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Instead of the brainstem, where Jim was aiming, his electrode ended up roughly in the septal area of the brain, likely in something called the nucleus accumbens.

The medical report listed the cause of death as cardiac arrest, caused by the enlargement of the heart, caused by the atrial septal defect.

Roughly one in every 770 babies in the U.S. are born with an atrial septal defect each year, the federal agency says.

It may also cause an atrial septal defect, which opens a hole between the left and right upper chambers.

Heath was particularly interested in the septal region, which had been linked to pleasure.