Frank Sengpiel is at the School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3US, UK. sengpielf@cardiff.ac.uk
Visual cortex neurons are arranged into maps according to their response selectivity. Ocular dominance and orientation selectivity maps can develop without visual experience. Unexpectedly, the direction selectivity map requires visual input during a critical period, as later visual experience cannot rescue the direction selectivity map in dark-reared ferrets.
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