Overview
- The Nature Communications paper, reported Monday, maps mouse CA3 connectivity at early postnatal, juvenile, and adult stages using side‑by‑side recordings.
- Researchers found that newborn CA3 networks look dense and random, then mature into sparse, distributed, and structured wiring that supports efficient memory coding.
- Single connections lose strength over development so one input can trigger a spike early on but adult neurons need several inputs to fire, changing how information is combined.
- The team used multicellular patch‑clamp recordings with advanced microscopy and pinpoint laser activation to trace who connects to whom and how signals flow.
- Models based on Hebbian learning and pattern completion point to better storage and recall after pruning, though the work was done in mouse tissue and the exact experience‑driven mechanisms remain to be pinned down.