Scatter plots showing correlation between the side preferences of rotation and object location. Scatter plots with regression lines for molar-intact mice (control group) are shown in (A) and those for molarless mice (molarless group) are shown in (B). Filled triangles: 12 weeks of age (n = 15), open triangles: 24 weeks of age (n = 15), filled circles: 12 weeks of age (n = 13), open circles: 24 weeks of age (n = 6). Rotation preference = 100 × the number of turns to the right / the number of turns in both directions. Object preference = 100 × search time for object placed on the right / search time for both objects.