Figure 4.

Visual experience has no effect on the development of contextual modulation in the optic tectum. A, To alter the visual environment zebrafish were raised in complete darkness (DR, n = 5). B, Plot mean σ for each DR fish during the gray and textured blocks (p = 0.03, paired t test). C, A boxplot showing Δ σ between background for VE and DR fish (p = 0.1, t test). D, A plot of σ against neuron’s preferred stimulus location for each DR fish. A similar modulation zone to is present around 40° (p < 0.001, t tests, Bonferroni corrected), which is similar to fish raised with visual experience; *p < 0.05, ***p < 0.001, N.S = not significant (p > 0.05).