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Juvenile myoclonic epilepsy (JME) – a type of childhood epilepsy syndrome that starts between the ages of 11 and 18 years. The person usually has myoclonic seizures when they are waking up, and might also have absences and tonic clonic seizures. This syndrome usually responds well to medication.

Jacksonian seizure – A type of focal seizure in the frontal lobe which usually begins with twitching or trembling of one hand or one finger, then the movement spreads up the arm. The seizure is usually short-lived and the person does not lose consciousness. Also known as ‘Jacksonian march’.

Jamais vu - the feeling that ‘I’ve never seen this before’ when looking at something that is familiar. Jamais vu can happen in people who do not have epilepsy but can also be part of a simple focal seizure.