“…It seems unlikely that such disparate behaviors reflect a unitary underlying behavioral process; however, deficits in behavioral inhibition [34], waiting capacity [35], timing [36,37], behavioral switching [38], and tolerance of delay of gratification [33,39] have been proposed to encompass many of these behavioral phenomena [40]. Further, given the diversity of behaviors most often characterized by impulsivity (e.g., violence, gambling, spending sprees, substance abuse, hypersexual behavior, and self-injurious behavior), it seems it cannot be best understood as a product of a single appetitive or a particular consumed substance.…”