Dendritic complexity is reduced in trained animals. A–D, Branch points are reduced in trained animals in both hemispheres (A, B) with no difference between regions [dorsomedial (DM) vs dorsolateral (DL), p > 0.05], and in both subregions (C, D) with no difference between hemispheres (ipsilateral vs contralateral, p > 0.05). E–H, Dendritic length is reduced in trained animals in both hemispheres (E, F) with no difference between regions (DM vs DL, p > 0.05), and in both subregions (G, H) with no difference between hemispheres dorsomedially (ipsilateral vs contralateral, p > 0.05), but a significant difference between hemispheres dorsolaterally (ipsilateral reduction > contralateral reduction, *p = 0.0336). ns, Not significant.