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visual cortex
orientation selectivity
ocular dominance
activity maps
ferret
development
ocular dominance columns
cat striate cortex
off-center inputs
functional architecture
horizontal connections
ordered arrangement
intrinsic signals
neuronal-activity
receptive-fields
ferret
Neurosciences & Neurology
Abstract:
Recent experiments have studied the development of orientation selectivity in normal animals, visually deprived animals, and animals where patterns of neuronal activity have been altered. Results of these experiments indicate that orientation tuning appears very early in development, and that normal patterns of activity are necessary for its normal development. Visual experience is not needed for early development orientation, but is crucial for maintaining orientation selectivity. Neuronal activity and vision thus seem to play similar roles in the development of orientation selectivity as they do in the development of eye-specific segregation in the Visual system. (C) 1999 John Wiley &Sons. Inc.
