In the past few years, there have been several studies on psychopathic personalities. Psychopathology has always been considered a psychological theory of crime. With these new studies (where they have tested the firing neurons in the brain), there is now a controversy over whether a psychopath would fall under the category of a psychological or biological theory.
For example, one study showed incarcerated psychopaths a series of slides that showed not only photos of happy families and pleasant landscapes but also photos of gruesome crime scenes. It was noted that in what was deemed the normal population, the neurons fired in several sections of the brain when the pleasant photos were shown and in a different section when the gruesome photos were shown. In the psychopathic population, all neurons fired in the same area of the brain.
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