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Speech sound discrimination by Mongolian gerbils.

Carolin Jüchter1, Rainer Beutelmann1, Georg Martin Klump1

  • 1Cluster of Excellence Hearing4all, Division Animal Physiology and Behavior, Department of Neuroscience, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, Oldenburg 26129, Germany.

Hearing Research
|March 11, 2022
PubMed
Summary

The Mongolian gerbil can perceive human speech sounds, similar to humans. This finding establishes the gerbil as a valuable animal model for studying speech perception and auditory processing.

Keywords:
BehaviorMongolian gerbilPerceptual mapPsychoacousticsSpeech perceptionSpeech sound discrimination

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Area of Science:

  • Auditory Neuroscience
  • Animal Models
  • Speech Perception

Background:

  • Human speech sound perception is complex.
  • Investigating speech perception in animal models offers insights into fundamental auditory processing mechanisms.
  • The Mongolian gerbil (Meriones unguiculatus) has not been previously established as a model for speech sound discrimination.

Purpose of the Study:

  • To establish the Mongolian gerbil as a model for investigating human speech sound perception.
  • To analyze gerbils' ability to discriminate consonant-vowel-consonant (CVC) and vowel-consonant-vowel (VCV) logatomes.
  • To compare gerbil speech sound perception with human perception.

Main Methods:

  • Four gerbils were trained on an oddball target detection paradigm to discriminate logatomes.
  • Experiments utilized an ICRA-1 noise masker and presented logatomes from multiple speakers at various signal-to-noise ratios.
  • Response latencies were measured to create perceptual maps using multidimensional scaling.

Main Results:

  • Gerbils successfully discriminated between different CVC and VCV logatomes.
  • Perceptual maps revealed that gerbils' representation of vowels and consonants closely resembles that of humans.
  • Gerbils required higher signal-to-noise ratios than humans for accurate speech sound discrimination.

Conclusions:

  • The Mongolian gerbil demonstrates a capacity for discriminating human speech sounds, with perception based on formant frequencies for vowels and articulatory features for consonants.
  • The gerbil's perceptual similarities to humans, despite requiring higher signal-to-noise ratios, validate its use as a model for human speech sound discrimination research.
  • This study provides a foundation for using gerbils to explore the neurobiological basis of speech perception.