Hippocampal astrocytic sequences emerge during learning and memory recall.

Hippocampal astrocytes generate time-compressed calcium sequences during learning and recall, resembling neuronal time-cell activity, in the dorsal CA1 region of mice.

• Why it matters: Understanding non-neuronal contributions to hippocampal memory processes fills a critical gap, as astrocytes may play a role in encoding temporal aspects of experiences, which has implications for memory research.
• What they did: Using one-photon calcium imaging, researchers tracked astrocytic activity in freely moving mice during contextual fear conditioning, observing sequences evoked by foot shocks and re-emerging during memory recall.
• The result: Findings reveal astrocytes contribute to hippocampal representations of temporal memory structure, linking astrocytic activity with behavioral states like freezing, and highlighting their role in associative memory encoding.