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Conditioned enhancement and suppression in the developing auditory midbrain.

S K Thornton1, M N Semple, D H Sanes

  • 1Center for Neural Science, New York University, New York 10003, USA.

The European Journal of Neuroscience
|April 2, 1999
PubMed
Summary
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Juvenile gerbils show less pronounced neural responses to sound localization cues compared to adults. This difference in auditory processing may impact young animals' ability to accurately pinpoint sound sources.

Area of Science:

  • Neuroscience
  • Auditory System Development
  • Computational Neuroscience

Background:

  • The adult central auditory system's neural responses to binaural stimuli are influenced by prior acoustic events, including auditory motion.
  • Investigating whether the juvenile auditory system exhibits similar plasticity is crucial for understanding auditory development.

Purpose of the Study:

  • To examine interaural level difference (ILD) processing in the developing gerbil auditory system.
  • To compare neural response characteristics in juvenile versus adult animals.

Main Methods:

  • Single neuron auditory responses in the inferior colliculus (IC) were assessed in gerbils at postnatal days 17-18, 24-25, and in adults.
  • Stimuli included virtual acoustic motion followed by steady-state ILDs.

Related Experiment Videos

  • Neuronal sensitivity to ILD and the effects of conditioned enhancement and suppression were analyzed.

    • Main Results:

    • Adult neurons exhibited long-lasting conditioned enhancement (median = 4.3s) and suppression (median = 4.5s) of discharge rates after specific auditory events.
    • Juvenile (P17-18) neurons showed significantly briefer conditioned responses (median = 1.2s).
    • The difference between conditioned and control discharge rates was 3-4 times greater in adults than in juveniles, with adult neurons showing lower excitatory than inhibitory thresholds, unlike juveniles.

    Conclusions:

    • Computational properties of juvenile and adult IC neurons differ quantitatively, likely due to an imbalance between excitation and inhibition in young animals.
    • These developmental differences may impair sound source localization accuracy and speed in young animals compared to adults.