as measures of impulsivity (Fillmore and Rush, 2002; Green et al., 1994). Compulsivity can be defined as elements of behavior that result in perseveration in responding in the face of adverse consequences or perseveration in the face of incorrect responses in choice situations. These elements are analogous to the symptoms of Substance Dependence as outlined by the American Psychiatric Association: continued substance use despite knowledge of having had a persistent or recurrent physical or psychological problem and a great deal of time spent in activities necessary to obtain the substance (American Psychiatric Association, 2000).
