The emergence of GABAergic microcircuits in the cortex

A baby’s brain rewires itself at breathtaking speed—forming and breaking millions of connections every second—yet somehow stays stable enough to learn, remember, and think. This project tackles a fundamental puzzle in neuroscience: how do developing brain circuits remain stable while constantly changing? The researchers focus on a specific class of neurons called cortical interneurons, which release the chemical GABA to dampen or modulate activity in the cortex. During development, these interneurons wire themselves into local microcircuits, but no one knows exactly when these circuits emerge, what rules govern their wiring, or how they keep the larger network from tipping into chaos. This is curiosity-driven fundamental science. There is no immediate clinical or technological application. The goal is to understand a core principle of brain development—how stability and plasticity coexist. If successful, the work will provide the first detailed description of how inhibitory circuits form and stabilise in the developing cortex. That knowledge could eventually inform treatments for neurodevelopmental disorders such as epilepsy or autism, where inhibitory circuits are thought to malfunction. But for now, the value lies in answering a question that has puzzled neuroscientists for decades: how does a constantly changing brain stay itself?