Synaptic plasticity

The ability of synapses to strengthen, weaken, or reorganize their connections over time in response to activity and experience. This fundamental property of the brain underlies Learning, memory formation, and neural adaptation throughout Life.

When neurons fire together repeatedly, their connection may strengthen—a phenomenon captured by the phrase "neurons that fire together wire together." Conversely, unused connections can fade. These changes occur through multiple mechanisms: chemical modifications at the synapse, receptor density shifts, and structural remodeling of Dendrites. Neurotransmitters and molecular signaling cascades like calcium/calmodulin-dependent protein kinase drive these transformations.

Synaptic plasticity operates across timescales from milliseconds to years. Short-term plasticity enables rapid integration of signals; long-term forms like Long-term potentiation and Long-term depression create lasting memories. This variability allows a fixed brain structure to encode vast experiences—making plasticity crucial for development, skill acquisition, and recovery from neural injury.

The phenomenon reveals how Genes and experience interact to sculpt behavior and cognition, bridging biology and psychology.

Related

Long-term potentiation, Memory consolidation, Neurotransmitters, Brain development, Learning, Neural networks