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Fig. 9. Examples of Knollenorgan responses to natural EOD stimuli. Results are
shown for electroreceptors with relatively low best frequencies in the type I
morph (A; specimen 4) and the type II morph (B; specimen 2), as well as
electroreceptors tuned to higher frequencies in the type I morph (C; a
different unit in specimen 4) and the type II morph (D; specimen 5). Stimuli
(red) are plotted on the same time axis as compound PST histograms of
spike-like receptor potentials (black). In each sub-plot, the upward histogram
gives responses to the EOD polarity shown, whereas the inverted stimulus was
used to generate each downward histogram. Within each panel (A-D), the same
stimulus waveforms are aligned vertically and are shown from lower (top) to
higher (bottom) stimulus amplitudes (dB indicated). Identical stimulus
waveforms (played to each morph) are shown in A,B, and a different set of
identical waveforms is shown in C,D. The type II stimulus for A,B is a
female-like EOD recorded from the Ivindo River. The type II stimulus for C,D
is an EOD recorded from a Mouvanga Creek male exhibiting a slight degree of
waveform elongation. All type III stimuli are the same EOD of an Okano River
adult (sex and breeding status undetermined). Type I stimuli are female-like
EODs (recorded from different individuals in A,B versus C,D).
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