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Journal of comparative physiology

, Volume 145, Issue 3, pp 289–298 | Cite as

Electroreceptive representation and its dynamics in the cerebellum of the catfish,Ictalurus nebulosus (Ictaluridae, Siluriformes)

  • Shang-liang Tong
  • Theodore Holmes Bullock
Article

Summary

  1. 1.

    Extracellular unit spike responses have been recorded in the cerebellum of catfish during electroreceptive as well as several other kinds of stimulation.

     
  2. 2.

    Electric pulses in the water adequate to stimulate ampullary receptors activate some large cells of the cortex of the lobus caudalis pars lateralis and a few in the adjacent eminentia granularis and corpus cerebelli. These cells generally do not respond to vibration, sound, water movement, fin bending, or light, i.e., most are unimodal electrosense units, but some are moderately sensitive to drops of water falling on the water surface up to 15 cm away.

     
  3. 3.

    Some units have irregular background activity, others are regular and some are silent until stimulated. Presumably some are Purkinje cells and others are not; the latter may in part be equivalent to cells of cerebellar deep nuclei in amniotes.

     
  4. 4.

    Response characteristics are described, including the following: dipole axis and polarity discrimination, phasic, tonic and phasic-tonic units, and the effects of duration, intensity, pulse stimulus repetition, sine wave stimulus frequency, and movement of the stimulating current source on the response magnitude, form and latency. Low threshold cerebellar units respond to 0.4 μV/cm. In a small sample of units tested, tuning curves showed best frequencies between 2 and 8 Hz. Frequency following may extend only up to 8–15 Hz sine waves. The ON response can markedly alter the following of the first few cycles. Some units are responsive to a moving current source that is subthreshold when stationary.

     
  5. 5.

    Most units have a receptive field to a small (3 mm) dipole held close to the skin, of < 1/4 of the body length. The center of many receptive fields is excitatory when the current direction is inward; in other receptive fields, when it is outward. Many units have receptive fields on the ispsi-lateral side, some on both left and right sides. Of the latter some are symmetrical, others are asymmetrical either in position or in excitatory polarity.

     
  6. 6.

    Within the lobus caudalis pars lateralis, receptive fields classified as mainly on the head, on the body or on the tail are systematically distributed in a topographic map. The distribution of best dipole orientations appears random.

     

Keywords

Receptive Field Sine Wave Tuning Curve Cerebellar Deep Nucleus Dipole Axis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Andrianov GN, Ilyinsky OB (1973) Some functional properties of central neurons connected with the lateral-line organs of the catfish (Ictalurus nebulosus). J Comp Physiol 86:365–376Google Scholar
  2. Bastian J (1974) Electrosensory input to the corpus cerebelli of the high frequency electric fishEigenmannia virescens. J Comp Physiol 90:1–24Google Scholar
  3. Bastian J (1975) Receptive fields of cerebellar cells receiving exteroceptive input in a gymnotid fish. J Neurophysiol 38:285–300Google Scholar
  4. Bastian J (1976a) The range of electrolocation: a comparison of electroreceptor responses and the responses of cerebellar neurons in a gymnotid fish. J Comp Physiol 108:193–210Google Scholar
  5. Bastian J (1976b) Frequency response characteristics of electroreceptors in a weakly electric fish (Gymnotidae) with a pulse discharge. J Comp Physiol 112:165–180Google Scholar
  6. Bell CC (1979) Central nervous system physiology of electroreception, a review. J Physiol (Paris) 75:361–379Google Scholar
  7. Bell CC, Finger TE, Russell CJ (1981) Central connections of the posterior lateral line lobe in mormyrid fish. Exp Brain Res 42:9–22Google Scholar
  8. Bullock TH, Northcutt RG, Bodznick DA (1981) Evolution of electroreception. Trends Neuro Sci (in press)Google Scholar
  9. Finger TE (1978) Efferent neurons of the teleost cerebellum. Brain Res 153:608–614Google Scholar
  10. Heiligenberg W, Dye J (1981) Labelling of functionally identified neurons in electric fish by intracellular injection of HRP. Neurosci Abstr 7:844Google Scholar
  11. Knudsen EI (1976) Midbrain responses to electroreceptive input in catfish. J Comp Physiol 106:51–67Google Scholar
  12. Knudsen EI (1977) Distinct auditory and lateral line nuclei in the midbrain of catfishes. J Comp Neurol 173:417–432Google Scholar
  13. Knudsen EI (1978) Functional organization in electroreceptive midbrain of the catfish. J Neurophysiol 41:350–364Google Scholar
  14. Maler L, Karten HJ, Bennett MVL (1973) The central connections of the posterior lateral line nerve ofGnathonemus petersii. J Comp Neurol 151:57–66Google Scholar
  15. Maler L, Finger T, Karten HJ (1974) Differential projections of ordinary lateral line receptors and electroreceptors in the Gymnotid fish,Apteronotus (Sternarchus) albifrons. J Comp Neurol 158:363–382Google Scholar
  16. McCreery DB (1977a) Two types of electroreceptive lateral lemniscal neurons of the lateral line lobe of the catfishIctalurus nebulosus: Connections from the lateral line nerve and steadystate frequency response characteristics. J Comp Physiol 113:317–339Google Scholar
  17. McCreery DB (1977b) Spatial organization of receptive fields of lateral lemniscus neurons of the lateral line lobe of catfishIctalurus nebulosus. J Comp Physiol 113:341–353Google Scholar
  18. Nieuwenhuys R, Nicholson R (1969) Aspects of the histology of the cerebellum of mormyrid fishes. In: Llinás R (ed) Neurobiology of cerebellar evolution and development. American Medical Association, Chicago, pp 135–169Google Scholar
  19. Northcutt RG, Bodznick DA, Bullock TH (1980) Most non-teleost fishes have electroreception. Proc Int Union Physiol Sci 14:614Google Scholar
  20. Russell CJ, Bell CC (1978) Neuronal responses to electrosensory input in mormyrid valvula cerebelli. J Neurophysiol 41:149–151Google Scholar
  21. Szabo T (1970) A previously unknown function of so-called ampullary organ ofGnathonemus petersii. Z Vergl Physiol 66:164–175Google Scholar
  22. Tong SL (1982) The nucleus praeeminentialis: an electro- and mechanoreceptive center in the brainstem of the catfish. J Comp Physiol 145:299–309Google Scholar

Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Shang-liang Tong
    • 1
  • Theodore Holmes Bullock
    • 1
  1. 1.Neurobiology Unit, Scripps Institution of Oceanography and Department of Neurosciences, School of MedicineUniversity of CaliforniaSan Diego, La JollaUSA

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