The study investigates neural ensembles in the CA3 region of rats during decision-making tasks, focusing on the transient but repeatable phenomenon of spatial representations sweeping forward at decision points. The researchers recorded neural activity from rats running on T-based decision tasks, such as the multiple-T maze and cued-choice task. They found that when rats paused at critical decision points, the reconstructed spatial representations from the neural ensemble swept forward, first down one path and then the other, indicating the consideration of future possibilities rather than recent paths. These representations were coherent and preferentially swept ahead of the animal, suggesting they represented future options. Similar phenomena occurred during error correction. Local field potentials from these sites contained pronounced theta and gamma frequencies but no sharp wave frequencies. The study suggests that hippocampal spatial processing is an active, cognitive process influenced by task demands and experience, rather than a passive computation.The study investigates neural ensembles in the CA3 region of rats during decision-making tasks, focusing on the transient but repeatable phenomenon of spatial representations sweeping forward at decision points. The researchers recorded neural activity from rats running on T-based decision tasks, such as the multiple-T maze and cued-choice task. They found that when rats paused at critical decision points, the reconstructed spatial representations from the neural ensemble swept forward, first down one path and then the other, indicating the consideration of future possibilities rather than recent paths. These representations were coherent and preferentially swept ahead of the animal, suggesting they represented future options. Similar phenomena occurred during error correction. Local field potentials from these sites contained pronounced theta and gamma frequencies but no sharp wave frequencies. The study suggests that hippocampal spatial processing is an active, cognitive process influenced by task demands and experience, rather than a passive computation.