Impulsivity is considered a key symptom of BPD and has been implicated in neurobehavioral models of the disorder . According to DSM-IV, impulsivity in at least two potentially self-damaging areas such as excessive spending, promiscuity, substance abuse, binge eating, reckless driving, or physically self-damaging acts is required to fulfill the diagnostic criteria for BPD. Impulsivity has been defined as a failure to resist an impulse, despite potentially harmful consequences to oneself or others. Furthermore, criteria suggested to define impulsivity include deficient tolerance for delay of gratification and the inability to inhibit or delay voluntary behavior