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Visual responses before eye opening are large, of long duration, and oscillatory. A, Representative mean flash-evoked L4 LFP at each age. Red line shows time of 100 ms flash onset. No responses were observed before P8. Scale bar, 100 μV, 500 ms. B, Representative poststimulus time histogram for L4 MUA from the same animal. Scale bar, 100 spikes/s. C, Representative poststimulus increase in spectral power for L4 LFP for the same animal. Color map depicts fold increase over baseline.
