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Sex-specific speed-accuracy tradeoffs shape neural processing of acoustic signals in a grasshopper

View ORCID ProfileJan Clemens, View ORCID ProfileBernhard Ronacher, View ORCID ProfileMichael S. Reichert
doi: https://doi.org/10.1101/2020.07.20.212431
Jan Clemens
1European Neuroscience Institute Göttingen – A Joint Initiative of the University Medical Center Göttingen and the Max-Planck Society, Grisebachstrasse 5, Göttingen, 37077, Germany
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  • For correspondence: clemensjan@gmail.com
Bernhard Ronacher
2Behavioral Physiology Group, Department of Biology, Humboldt-Universität zu Berlin, Germany
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Michael S. Reichert
3Department of Integrative Biology, Oklahoma State University, Stillwater OK USA
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Abstract

Speed-accuracy tradeoffs – being fast at the risk of being wrong – are fundamental to many decisions and natural selection is expected to resolve these tradeoffs according to the costs and benefits of behavior. We here test the prediction that females and males should integrate information from courtship signals differently because they experience different payoffs along the speed-accuracy continuum. We fitted a neural model of decision making (a drift-diffusion model of integration to threshold) to behavioral data from the grasshopper Chorthippus biguttulus to determine the parameters of temporal integration of acoustic directional information used by male grasshoppers to locate receptive females. The model revealed that males had a low threshold for initiating a turning response, yet a large integration time constant enabled them to continue to gather information when cues were weak. This contrasts with parameters estimated for females of the same species when evaluating potential mates, in which response thresholds were much higher and behavior was strongly influenced by unattractive stimuli. Our results reveal differences in neural integration consistent with the sex-specific costs of mate search: Males often face competition and need to be fast, while females often pay high error costs and need to be deliberate.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Funding: JC: DFG CL 596/1-1 (32951824), SPP 2205 (430158535)

    BR: DFG Ro 547/12-1

    MR: US National Science Foundation International Research Fellowship Program (IRFP 1158968)

  • https://doi.org/10.5061/dryad.05qfttf28

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted January 20, 2021.
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Sex-specific speed-accuracy tradeoffs shape neural processing of acoustic signals in a grasshopper
Jan Clemens, Bernhard Ronacher, Michael S. Reichert
bioRxiv 2020.07.20.212431; doi: https://doi.org/10.1101/2020.07.20.212431
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Sex-specific speed-accuracy tradeoffs shape neural processing of acoustic signals in a grasshopper
Jan Clemens, Bernhard Ronacher, Michael S. Reichert
bioRxiv 2020.07.20.212431; doi: https://doi.org/10.1101/2020.07.20.212431

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