Figure 1.

Schematic of relationships between observable ‘impulsive’ behaviors, processes that may lead to these behaviors and laboratory tasks that measure the processes. ‘Difficulty awaiting turn’ refers to a common symptom of ADHD, ‘difficulty resisting drink’ refers to a drug-related behavior that involves impulsivity. Any of the three processes, behavioral inhibition, delay discounting and inattention, may contribute to these maladaptive behaviors