PMID: 9437037Feb 14, 1998Paper

Neural substrates for species recognition in the time-coding electrosensory pathway of mormyrid electric fish

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
M A Friedman, Carl D Hopkins

Abstract

Mormyrid electric fish have species- and sex-typical electric organ discharges (EODs). One class of tuberous electroreceptors, the knollenorgans, plays a critical role in electric communication; one function is species recognition of EOD waveforms. In this paper, we describe cell types in the knollenorgan central pathway, which appear responsible for analysis of the temporal patterns of spikes encoded by the knollenorgans in response to EOD stimuli. Secondary sensory neurons in the nucleus of the electrosensory lateral line lobe (NELL) act as relays of peripheral responses. They fire a single phase-locked spike to an outside positive-going voltage step. Axons from the NELL project to the toral nucleus exterolateralis pars anterior (ELa). Immediately after they enter the ELa, they send collaterals to terminate on one to three ELa large cells and then continue in a lengthy neuronal pathway that traverses the ELa several times. After a path length of up to 5 mm, the NELL axon terminates on as many as 70 ELa small cells. Thus the large cells appear to be excited first, followed by the small cells, with the intervening length of the axon serving as a delay line. The large cells also respond with phase-locked spikes to voltage steps....Continue Reading

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