Brain HealthHippocampal Theta Waves Navigate Toward Goals, Not Just Movement
Scientists at UCL have discovered that the brain's hippocampus uses rhythmic 'theta sweeps' — rapid sequential firing of place cells — to mentally project toward a remembered goal location, independent of which direction the animal is actually moving or facing. Using a specially designed maze that separates head direction, movement direction, and goal direction, researchers found these neural sequences reliably pointed toward the destination. Stronger goal-directed activity predicted correct navigational choices. A computational model reproduced the findings and generated new predictions that were confirmed experimentally. Even during rest, when the brain replays experiences via sharp-wave ripples, the activity was goal-oriented rather than replaying past routes. This work identifies theta sweeps as a core neural mechanism for real-time goal-directed planning in the hippocampus.
