Acetylcholine: Neurotransmitter acting in both the peripheral nervous system (PNS) and central nervous system (CNS). It is linked to memory and learning.
Axon: A long fiber of a nerve cell (a neuron) that acts somewhat like a fiber-optic cable carrying outgoing messages.
Cholinergic system : It is a neurotransmitter system involved in the regulation of memory and learning, acetylcholine is used for transmitting nerve impulses trough nerve cells.
COMPASS : acronym for Computerised Mental Performance Assessment System. It is a battery of tests to measure mood and cognitive performance.
Myelin: A white, fatty material, composed of lipids and lipoproteins, that surrounds and protects the axons of nerves.
Neurotransmitter: substance which transmits a signal between a neuron and another cell. That signal can be modulated.