As a final measure of anxiety levels in HttQ111/+ mice, we also employed the light/dark exploration task 32, 33, finding that Htt+/+ and HttQ111/+ mice spend the same amount of time in the light and dark halves of the apparatus (Fig. 6e; t(38) = 0.04, p = 0.9) and enter the light compartment of the maze a similar number of times (t(38) = −0.6, p = 0.5). This evidence concerns the gene HTT and Anxiety.