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Related Experiment Videos

Dynamics of auditory-vocal interaction in monkey auditory cortex.

Steven J Eliades1, Xiaoqin Wang

  • 1Laboratory of Auditory Neurophysiology, Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|February 4, 2005
PubMed
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Neural activity in the auditory cortex changes during vocalization. These changes are linked to the sound features of self-produced vocalizations, showing specific suppression patterns and variability between neurons.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Primate Auditory Cortex Research

Background:

  • Single neurons in the primate auditory cortex show variable responses during vocalization.
  • Previous research indicates modulation of cortical activity during self-initiated vocal production.

Purpose of the Study:

  • To investigate dynamic patterns of vocalization-related modulations in the auditory cortex.
  • To determine the relationship between cortical activity variability and acoustic structures of self-produced vocalizations.

Main Methods:

  • Recording single-unit activity in the primate auditory cortex during vocalization.
  • Analyzing temporal specificity and acoustic correlations of neural modulations.
  • Performing simultaneous recordings of nearby neuron pairs.

Related Experiment Videos

  • Examining the distribution of vocalization-induced suppression across cortical layers.

    • Main Results:

    • Vocalization-related neural suppression was temporally specific, occurring during vocal phrases but released between them.
    • The degree of neural suppression or excitation correlated with the mean energy and frequency of vocalizations, explaining much response variability.
    • Modulations in nearby neurons were largely uncorrelated.
    • Vocalization-induced suppression was preferentially observed in upper cortical layers.

    Conclusions:

    • Cortical modulations during vocalization are dynamically linked to the acoustic properties of self-produced sounds.
    • Neural responses exhibit significant variability between individual neurons and vocalization instances, explained by acoustic features.
    • Auditory cortex activity during vocalization, when summed, results in a weakly excitatory overall response.