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Influence of Direct Current Stimulation On the Ion-Induced Sensitivity Changes of the Electroreceptors (Small Pit Organs) of the Brown Bullhead, Ictalurus Nebulosus LeS

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

1) The a.c. sensitivity of the electroreceptors of the brown bullhead, Ictalurus nebulosus LeS., could be controlled by applying direct current stimuli with current densities of 2 × 10-7 to 2 × 10-5 A/cm2. 2) These effects bear a tonic character and may last up to 15 minutes. 3) Increases or decreases in the electroreceptor's sensitivity caused by alterations in the ionic contents of the animals environment, could also be compensated by applying direct current stimuli. 4) The implantation of electrodes in intact animals was strongly improved by the use of cocoa butter for electrical insulation and mechanical fixation. 5) Implications of the voltage controlled sensitivity of the electroreceptors are discussed.

Affiliations: 1: Laboratory of Comparative Physiology, University of Utrecht, The Netherlands


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