Fig. 5.

Restoration of behavioral sensitization after regeneration of the S-cell axon. Mean percentage of initial contraction for leeches in experimental (lesion), sham (control) and habituation–control groups across habituation training 3–6 weeks after lesions. The performance of leeches in the experimental group is not different from that in the sham group. They show significant sensitization compared with the habituation–control group, which did not experience the sensitizing stimulus.