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Interstitial Radiosurgery

A type of radiosurgery which involves the temporary placement of radioactive seeds into the HH tissue. These radioactive seeds emit gamma radiation with minimal delivery of harmful radiation to normal surrounding structures.

Interictal psychosis

Thought disorder, often with delusions, hallucinations or emotional changes that are temporarily related to the occurrence of seizures in people with epilepsy. Usually lasts 3-6 months.

Interictal epileptiform

Epilepsy waves recorded between seizures.

Interictal

Referring to the period between seizures.

Inhibitory

Shutting off or decreasing brain electrical activity; causing nerve cells to stop firing.

Infantile spasm

A sudden jerk followed by stiffening; spasms usually begin between age 3 and 12 months and usually stop by age 2 to 4 years, although other seizure types often develop; in some spells, the arms are flung out as the body bends forward (“jackknife seizures”), but in others the movements are more subtle.

Individuals with Disabilities Education Act (IDEA)

A U.S. federal law ensuring that all handicapped children receive appropriate education at no cost and in the least restrictive environment.

Incidence

The number of new cases of a disorder occurring in a population during a specified period.

Impulse Control Disorder

A disorder characterized by an inability to resist the impulse to perform an action that is harmful to one’s self or others.

Idiopathic generalized epilepsies

Epilepsy syndromes characterized by onset from both hemispheres of the brain simultaneously; often genetic.