I-Jan mainly does philosophy of psychology and philosophy of mind. His research focuses on the cognitive capacities called mental simulation and/or mental imagery, and how folk psychological concepts like imagination, remembering, and dreaming relate to them. Furthermore, he is also interested in the possible role of the body and the environment in mental simulation, and how A.I. simulation can(not) be compared with human simulation. Recently, he has dived into some specific topics, including how mental simulation disconnected the mind from the environment, how creativity arises from the mismatch between language and mental imagery, the relationship between agency and embodied imagination, how the social norm shapes the ability of remembering, and how we empathize with the simulated characters within our dreams.