One theory of borderline personality disorder, called the triple vulnerabilities model, states that the disorder is the result of a deficiency in the level of the neurotransmitters serotonin and norepinephrine in the caudate nucleus.

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While there are various theories about the causes of borderline personality disorder, there is currently no consensus that it is the result of a deficiency in specific neurotransmitters in the caudate nucleus.

One Theory of Borderline Personality Disorder, Called the Triple Vulnerabilities