Fig. 3. Comparison of characteristics of the muscarinic motor patterns determined from 50 s stretches of activity. Depending on the mean bursting frequency, this observation period covered 26–57 cycles. Asterisks mark significant differences (sign-test: P<0.05; N=5). (A) Frequency of bursting. (B) Mean duty cycle (burst duration divided by cycle period). (C) Intra-burst frequency. (D) Number of units distinguishable in the extracellular recordings by visual inspection. cl, closer; op, opener; atr., atropine; oxo., oxotremorine; pilo., pilocarpine; scop., scopolamine. Values are mean + S.D.