Figure 1
The task started with a baseline measure of arousal (“How do you feel?”) and craving (“How much are you craving cocaine at this moment?”). Then, a total of 12 blocks were shown in random order, which consisted of 3 emotionally negative blocks, 3 cocaine blocks, 3 control blocks matched to the emotionally negative blocks and 3 control blocks matched to the cocaine block. Each block consisted of 10 images (total 120 images) and were shown for 2.5 seconds. Both craving and affect were assessed after every block.