Choice task.

<p>Participants were asked to use their knowledge of the sequential transition structure to make decisions for reward. Choice rounds consisted of three steps. First, participants observed the reward amount and target image for one second. Next, they were given five seconds to choose one of two images to start the sequence from again. This choice was of varying difficulty, depending on how likely it was for each choice image to be followed by the reward image. For the next several presentations after choice, each observation of the valued image was accompanied by reward. (Images shown here are not those used in the study, but public domain stand-ins from clker.com that reflect the category of the photographs used during the experiment.)