VONDEREMDE, G and BLECKMANN, H (1992) DIFFERENTIAL RESPONSES OF 2 TYPES OF ELECTRORECEPTIVE AFFERENTS TO SIGNAL DISTORTIONS MAY PERMIT CAPACITANCE MEASUREMENT IN A WEAKLY ELECTRIC FISH, GNATHONEMUS-PETERSII. JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY, 171 (5). pp. 683-694. ISSN 0340-7594,
Full text not available from this repository.Abstract
Gnathonemus petersii discriminates between ohmic and capacitive objects. To investigate the sensory basis of this discrimination we recorded from primary afferents that innervate either A or B mormyromast sensory cells. Modified and natural electric organ discharges were used as stimuli. In both A and B fibres frequencies below the peak-power frequency (3.8 to 4.5 kHz) of the electric organ discharge caused minimal first-spike latencies and a maximum number of spikes. A fibres did not discriminate phase-shifted stimuli, whereas B fibres responded significantly with a decrease in first-spike latency if the phase shift was only -1-degrees. In both A and B fibres an amplitude increase caused a decrease in spike latency and an increase in spike number; an amplitude decrease had the reverse effect. If stimulated with quasi-natural electric organ discharges distorted by capacitive objects, the responses of A fibres decreased with increasing signal distortion. In contrast, the responses of B fibres increased until amplitude effects began to dominate. Gnathonemus may use the physiological differences between A and B fibres to detect and discriminate between capacitive and purely ohmic objects.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MORMYRID FISH; FIBERS; EIGENMANNIA; ELECTROLOCATION; DISCRIMINATION; SENSITIVITY; RECOGNITION; OBJECTS; ORGANS; WEAKLY ELECTRIC FISH; ELECTROLOCATION; COMPLEX IMPEDANCE; OBJECT DISCRIMINATION; SENSORY PHYSIOLOGY |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54267 |
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