Fig. 1.

CR task. After 500 ms of fixation, a picture (drug, threat, or neutral) is presented for 1,500 msec followed by an auditory instruction of “Look” or “Decrease.” After 7,000 msec of picture presentation, either an attention screen (after 75% of the trials) or a “rating screen” (after the remaining 25% of the trials) was shown. During the attention screen, drug, neutral, and threat pictures were randomly presented in three of four quadrants of the screen for 1,500 msec (the fourth quadrant was left blank) (these were pictures not presented during the viewing phase within the same trial). During the “rating screen,” subjects were asked to report their “Liking” and “Wanting” for the content of the preceding image on a scale of 1 to 5 (“1” = Don’t Like/Want it at all; “5” = Like/Want it very much).