Representation of spectral and temporal sound features in three cortical fields of the cat. Similarities outweigh differences.

  • Eggermont J
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Abstract

This study investigates the degree of similarity of three different auditory cortical areas with respect to the coding of periodic stimuli. Simultaneous single- and multiunit recordings in response to periodic stimuli were made from primary auditory cortex (AI), anterior auditory field (AAF), and secondary auditory cortex (AII) in the cat to addresses the following questions: is there, within each cortical area, a difference in the temporal coding of periodic click trains, amplitude-modulated (AM) noise bursts, and AM tone bursts? Is there a difference in this coding between the three cortical fields? Is the coding based on the temporal modulation transfer function (tMTF) and on the all-order interspike-interval (ISI) histogram the same? Is the perceptual distinction between rhythm and roughness for AM stimuli related to a temporal versus spatial representation of AM frequency in auditory cortex? Are interarea differences in temporal response properties related to differences in frequency tuning? The results showed that: 1) AM stimuli produce much higher best modulation frequencies (BMFs) and limiting rates than periodic click trains. 2) For periodic click trains and AM noise, the BMFs and limiting rates were not significantly different for the three areas. However, for AM tones the BMF and limiting rates were about a factor 2 lower in AAF compared with the other areas. 3) The representation of stimulus periodicity in ISIs resulted in significantly lower mean BMFs and limiting rates compared with those estimated from the tMTFs. The difference was relatively small for periodic click trains but quite large for both AM stimuli, especially in AI and AII. 4) Modulation frequencies

Author-supplied keywords

  • Acoustic Stimulation
  • Action Potentials
  • Action Potentials: physiology
  • Animals
  • Auditory Cortex
  • Auditory Cortex: anatomy & histology
  • Auditory Cortex: physiology
  • Auditory Perception
  • Auditory Perception: physiology
  • Brain Mapping
  • Cats
  • Periodicity
  • Reaction Time
  • Reaction Time: physiology
  • Time Factors

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Authors

  • J J Eggermont

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