Electric Organ Discharge
In the laboratory, EODs of G. petersii are often sexually dimorphic, with the male EOD longer in duration than that of the female. The EOD has three phases: an initial head negative phase which is visible only after amplifying the vertical axis of the display, followed by a head-positive then head-negative phase. The duration of the EOD is approximately 300 to 500 µs. The presence of an initial head-negative phase to the waveform is characteristic of an electric organ with electrocytes which have penetrating stalks.
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