Protegal (1996)
Direct stimulation of an area of the amygdala in hamsters produces aggressive behaviour.
Charles Whitman (1966)
Killed 16 people by gunshot from the top of a building and left a note asking to inspect his brain. A tumour was found pressing on his amygdala.
Siegel & Pott (1988)
The stimulation of the ventromedial hypothalamus results in spontaneous aggression.
Phillip Bard (1930s)
Procedure
- Removed the cortex in cats and made them decorticate.
Findings
- Cats became aggressive and exhibited 'sham rage'.
- Arched backs, hissing, growling and bared teeth.
Phineas Gage
Had his amygdala impaled by a pole working on a railway line and became extremely aggressive.
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