In 1954, the limbic cortex was described by neuroanatomists. Since that time, the limbic system of the brain has been implicated as the seat of emotion, addiction, mood, and lots of other mental and emotional processes. It is the part of the brain that is phylogenetic ally very primitive.n 1954, the limbic cortex was described by neuroanatomists. Since that time, the limbic system of the brain has been implicated as the seat of emotion, addiction, mood, and lots of other mental and emotional processes. It is the part of the brain that is phylogenetic ally very primitive.