Fig. 4

Mobility of mice exposed to 420nm light and their controls at 4 (A-F) and 8 weeks (G-L). After 4 weeks of exposure there was no difference in the total distance travelled between experimental and control mice (A). But there were differences in the distance travelled in central and peripheral regions of the open field with significant reductions in time and distance travelled in the centre in favour of the periphery (B, C, D and F). This is clearly shown in the open field map (F). Overall results are similar at 8 weeks (G, H, I, J, K and L). However, some data sets did not reach statistical significance although their trend was clear (G, J and K). Again, differential patterns are clear in the open field map (L). Error bars are SEM. Statistical abbreviation * = P<0.05, ns = not significant