© Koninklijke Brill NV, Leiden, 2008 DOI: 10.1163/157075608X344622 Animal Biology 58 (2008) 301–312 www.brill.nl/ab Spontaneous ﬁ ring in primary aﬀ erent neurons of ampullary electroreceptor organs as attribute of bandwidth, threshold, and topology Robert C. Peters * , Franklin Bretschneider , Lonneke B. M. Eeuwes Functional Neurobiology, Utrecht University, Padualaan 8, 3584 CH Utrecht, Th e Netherlands Abstract Spontaneous ﬁ ring 1 of neurons plays an essential part in the detection of sensory stimuli. Spontaneous ﬁ ring of primary aﬀ erents of ampullary electroreceptor organs in the catﬁ sh Ameiurus nebulosus (Lesueur, 1819) was studied in relation to the distribution, thresholds, and frequency characteristics of the electroreceptor organs. Th e spontaneous ﬁ ring rate was correlated with the place on the skin. Th e mean inter-spike interval in 55 dorsal and 49 ventral ampullary organs in ﬁ ve specimens was 16.8 ms +/- 0.41 SEM and 20.5 ms +/- 0.48 SEM, corresponding to ﬁ ring rates of 59.5 and 48.7 s -1 respectively. Th e concomitant coeﬃ cients of variation were 0.33 and 0.29. Approximately half of the dorsal ampullae were innervated by two ﬁ bres. Th e ﬁ ring rates of each of the two ﬁ bres
Animal Biology – Brill
Published: Jan 1, 2008
Keywords: CARRIER FREQUENCY; SPONTANEOUS ACTIVITY; AMEIURUS NEBULOSUS; SENSITIVITY; PRIMARY AFFERENT FIBRES; GLUTAMATERGIC SYNAPSE; RESTING DISCHARGE; DETECTION THRESHOLD; ELECTRORECEPTION; BANDWIDTH
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