Bratty v A-G for Northern Ireland [1963]

1. Facts:

• D killed someone during an epileptic fit and claimed he was not responsible due to his condition.

2. Outcome:

• D was convicted of murder.

• The court defined "disease of the mind" as a disorder of brain functions lasting longer than a day.

3. Impact and Analysis:

• Definition of ‘Disease of the Mind’: Emphasised that even temporary conditions affecting brain function can be considered a disease of the mind.

• Sullivan Extension: In Sullivan, it was clarified that the disorder must persist for a minimum of a month to qualify, further refining the criteria for insanity.

• Legal Precedent: Strengthened the criteria for what constitutes a "disease of the mind," influencing subsequent cases involving mental health defences.