Everyday decisions are often based on both external cues and internal hunches. How does the brain put these together? We addressed this question in mice trained to make decisions based on combinations of sensory cues and history of reward value or probability. While mice made these decisions, we recorded from thousands of neurons throughout the brain and causally probed the roles of cortical areas. The results are not what we thought based on textbook notions of how the brain works. This talk is based on work led by Nick Steinmetz, Peter Zatka-Haas, Armin Lak, and Pip Coen, in the laboratory I share with Kenneth Harris. Zoom link: https://weizmann.zoom.us/j/95406893197?pwd=REt5L1g3SmprMUhrK3dpUDJVeHlrZz09 Meeting ID: 954 0689 3197 Password: 750421