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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Effect of age on lateralized auditory processing.

Jörg Stadler1, André Brechmann1, Nicole Angenstein1

  • 1Leibniz Institute for Neurobiology, Combinatorial NeuroImaging Core Facility, Brenneckestr. 6, 39118 Magdeburg, Germany.

Hearing Research
|May 20, 2023
PubMed
Summary
This summary is machine-generated.

Aging reduces brain connections, prompting older adults to recruit more auditory cortex for complex sound processing, especially when tasks demand greater hemispheric interaction.

Keywords:
AgingAuditory cortexCategorizationFunctional magnetic resonance imagingHemispheric specializationSequential processing

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Aging Research

Background:

  • Auditory processing lateralization varies with stimuli and tasks.
  • Aging diminishes anatomical connectivity, impacting hemispheric interaction in the auditory cortex.
  • Efficient hemispheric interaction is crucial for processing complex auditory stimuli.

Purpose of the Study:

  • To investigate the effects of aging on auditory cortex processing lateralization and hemispheric interaction.
  • To compare brain activity during auditory tasks with differing demands on hemispheric interaction in younger and older adults.

Main Methods:

  • Magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) were used.
  • Two tasks were employed: tone categorization (right-dominant) and sequential comparison (bilateral).
  • The contralateral noise procedure was utilized to assess auditory processing.

Main Results:

  • Older adults showed increased auditory cortex recruitment, particularly during the comparison task requiring greater hemispheric interaction.
  • Functional connectivity from the auditory cortex was stronger in older adults during the comparison task.
  • DTI revealed reduced fractional anisotropy and increased mean diffusivity in the corpus callosum of older adults, indicating decreased interhemispheric connections.

Conclusions:

  • Reduced anatomical interhemispheric connections in aging necessitate greater neural resources for tasks demanding functional hemispheric interaction.
  • Older adults compensate for diminished connectivity by increasing auditory cortex recruitment and functional connectivity.