<qa>  What is the CPT?The Continuous Performance Test CPT; Conners, 1995 consists of a series of letters presented on a computer screen in rapid succession. The subject is required to press a key whenever a target stimulus is presented, and to refrain from pressing the key when the nontarget stimulus is presented. The CPT generates separate measures of inattention and impulsivity. The impulsivity score is derived from a combination of commission errors and hit reaction times. T-scores of 60 or above on commission errors and hit reaction times will be considered as an indication of impulsivity. 