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Neurophysiological coordination of duet singing.

Melissa J Coleman1, Nancy F Day2, Pamela Rivera-Parra3

  • 1W. M. Keck Science Department, Scripps College, Pitzer College, and Claremont McKenna College, Claremont, CA 91711; mcoleman@kecksci.claremont.edu.

Proceedings of the National Academy of Sciences of the United States of America
|June 2, 2021
PubMed
Summary

Plain-tailed wrens coordinate duets using acoustic feedback. Hearing their partner inhibits brain activity in the HVC region, suggesting neural inhibition helps synchronize singing.

Keywords:
closed-loop controlcooperationreciprocal inhibitionsensorimotor integrationturn taking

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Area of Science:

  • Neuroethology
  • Behavioral Neuroscience
  • Bioacoustics

Background:

  • Cooperative behaviors often depend on sensory cues for coordination.
  • The neurophysiological basis of inter-individual motor coordination via sensory feedback is poorly understood.

Purpose of the Study:

  • To investigate how acoustic feedback influences neurophysiological responses in the HVC (a song control area) for coordinating duet singing in plain-tailed wrens (Pheugopedius euophrys).
  • To explore the role of neural inhibition in mediating rapid turn-taking during avian duets.

Main Methods:

  • Simultaneous neurophysiological recordings of HVC neuronal activity in pairs of singing wrens.
  • Analysis of HVC spiking activity in response to self-produced and partner-produced vocalizations.
  • Investigation of the role of GABAergic transmission using urethane anesthesia.

Main Results:

  • HVC neuronal activity increased during self-produced syllable singing in both sexes.
  • Auditory feedback from a singing partner decreased HVC activity during duets, suggesting coordination via inhibition.
  • GABAergic antagonism with urethane led to HVC excitation, implicating GABA in inhibitory coordination.

Conclusions:

  • The HVC region integrates auditory information across singing partners during duets.
  • Rapid turn-taking in wren duets may be facilitated by inhibitory mechanisms within the HVC.
  • Acoustic feedback and neural inhibition play critical roles in coordinating complex vocal interactions.