genetically contributed by having an atenuated circuit in the brain. >> what does that mean? >> your dopamine system is stronger. to have your dopamine system ratcheted down, in order to seek the same point that normals get through more moderate indulgence, they have to go over the line. they have to be compulsive. and that drive, that compulsion, can serve you well in government or business or sports. think of all of the men we're talking about that have gotten in trouble recently. they got to the high positions they are in large part because of those drives. but, sown in the seeds of their dna is essentially an impulse disorder that manifested itself in all of this trouble that -- >> the results in the great up