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Representative recordings of rhythmic activity during the test period. The patterned activity (•, pattern I; ○, other patterns) recorded from I2 n., R n.1, and n.2,1 in nondesheathed preparations during a 10 min test period in a control (A), a contingent-reinforcement (B), and a yoke-control (C) preparation. The frequency of patterned activity was enhanced after contingent reinforcement, as compared with the control and yoke-control preparations.
