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Related Experiment Videos

Processing of sound sequences in macaque auditory cortex: response enhancement.

M Brosch1, A Schulz, H Scheich

  • 1Leibniz-Institut für Neurobiologie, 39118 Magdeburg, Germany.

Journal of Neurophysiology
|September 14, 1999
PubMed
Summary

Auditory cortex neurons show enhanced responses to a second tone when preceded by a first tone. This response enhancement, distinct from attenuation, is crucial for processing sound

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Processing

Background:

  • Neuronal responses in the auditory cortex can be attenuated by preceding sounds.
  • The phenomenon of response enhancement by preceding sounds is less understood.

Purpose of the Study:

  • To investigate the phenomenon of enhanced neuronal responses in the auditory cortex.
  • To characterize the conditions under which response enhancement occurs.

Main Methods:

  • Recorded action potentials from multiunit and single units in macaque monkey auditory cortex.
  • Presented pairs of suprathreshold tones with varying frequency and stimulus onset asynchrony (SOA).

Main Results:

  • A preceding tone significantly enhanced the response to a second tone in 87/130 multiunit groups and 29/69 single units.

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  • Enhancement occurred across a wide range of SOAs (110-329 ms) and first tone frequencies.
  • Maximal enhancement was observed with a 120 ms SOA and an octave frequency separation.

    • Conclusions:

    • Response enhancement is a fundamental neural mechanism in the auditory cortex.
    • This mechanism complements response attenuation in processing the temporal structure of sounds.