Another set of girls in the pilot experiment received their training through a simple computer game instead. In this game, a pair of faces appeared on a screen every few seconds: they would be either neutral and sad, or neutral and happy. Then a dot replaced one of the faces, and the “game” was to click on the dot. For the eight girls in the control group, the face replaced by the dot was selected at random, but for eight girls in the experimental group, the dot always replaced the more positive face in the pair. Over a week of playing this game daily, these girls were in effect being trained to avoid looking at the sad faces.
himself originally found this concept, called attentional-bias training, so simplistic that he bet Colin MacLeod, a psychologist at the University of Western Australia in Perth who pioneered the technique, that it would not alter psychological symptoms. Gotlib lost his bet.