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Spatial release from masking in a free-field source identification task by gray treefrogs.

Vivek Nityananda1, Mark A Bee

  • 1Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, 100 Ecology, 1987 Upper Buford Circle, St. Paul, MN 55108, USA. v.nityananda@qmul.ac.uk

Hearing Research
|January 14, 2012
PubMed
Summary

Frogs can better hear mating calls in noisy environments when sounds come from different directions. This spatial release from masking helps females find males in loud frog choruses.

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Area of Science:

  • Bioacoustics
  • Animal Communication
  • Auditory Neuroscience

Background:

  • Acoustic communication in noisy social groups is challenging due to masking of important signals by background noise.
  • Spatial release from masking (SRM) allows humans to better hear speech when sound sources are spatially separated.
  • Female frogs must detect and localize male calls amidst the noise of breeding choruses for successful reproduction.

Purpose of the Study:

  • To investigate spatial release from masking (SRM) in Cope's gray treefrog (Hyla chrysoscelis) during a call recognition task.
  • To determine if spatial separation of sound sources improves female frogs' ability to detect male advertisement calls in noise.

Main Methods:

  • Used no-choice phonotaxis assays to measure female frog signal recognition thresholds.

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  • Presented target advertisement calls with and without chorus-shaped noise.
  • Varied the spatial position of the noise masker relative to the target call (co-localized vs. 90° azimuth separation).

    • Main Results:

    • Female frogs showed approximately 3 dB of masking release when the noise masker was spatially separated (90° azimuth) from the target call.
    • The magnitude of masking release was consistent across different spectral compositions of the target call.
    • This indicates a modest spatial unmasking effect in free-field call recognition for this species.

    Conclusions:

    • Frogs experience spatial unmasking, similar to humans, aiding auditory perception in noisy social environments.
    • The findings suggest that spatial cues are important for female frogs to locate conspecific males in breeding choruses.
    • Signal spectral content appears to have minimal impact on both source identification and the degree of spatial unmasking in this species.