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The video analyses why psychopaths show such emotional coldness, and describes how they respond to stress. In addition, the main chemical imbalances, both in neurotransmitters and hormones, that characterise the functioning of their brain are explained, with special reference to serotonin, testosterone and cortisol. The information provided in the video is based on scientific research and has been verified by Dr. Luis Moya Albiol, Professor of Psychobiology at the University of Valencia.