Extract from Ron Johnson's book exclusive to the Guardian:
...In the mid-60s, Hare was working as a prison psychologist in Vancouver. He put word around the prison that he was looking for psychopathic and non-psychopathic volunteers for tests. He strapped them up to various EEG and sweat- and blood pressure-measuring machines, and also to an electricity generator, and explained to them that he was going to count backwards from 10 and when he reached one they'd receive a very painful electric shock.
The difference in the responses stunned Hare. The non-psychopathic volunteers (theirs were crimes of passion, usually, or crimes born from terrible poverty or abuse) steeled themselves ruefully, as if a painful electric shock were just the penance they deserved. They were, Hare noted, scared.
"And the psychopaths?" I asked.
"They didn't break a sweat," said Hare. "Nothing." The tests seemed to indicate that the amygdala, the part of the brain that should have anticipated the unpleasantness and sent the requisite signals of fear to the central nervous system, wasn't functioning as it should. It was an enormous breakthrough for Hare, his first clue that the brains of psychopaths were different from regular brains...
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