Research overview: critical periods in the developing feline visual cortex

The kitten visual cortex has a critical period during which experience strongly shapes its wiring, a concept established largely through feline research. This overview surveys the idea of the critical period, a window in early life when visual input must be normal for the cortex to develop typical connectivity, and when deprivation or imbalance produces lasting deficits. Classic experiments showed that depriving an eye during this window shifts cortical dominance toward the other eye, demonstrating experience-dependent plasticity. The survey relates the critical period to the maturation of vision and to its broad influence on neuroscience and on understanding human conditions like amblyopia. It discusses how the window closes as the system stabilizes. Understanding the critical period shows that the kitten brain is sculpted by what it sees during a sensitive phase. It frames visual development as a collaboration between genetic programs and early experience, with cats serving as the model that revealed this principle.