp and skull through to brain tissue.

Operant: Behavior which is caused mainly by its past consequence rather than simply by its antecedents.

Optic Chiasm: The point at which the optic nerve from one eye crosses to join the other.

Output: The final stage of information processing, usually consisting of behaviors and/or feelings.