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Lennox-Gastaut syndrome – A childhood epilepsy syndrome that usually starts when a child is 3 – 5 years old but can start as late as adolescence. The child may have several different types of seizure, including atonic seizures (drop attacks). They may also have learning and behavioural problems.

Lesion – any abnormality or damage in the tissue of any organ, such as the brain.

Licensing  – the official process of showing that drugs have been tested and are safe to use.

Limbic system  – the part of the brain made up of the hypothalamus, hippocampus and amygdala. It controls instinct and self-preservation (for example the drive to find food or to fight) and has an important function in memory. These are also areas where epilepsy often starts.

Lobe – an area of the brain. The brain is made up of two halves (or hemispheres): the right and left half. Each half has four lobes: the frontal, temporal, occipital and parietal lobes.