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Phase sensitivity in electroreception.

W Heiligenberg, R A Altes

Science (New York, N.Y.)

|March 3, 1978

Summary

Gymnotoid electric fish, Hypopomus artedi, can distinguish electric pulses based on phase, not just amplitude. This suggests their electroreception acts like a linear filter matched to their electric organ discharge.

Area of Science:

Neuroethology
Sensory Biology
Electrophysiology

Background:

Gymnotoid electric fish generate and sense electric fields for communication and navigation.
Previous research focused on amplitude discrimination in electric fish.
The role of spectral phase in electric fish electroreception remained unclear.

Purpose of the Study:

To investigate the role of spectral phase in electric stimulus discrimination by the gymnotoid electric fish Hypopomus artedi.
To determine if electroreception in H. artedi is based on a linear filtering mechanism.
To compare the properties of a matched filter to known electroreceptor responses.

Main Methods:

Behavioral experiments presenting electric stimulus pulses with identical spectral amplitudes but varying spectral phase functions.

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Analysis of behavioral responses to quantify discrimination abilities.

Modeling electroreception as a linear filter and comparing its impulse response to electroreceptor physiology.

Main Results:

Hypopomus artedi demonstrated significant discrimination between electric pulses solely based on differences in spectral phase.
Behavioral data were well-explained by a linear filter model.
The impulse response of the derived matched filter closely resembled the known impulse response of H. artedi electroreceptors.

Conclusions:

Electroreception in Hypopomus artedi is mediated by a linear filtering process.
Spectral phase information is crucial for electric signal discrimination in this species.
The electroreceptive system is finely tuned to the electric organ discharge of the species, acting as a matched filter.