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Hemispheric specializations affect interhemispheric speech sound integration during duplex perception.

Basil C Preisig1, Matthias J Sjerps1

  • 1Donders Institute for Brain, Cognition and Behavior, Radboud University, P.O. Box 9101, Nijmegen, 6500 HB, The Netherlandsbasilpreisig@gmx.ch, m.j.sjerps@gmail.com.

The Journal of the Acoustical Society of America
|May 10, 2019
PubMed
Summary
This summary is machine-generated.

Speech spectral information processing is faster with initial right-hemisphere stimulation. This suggests the right hemisphere plays a dominant role in processing these auditory cues, impacting speech perception.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Processing

Background:

  • Hemispheric lateralization influences sensory information processing.
  • The role of the right hemisphere in spectral processing for speech remains debated.

Purpose of the Study:

  • To investigate if speech spectral information processing is enhanced by initial right or left hemisphere activation.
  • To determine the dominant hemisphere for spectral cue integration in speech perception.

Main Methods:

  • Normal hearing participants performed a speech categorization task.
  • An ambiguous speech sound (/ga/ vs /da/) was presented to one ear, with a disambiguating chirp to the other.
  • Chirp presentation ear (left vs. right) was varied to manipulate initial hemispheric processing.

Main Results:

  • Response times were significantly shorter when the disambiguating chirp was presented to the left ear (initial right-hemisphere processing).
  • No significant differences were observed in the strength of overall speech sound integration between ears.
  • Faster reaction times indicate a benefit from initial right-hemisphere processing of spectral information.

Conclusions:

  • The findings support the hypothesis of right-hemisphere dominance for processing spectral information crucial for speech perception.
  • Initial processing by the right hemisphere appears to facilitate faster categorization of speech sounds based on spectral cues.