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Related Experiment Videos

Contralateral White Noise Selectively Changes Right Human Auditory Cortex Activity Caused by a FM-Direction Task.

Nicole Behne1, Henning Scheich, André Brechmann

  • 1Leibniz Institute for Neurobiology, Brenneckestr. 6, 39118 Magdeburg, Germany. nbehne@ifn-magdeburg.de

Journal of Neurophysiology
|September 10, 2004
PubMed
Summary

The right auditory cortex (AC) is crucial for distinguishing rising from falling frequency-modulated (FM) tones. This brain region shows specialized processing, especially when auditory information is presented to one ear.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • The auditory cortex (AC) is known to process complex auditory information.
  • Hemispheric specialization in the AC for processing frequency-modulated (FM) tones is suggested by prior research.

Purpose of the Study:

  • To investigate the role of the right auditory cortex in the directional categorization of FM tones.
  • To analyze binaural and monaural representations of FM tones and the effect of contralateral white noise.

Main Methods:

  • Two functional magnetic resonance imaging (fMRI) experiments were conducted.
  • Subjects performed a directional categorization task with FM tones presented binaurally or monaurally, with and without contralateral white noise.

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Main Results:

  • In Experiment 1, contralateral FM tone presentation elicited the strongest AC activation, followed by binaural, then ipsilateral.
  • In Experiment 2, contralateral white noise did not affect left AC activation but significantly increased right AC activation for ipsilateral FM tones.

Conclusions:

  • The right auditory cortex plays a critical role in the directional categorization of FM tones.
  • This specialization is particularly evident for ipsilateral auditory input processed in the presence of competing noise.