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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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Midbrain node for context-specific vocalisation in fish.

Eric R Schuppe1,2, Irene Ballagh1,3, Najva Akbari4,5

  • 1Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, 14853, USA.

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|January 3, 2024
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Summary
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The periaqueductal gray (PAG) in fish brains shows distinct neural patterns for different vocalizations, similar to mammals. This suggests shared brain mechanisms control vocal communication across diverse species.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Bioacoustics

Background:

  • Vocalizations convey crucial information about behavioral states in various social contexts.
  • The neural mechanisms underlying the acoustic patterning of context-specific vocal signals are not well understood.
  • The periaqueductal gray (PAG) is a key brain region for vocalization initiation in mammals.

Purpose of the Study:

  • To investigate the role of the PAG in patterning vocalizations in a highly vocal fish species.
  • To explore functional similarities in vocal control between fish and mammals.

Main Methods:

  • Recorded neural activity in the PAG of Porichthys notatus during different behaviors (agonistic, courtship, foraging).
  • Used pharmacological manipulations in the PAG and hindbrain to assess their effects on vocal output.
  • Analyzed the temporal features of vocalizations and neural activation patterns.

Main Results:

  • PAG neurons exhibited distinct activation patterns during agonistic and courtship calls, with minimal overlap during foraging.
  • Pharmacological interventions in the PAG, but not the hindbrain, modulated vocal network output to sonic muscles.
  • The temporal characteristics of courtship and agonistic calls were replicated by these manipulations, indicating the necessity of balanced neural dynamics.

Conclusions:

  • The findings support the hypothesis of conserved functional PAG nodes in vocal communication across fish and mammals.
  • The PAG plays a role in shaping the acoustic structure of social context-specific vocal signals in fish.
  • Neural circuits within the PAG are critical for generating diverse vocalizations based on behavioral context.