Individual Brain Charting: HCP Gambling task

This dataset contains functional magnetic resonance images (fMRIs) of 12 subjects performing HCP Gambling task. Its aim was to localize brain structures of the reward system, namely the basal ganglia complex. The paradigm included eight blocks and each block was composed of eight events. For every event, the participants were asked to play a game. The goal was to guess whether the next number to be displayed, which ranged from one to nine, would be smaller or larger than five while a question mark was shown on the screen. The answer was given by pressing the respective button of the response box. Feedback on the correct number was provided afterwards. There was an equal amount of blocks; the participants experienced a majority of either reward or loss events in each of them. The task was constituted by eight blocks per run, in which each half related to reward and loss experience, respectively. The order of the two block cate gories was pseudo-randomized during a single run, but fixed for all participants. A fixation-cross period of fifteen seconds was displayed between blocks. All blocks contained eight trials. The trials included a question-mark visual stimulus lasting up to 1.5 seconds, a feedback period of one second and a fixation-cross period of one second, as well; the total duration of the trial was then 3.5 seconds approximately. [https://openfmri.org/dataset/ds000244/](https://openfmri.org/dataset/ds000244/) [https://neurovault.org/collections/2138/](https://neurovault.org/collections/2138/)