Temporal filtering properties of ampullary electrosensory neurons in the torus semicircularis of Eigenmannia: evolutionary and computational implications

Brain, Behavior and Evolution
Eric S Fortune, G J Rose

Abstract

Weakly electric fish have parallel electrosensory systems, the phylogenetically older ampullary system and the novel tuberous system. The tuberous system is an adaptation related to the evolution of active electrolocation. To examine the evolutionary relationship of the ampullary and tuberous systems, the temporal filtering properties of ampullary neurons in the dorsal torus semicircularis of Eigenmannia were studied. 'Whole-cell' recordings were made in vivo using patch-type pipettes. The responses of 19 neurons to sinusoidal electric signals (< 40 Hz) were recorded and the anatomy of these neurons demonstrated by injection of biocytin. All eight low-pass ampullary neurons had broad, relatively smooth post-synaptic potentials (psps) that at low frequencies nicely reflected the sinusoidal stimuli. These neurons had somata of 10-14 microns diameter and thick, spiny dendrites. Eight high-pass neurons were recorded, representing three physiological classes. The first class (3 neurons) had psps that roughly followed the sinusoidal time course of the stimulus; the psp morphology was similar to low-pass neurons. The second class had many small, fast, individual psps; their rate of occurrence varied with the stimulus. Finally, four ne...Continue Reading

Citations

Jul 8, 2005·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·John U RamcharitarEric S Fortune
Nov 6, 2008·Journal of Physiology, Paris·B P ChagnaudM H Hofmann
Mar 22, 2012·The Journal of Comparative Neurology·Ana C C GiassiLeonard Maler
Feb 20, 2008·PLoS Computational Biology·Sean CarverEric S Fortune
Mar 20, 2010·Neuroscience·O Avila-AkerbergM J Chacron
Oct 11, 2007·Progress in Brain Research·Leonard Maler
Oct 6, 2005·Physical Biology·Michael H Hofmann, Lon A Wilkens
Jun 23, 2006·Journal of Neurophysiology·J U RamcharitarE S Fortune
Dec 1, 1998·Evolution; International Journal of Organic Evolution·James S AlbertTamaki Yuri
Aug 1, 2020·Frontiers in Integrative Neuroscience·Mariana M Marquez, Maurice J Chacron
Sep 24, 2011·Journal of Neurophysiology·Katrin Vonderschen, Maurice J Chacron
Jun 14, 2013·The Journal of Experimental Biology·Christa A BakerBruce A Carlson
Nov 8, 2005·The Journal of Experimental Biology·Michael H HofmannLon A Wilkens
Apr 13, 2012·The Journal of Experimental Biology·Sarah A StamperEric S Fortune

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