Review this  week's reading, which introduced the role of neurotransmitters in human  behavior and personality.  Use the Ashford University Online Library to  locate one peer-reviewed research study which was published in the last  five years and that implicates a neurotransmitter as the cause of an  abnormal behavior (psychological disorder).  Clearly indicate in your  discussion: 
 
 a.   The abnormal behavior being studied.
 b.   The neurotransmitter that is implicated.
 c.   The role of the neurotransmitter in the expression of the abnormal behavior.