Interneurons and network activity in the cerebral cortex: a developmental dialogue.

Interneuron subtypes in the developing mammalian cerebral cortex orchestrate spontaneous activity transitions, including a shift from gap-junction synchrony to synaptically driven bursts and later sparse firing.

• Why it matters: Early postnatal cortical activity emerges before sensory experience, yet how interneurons and network dynamics shape each other during circuit formation remains a key gap.
• What they did: The work synthesizes rodent evidence for bidirectional control, where interneurons regulate spontaneous activity patterns and activity-dependent mechanisms shape interneuron wiring, survival, and differentiation.
• The result: This reciprocal dialogue is linked to establishing functional cortical circuits, with subtype-specific maturation timelines coordinating network transitions from early synchronous events to mature sparse firing.

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