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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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Related Experiment Video

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The causal role of auditory cortex in auditory working memory.

Liping Yu1, Jiawei Hu1, Chenlin Shi1

  • 1Key Laboratory of Brain Functional Genomics (Ministry of Education and Shanghai), Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, and School of Life Sciences, East China Normal University, Shanghai, China.

Elife
|April 29, 2021
PubMed
Summary

Auditory cortex activity is crucial for maintaining information in working memory (WM). Suppressing this activity early in the delay period impairs WM performance in mice, highlighting its essential role.

Keywords:
auditory cortexmicemouseneuroscienceworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Processing

Background:

  • Working memory (WM) involves holding information over short delays.
  • Delay-period activity in sensory cortices is observed in WM tasks.
  • The functional role of this activity for memory maintenance is unclear.

Purpose of the Study:

  • To investigate the causal role of the auditory cortex (AC) in auditory working memory (WM) maintenance.
  • To determine when AC activity is critical for auditory WM performance.

Main Methods:

  • Mice performed an auditory WM task.
  • Electrophysiological recordings monitored AC neural activity.
  • Optogenetic suppression targeted AC neural activity during specific task epochs.

Main Results:

  • AC neurons showed activity during stimulus presentation and early delay periods.
  • Optogenetic suppression of AC activity during the stimulus and early delay impaired WM performance.
  • Suppression later in the delay period did not affect WM performance.

Conclusions:

  • The auditory cortex is essential for encoding and maintaining information in auditory WM.
  • Early delay period activity in the AC plays a critical functional role in auditory WM.