Figure 1.

MWM performance of female grass rats housed in either brLD or dimLD conditions over 4 weeks. (A) Latency of the animals to find the platform in trial 1 (24-hour delay) over the course of 5 training days. Animals housed in brLD located the platform significantly faster than the animals housed in dimLD (main effect of training days: F(4,56)= 8.332, p < 0.001; main effect of lighting condition: F(1,14)= 7.657, p<0.05); interaction between lighting condition and training days (F(4,56)= 7.830, p<0.001). (B) Latency of the animals to find the platform in trial 2 (30-second delay) over the course of 5 training days. Both groups expressed improvement over the training days (F(4,28)=14.361, p<0.001) with no significant differences between the groups or interactions between training days and light condition. (C) Representative track plots of the search patterns used by brLD and dimLD animals during the probe trial (goal quadrant in red). (D) Grass rats in the dimLD condition spent significantly less time in the goal quadrant compared to grass rats in the brLD condition; horizontal line at 15 seconds indicates chance level performance. Date are shown as mean ± sem. *, p < 0.05