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Titolo:
WAVE-FORM TUNING OF ELECTRORECEPTOR CELLS IN THE WEAKLY ELECTRIC FISH, GNATHONEMUS-PETERSII
Autore:
VONDEREMDE G; BLECKMANN H;
Indirizzi:
UNIV BONN,INST ZOOL,POPPELSDORFER SCHLOSS D-53115 BONN GERMANY
Titolo Testata:
Journal of comparative physiology. A, Sensory, neural, and behavioral physiology
fascicolo: 5, volume: 181, anno: 1997,
pagine: 511 - 524
SICI:
0340-7594(1997)181:5<511:WTOECI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
AFFERENT-FIBERS; CAPACITIVE OBJECTS; PHASE SENSITIVITY; MORMYRID FISH; ELECTROLOCATION; DISCRIMINATION; EIGENMANNIA; ORGANS;
Keywords:
ELECTRORECEPTION; MORMYROMAST; KNOLLENORGAN; PHASE-SHIFT; TIME CODING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
G. Vonderemde e H. Bleckmann, "WAVE-FORM TUNING OF ELECTRORECEPTOR CELLS IN THE WEAKLY ELECTRIC FISH, GNATHONEMUS-PETERSII", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 181(5), 1997, pp. 511-524

Abstract

Electroreceptive afferents from A- and B-electroreceptor cells of mormyromasts and Knollenorgans were tested for their sensitivity to different stimulus waveforms in the weakly electric fish Gnathonemus petersii . Both A- and B-mormyromast cells had their lowest sensitivity to awaveform similar to the self-generated electric organ discharge (EOD)(around 0 degrees phase-shift). Highest sensitivities, i.e. lowest response thresholds, in both A- and B-cells were measured at phase shifts of + 135 degrees. Thus, both cell types were inversely waveform tuned. The sensitivity of B-cells increased sharply with increasing waveform distortions. Their tuning curves had a sharp minimum of sensitivityat + 7 degrees phase shift. A-cells had a much broader waveform tuning with a plateau level of low sensitivity from + 24 degrees to -15 degrees. Across a 360 degrees cycle of phase-shifts, the range of thresholds was 16 dB for individual B-cells and 4.5 dB for individual A-cells. Knollenorgan afferents were tuned to 0 degrees phase-shifted EODs and had a dynamic range of 12 dB. Lowest sensitivities were measured at a phase shift of + 165 degrees. Experiments with computer-generated stimuli revealed that the strong sensitivity of mormyromast B-cells of EOD waveform distortions cannot be attributed to any of the seven waveform parameters tested. In addition, EOD stimuli must have the correct duration for B-cells to respond to waveform distortions. Thus, waveform tuning appears to be based on the specific combination of several waveform parameters that occur only with natural EODs.

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Documento generato il 24/09/20 alle ore 07:48:30