Metal and plastic objects moved near to the animal's (Apteronotus albifrons) body (5 mm lateral) evoke changes in receptor activity consisting primarily of increases in the case of metal and decreases due to plastic. No receptors showed similar responses to both types of objects (Fig. 1).
Objects moved parallel to the long axis of the fish at sequentially greater distances evoked responses which decayed as a power function of distance. The exponents describing this response fall-off ranged from −1.1 to −2.5 and are in good agreement with calculated changes in trans-epidermal voltage due to the presence of objects at increasing distances from the fish.
Increasing or decreasing object size did not markedly alter the rate of response decay but shifted the response-distance relationship so that larger or smaller responses occurred at a given distance.
Responses of cerebellar cells to moving objects were more complex than those of the single receptors, they usually consisted of both increases and decreases in spike frequency as objects passed through a cell's receptive field. Although a given cell usually gave different responses to plastic and metal objects no predictable response (i.e. increase or decrease in spike frequency) was associated with object quality. Most cerebellar cells showed responses dependent on the direction of object movement (Fig. 6).
Responses of some cerebellar cells decayed in a fashion similar to responses of single receptors as objects moved at sequentially greater distances. Others showed constant response amplitude out to a distance of about 25mm. The responses of this later cell type were also independent of object size (Fig. 8).
The population of cerebellar cells studied could not be divided into discreet categories according to the characteristics of response fall-off. Instead they seem to be distributed along a continuum, varying degrees of constant response at increasing distance being present in different cells (Fig. 9B).
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Similar content being viewed by others Explore related subjectsDiscover the latest articles and news from researchers in related subjects, suggested using machine learning. ReferencesBastian, J.: Receptive fields of cerebellar cells receiving exteroceptive input in a gymnotid fish. J. Neurophysiol.38, 285–300 (1975)
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Department of Neurosciences, School of Medicine and Neurobiology Unit, Scripps Institute of Oceanography, University of California, San Diego, La Jolla
Joseph Bastian
The author gratefully acknowledges the many helpful suggestions of Professor T.H. Bullock and the valuable technical assistance of the staff of Dr. Bullock's laboratory. I thank Drs. W. Heiligenberg and K. Behrend for critically reading the manuscript and Ms. Adele Moreland for assistance in data analysis and manuscript preparation. Supported by NSF and NIH Grants to Dr. Bullock and in part by NIH grant 1-RO1 NS 12337-01.
About this article Cite this articleBastian, J. The range of electrolocation: A comparison of electroreceptor responses and the responses of cerebellar neurons in a gymnotid fish. J. Comp. Physiol. 108, 193–210 (1976). https://doi.org/10.1007/BF02169048
Received: 10 December 1975
Issue Date: June 1976
DOI: https://doi.org/10.1007/BF02169048
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