Human behavior is particularly flexible, which allows us to adapt to continuously changing conditions and situations. How is that possible, how do we achieve this adaptivity? The project METACONTROL assumes that humans can perceive, decide, and act under different mental modes—"metacontrol modes" as we call them. Sometimes people tend to be more *persistent*, keeping and following their current goal even under challenging conditions, and ignoring any information that is unrelated to the current goal. This is useful to keep going, to reach challenging goals, and to avoid distractions and temptations. But sometimes people can also be more *flexible*, which may include trading one’s current goal for another, more promising one. Such a mode is useful when working on an unrealistic, over-challenging goal, or when more interesting, more rewarding alternative goals are available.
The aim of this project was to characterize and better understand the mental set allowing us to be persistent or flexible and study the conditions under which people tend to be more persistent and when they are more flexible. We were also interested to see when and how people tend to switch between persistence and flexibility, which would make them particularly adaptive. We also aimed to study the brain processes involved in being persistent or flexible, and in creating models that allow us to predict when people are persistent or flexible, and which individuals tend to be more persistent or more flexible overall. Finally, the project aims to characterize the consequences of being persistent or flexible with respect to human performance and social interaction.