Simultaneous awake replay of multiple spatial representations.

Simultaneous awake replay of multiple spatial memories occurs frequently in the hippocampus during reward consumption in rats.

• Why it matters: Understanding how the hippocampus processes multiple memories during decision-making can reveal mechanisms underlying complex navigation and choice behavior.
• What they did: Researchers used a rat observational navigation task and recorded hippocampal place cell activity, finding that sequences representing different T-maze paths were often replayed together during reward consumption and in the observation box.
• The result: These simultaneous replay events reflected maze organization, converged on reward sites, and distinguished future choices, suggesting parallel hippocampal processing supports reward-directed observational navigation.