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Pollimyrus adspersus discriminates the individuallyvariable waveforms of Electric Organ Discharges (EODs) of conspecifics of only 150–250 ms duration. We examined: (1) the discrimination threshold for artificially generated EODs of similar waveform, (2) the mechanism of signal analysis (spectral vs temporal) present, by determining the discrimination between different waveforms of identical amplitude spectra, and (3) the threshold field intensity and reach of discrimination. The triphasicP. adspersus EOD waveform was artificially generated bysuperimposing two Gaussians, one wide, the second narrow, inverted, and of threefold amplitude. The naturalvariability among individual EOD waveforms was simulatedby phase-shifting one Gaussian relative to the other. The symmetrical waveform where the peaks of the two Gaussians coincided was used as a reference (phase shift=0, rewarded stimulus S+). Results were: (1) in foodrewarded conditioning experiments, trained fish (N=7) detected a phase-shift in artificial EOD stimuli as low as 2 ms (N=2 fish), 6 ms (N=1) and 10 ms (N=1). (2) All fish tested (N=3) discriminated between artificial EODs of identical amplitude spectra but different waveforms (hence, different phase spectra), demonstrating a temporalmechanism of signal analysis. (3) The maximum reach ofwaveform discrimination was 130 cm at 4.9 mVp-p/cm and100 mS/cm water conductivity (test signal generated atnatural amplitude), that is, similar to the reach of EODdetection. Therefore, among the three kinds of electroreceptor organ present in mormyrids, we consider Knollenorgane the relevant sensory organs for EOD waveformdiscrimination

Electrosensory basis for individual recognition in a weakly electric, mormyrid fish, Pollimyrus adspersus (G�nther, 1866)