Gamified Adaptive Approach Bias Modification on Individuals With Methamphetamine Use History

In the static approach bias modification, users were instructed to swipe upward when they see portrait format images and swipe downward when they see landscape format images. A shrinking animation comes after swiping upward to simulate the visual effect of moving away (approach), and a growing animation comes after swiping downward to simulate the visual effect of moving towards (avoidance). Two types of images, namely drug-related and non-drug-related, were used in the training. The drug-related images were related to methamphetamine (methamphetamine crystals, powders, and paraphernalia), and the non-drug-related images were related to healthy lifestyles (wealth, sports, gourmet, family activities, etc).

In the adaptive approach bias modification, users were instructed to swipe upward when they see portrait format images and swipe downward when they see landscape format images. A shrinking animation comes after swiping upward to simulate the visual effect of moving away (approach), and a growing animation comes after swiping downward to simulate the visual effect of moving towards (avoidance). Two types of images, namely drug-related and non-drug-related, were used in the training. The drug-related images were related to methamphetamine (methamphetamine crystals, powders, and paraphernalia), and the non-drug-related images were related to healthy lifestyles (wealth, sports, gourmet, family activities, etc). An algorithm continuously monitors the performance of the user and adjusts the ratio of congruent and incongruent trials accordingly to attain a desired difficulty curve.