Figure 1.

Protocol for sensitization training. A, All training stimuli were delivered on a randomly chosen side of the lateral body wall. Testing stimuli were delivered on the ipsilateral and contralateral sides of the tail, at an area different from the one where training stimuli were delivered. B, Four-day training for LTS started immediately after a session of baseline behavioral testing. Twenty-four hours after the end of training, an identical behavioral testing session was used to assess LTS on the ipsilateral side of trained animals versus the contralateral side of trained animals or the untrained animals.