Extended Data Fig. 4: The spatial modulation of V1 responses is not due to end-of-corridor visual cues.

a, Diagram of the 200-cm virtual corridor, containing the same grating and plaid as the regular corridor, repeated four times instead of twice. b, Visual scenes from locations within the first 100 cm of the extended corridor, separated by 40 cm, are visually (pixel-to-pixel) identical. c, Cumulative distribution of the spatial modulation ratio across the two mice that were placed in the long corridor (7 sessions, 2 mice; median ± m.a.d: 0.62 ± 0.26; 1,044 neurons, black line). Grey line shows the spatial modulation ratio predicted by the non-spatial model (which predicts activity from the visual scene, trial onset and offset, speed, reward, pupil size and displacement from the central position of the eye; see Extended Data Fig. 7, non-spatial model). The two distributions are significantly different (two-sided Wilcoxon rank sum test; P < 10⁻¹⁴).