These are trial-by-trial choice data of the Iowa Gambling Task, published in:
Ahn, W.-Y., Vasilev, G., Lee, S., Busemeyer, J. R., Kruschke, J. K., Bechara A., & Vassileva, J. (2014) Decision-making in stimulant and opiate addicts in protracted abstinence: evidence from computational modeling with pure users. Frontiers in Psychology (Decision Neuroscience).
Please unzip "rawData.zip" and read "ReadMe.txt" for more details.