Fig. 2.

Task Design. Each trial started with a fixation cross at the centre of the screen for 1–3 seconds followed by the presentation of two differently coloured doors. Two seconds were provided for participants to choose one of these doors and their choice was indicated immediately by a black frame around the chosen door (not shown). Outcome images varied based on door contingencies (Table 2) and could be a liked image, a not-liked image or a noise image. Images were presented for two seconds.