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Related Experiment Videos

Auditory-evoked brainstem responses in the torpid deermouse

B Katbamna1, C Thodi, J B Senturia

  • 1Department of Speech and Hearing, Cleveland State University, OH 44115, USA.

Physiology & Behavior
|January 1, 1996
PubMed
Summary

Auditory-evoked brainstem responses (ABR) in deermice show altered neural activity during torpor. Full auditory function and brainstem response recovery occur during arousal from torpor.

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Area of Science:

  • Neuroscience
  • Physiology
  • Mammalian Biology

Background:

  • Torpor is a state of metabolic depression in endotherms.
  • Auditory-evoked brainstem responses (ABR) assess the integrity of the auditory pathway.
  • Deermice (Peromyscus maniculatus) are a model organism for studying torpor.

Purpose of the Study:

  • To investigate auditory-evoked brainstem responses (ABR) in deermice during torpor and arousal.
  • To understand changes in auditory pathway function during metabolic depression and recovery.

Main Methods:

  • Electrophysiological recordings of ABR in deermice.
  • Stimulation at varying click rates (slow and fast).
  • Comparison of ABR patterns during euthermia, torpor, and arousal.

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Main Results:

  • Euthermic deermice exhibited a standard five-wave ABR within 10 ms.
  • During torpor, ABR Wave I was elicited only at slow stimulation rates, indicating impaired neural processing.
  • Arousal was associated with the reappearance of all ABR components at both slow and fast rates.

Conclusions:

  • Auditory pathway function is significantly altered during torpor in deermice.
  • The recovery of ABR components during arousal signifies the restoration of auditory neural activity.
  • ABR can serve as a sensitive indicator of neural function during physiological transitions like torpor.