Fig. 5. Comparison of characteristics of the nitrergic motor patterns determined from 50 s stretches of activity in five preparations before and after application of muscarinic antagonists. Depending on the mean bursting frequency, the observation period covered 31–55 cycles. (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; hydrox., hydroxylamine; scop., scopolamine; SNP, sodium nitroprusside. Values are mean + S.D.