Similar to color/luminance recognition, mice trained to distinguish the moving direction of moving bars also improved their performance over the course of training. The mice reduced the average time required for reaching each reward from 98.93±4.7 sec in the Baseline phase to 78.40±4.5 sec in the Data Acquisition phase. A paired Student t-test shows that the difference between these two groups is statistically significant (df = 37, t = 3.13, P<0.01) (Fig 4F). However, the average distance required reaching each reward did not change significantly (Fig 4E, paired Student t-test, df = 37 t = 1.28, P>0.05).