Moult, P. R., Cottrell, G. A., & Li, W.-C.
School of Biology, University of St. Andrews, Bute Building, St. Andrews KY16 9TS, UK, School of Psychology and Neuroscience, University of St. Andrews, Bute Building, St. Andrews KY16 9TS, UK.
Alternating contractions of antagonistic muscle groups during locomotion are generated by spinal "half-centre" networks coupled in antiphase by reciprocal inhibition. It is widely thought that reciprocal inhibition only coordinates the activity of these muscles. We have devised two methods to rapidly and selectively silence neurons on just one side of Xenopus tadpole spinal cord and hindbrain, which generate swimming rhythms. Silencing activity on one side led to rapid cessation of activity on the other side. Analyses reveal that this resulted from the depression of reciprocal inhibition connecting the two sides. Although critical neurons in intact tadpoles are capable of pacemaker firing individually, an effect that could support motor rhythms without inhibition, the swimming network itself requires ~23 min to regain rhythmic activity after blocking inhibition pharmacologically, implying some homeostatic changes. We conclude therefore that reciprocal inhibition is critical for the generation of normal locomotors rhythm.
… “Yellow light for ArCh activation and blue light for GFP observation from LED arrays (pE-1, CoolLED) were controlled by Power 1401 mkII using Signal software.”…
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pE-2: A repeatable, controllable modular system with 20 different LED peaks. Instant on/off and intensity (0-100%) control.
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