Abstract: Over recent decades, parahippocampal neurons have provided a powerful window into how the brain generates a sense of location. Once thought to supply a stable “GPS-like” code, these circuits are now understood to form flexible, adaptive maps that integrate self-motion, sensory cues, internal state, and experience. My lab investigates the mechanisms that construct these maps and the circuit- and state-dependent factors that drive their reorganization. In this talk, I’ll discuss emerging evidence that internal maps undergo rapid transitions and longer-timescale plasticity in novel or behaviorally demanding environments, revealing how the brain updates spatial representations to support navigation and memory.