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Speech offsets activate the right parietal cortex.

Takashi Hamada1, Sunao Iwaki, Tsuneo Kawano

  • 1National Institute of Advanced Industrial Science and Technology (AIST), Kansai Centre, 1-8-31, Midoriga-oka, Ikeda 563-8577, Osaka, Japan. hamada-takashi@aist.go.jp

Hearing Research
|September 8, 2004
PubMed
Summary
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Sudden speech silences (speech offsets) activate brain hemispheres differently. The right parietal cortex shows later activation, suggesting a role in auditory attention.

Area of Science:

  • Neuroscience
  • Auditory Processing
  • Cognitive Neuroscience

Background:

  • Sudden acoustic changes, like speech offsets, are crucial for auditory scene analysis.
  • Previous research indicates hemispheric asymmetries in auditory processing.

Purpose of the Study:

  • To investigate the differential hemispheric activation patterns following speech offsets.
  • To explore the role of specific cortical regions in processing speech-induced silence.
  • To examine the influence of auditory attention on the neural response to speech offsets.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) or electroencephalography (EEG) to measure brain activity.
  • Presentation of speech stimuli followed by sudden silence (speech offsets).
  • Analysis of event-related potentials or BOLD signals to identify temporal and spatial brain activation patterns.

Related Experiment Videos

Main Results:

  • Speech offsets elicited distinct activation patterns in the bilateral temporal cortices around 120 ms post-offset.
  • A delayed activation was observed in the right parietal cortex, independent of the ear stimulated.
  • These findings suggest a right-hemisphere bias for processing speech-related silence.

Conclusions:

  • The brain processes sudden speech silences differently across hemispheres.
  • The right parietal cortex plays a significant role in the later stages of processing speech offsets.
  • These results contribute to understanding the neural basis of auditory attention and speech perception.