Reward prediction error and declarative memory

Learning based on reward prediction error (RPE) was originally proposed in the context of non-declarative memory. We postulate that RPE may support declarative memory as well. Indeed, recent years have witnessed a number of independent empirical studies reporting effects of RPE on declarative memory. In this paper, we provide a brief overview of these studies, point out emerging patterns, and identify open issues such as the role of signed versus unsigned RPEs in declarative learning.