Glossary
Synaptic Pruning
What is synaptic pruning?
Synaptic pruning is the selective elimination of synaptic connections. It is part of how neural circuits develop and change, alongside the formation and strengthening of connections.
How it works
Neural activity can influence which connections remain. Molecular signals, developmental timing, and interactions between cells also matter. “Use it or lose it” captures only part of the process.
The role of glial cells
Microglia can engulf synaptic material. Astrocytes contribute through signaling and, in studied circuits, engulfment. These processes have been examined in particular circuits and models, often in animals.
Development and disease
Researchers study how pruning contributes to circuit development and how altered elimination may relate to neurological or psychiatric conditions. A finding in one circuit or model is not a universal explanation of a human disorder.
Why it matters
Brain development involves removing connections as well as adding them. Pruning is useful imagery, but it does not mean the brain always identifies and removes precisely the connections it no longer needs.