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Circumesophageal interneurons required for reflexive and circadian locomotor behaviors in crayfish

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Summary

Surgical lesions were performed on the circumesophageal connectives of the crayfish,Procambarus clarkii, in an effort to localize further the interneuron tracts responsible for mediating a reflexive and a circadian locomotor behavior. Results (Table 1) indicate that these tracts are multiple within the cord and that they are redundant in this ability. All cord sectors except the dorso-medial quadrant appear to couple the two walking behaviors to their higher driver centers. Furthermore, in lesioned animals, both behaviors are lost or retained jointly, suggesting that the interneurons controlling them are either co-distributed within the connectives, or are in fact the same interneurons.

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Additional information

Research supported by NIH grant NS-05423 (JLL) by NIH Postdoctoral Fellowship NS00942 (WHG) and by NIH Training Grant 5T01 GM00836 (TLP)

The authors wish to acknowledge the technical assistance of Rowland Aertker, Joel Elliott, and Susan Abright. Thanks also to Ben Williams and John T. Smith for comments on the manuscript and discussions during the course of the work.

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Gordon, W.H., Larimer, J.L. & Page, T.L. Circumesophageal interneurons required for reflexive and circadian locomotor behaviors in crayfish. J. Comp. Physiol. 116, 227–238 (1977). https://doi.org/10.1007/BF00605404

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Keywords

  • Locomotor Behavior
  • Lesion Animal
  • Walking Behavior
  • High Driver
  • Driver Center