Interactions between segmental leg central pattern generators during fictive rhythms in the locust.

摘要: 1. Rhythmic activity of leg motor neurons could be evoked in isolated locust thoracic ganglia as well preparations two or three connected superfused with the muscarinic agonist pilocarpine. Rhythms were always more regular and reliably elicited single ganglia. When connected, rhythmic was not usually simultaneously all six hemiganglia. Typically, some hemiganglia rhythmically active, whereas others showed tonic highly irregular activity. 2. Action potentials from neuron pools recorded extracellularly nerves cross-correlated use standard algorithms. The following correlations observed between activities different hemisegments. 1) Within a segment, trochanteral levators coactive contralateral depressors. This correlation strong metathoracic ganglion, weaker pro- mesothoracic 2) Coupling on opposite sides same segment variable ganglia, because phase relationships each preparation also change during course an experiment. In never coactive. 3) Trochanteral often active within short latency levator bursts ipsilateral adjacent hemiganglion. addition, one inhibited segment. 4) strongly coupled to depressors, for 3. revealed by cross-correlation are discussed context what is known about mechanisms involved control intersegmental coupling legged locomotion.