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Contact: Diana Lutz
Washington University in St. Louis

Comparison of Discharges Among Fishes With and Without the Evolved Brain

Caption: In the top group of fishes, species in the genus Paramoryrops that has the complex signal-processing brain, discharges have changed quickly, resulting in dramatically different pulses among closely related species. In the bottom group of fishes, species in the genus Petrocephalus whose midbrain is more simply structured, all of the species have similar pulses. The difference arises because the top group has the anatomical features needed to exploit the signal space -- such as the anatomy needed to make different pulses and the sensory and analytical ability to perceive small differences in pulse shape.

Credit: Sebastien Lavoue, Carl Hopkins, John Sullivan and Matthew Arnegard

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