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A distributed cortical network for auditory sensory memory in humans

C Alain1, D L Woods, R T Knight

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, 3560 Bathurst Street, North York, Toronto, Ontario, Canada. calain@rotman-baycrest.on.ca

Brain Research
|November 14, 1998
PubMed
Summary

Auditory sensory memory relies on a temporal-prefrontal network. Damage to these areas impairs auditory processing and memory, highlighting the brain

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Psychology

Background:

  • Auditory sensory memory is crucial for integrating incoming sounds with past auditory events.
  • Understanding its neural basis is key to auditory perception research.

Purpose of the Study:

  • To investigate the neural circuits underlying auditory sensory memory.
  • To determine the roles of the dorsolateral prefrontal cortex, posterior association cortex, and hippocampus in auditory sensory memory.

Main Methods:

  • Utilized behavioral and electrophysiological measures in patients with unilateral brain damage.
  • Employed mismatch negativity (MMN) as a neurophysiological marker of automatic sensory memory.
  • Compared patient groups (temporal-parietal, dorsolateral prefrontal, hippocampal lesions) with control subjects.

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Main Results:

  • Temporal-parietal lesions impaired auditory discrimination and reduced MMNs contralateral to the lesion, suggesting contralateral auditory cortex storage.
  • Dorsolateral prefrontal damage impaired performance and MMNs bilaterally, indicating a facilitatory role.
  • Hippocampal lesions showed no significant effects on auditory sensory memory measures.

Conclusions:

  • Auditory sensory memory involves a temporal-prefrontal neocortical network.
  • The auditory cortex plays a contralateral role in storing auditory sensory memories.
  • Dorsolateral prefrontal cortex exerts a bilateral facilitatory influence on auditory sensory memory.