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Sensory memory captures information from the environment in its original form for a very brief duration, just long enough to be exposed to visual, auditory, and other senses. This type of memory is detailed and rich but quickly lost unless certain strategies are employed to transfer it into short-term or long-term memory. Sensory information is continuously bombarding the human brain, yet only a small fraction is absorbed, as most of it does not significantly impact daily life. For instance,...
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Active information maintenance in working memory by a sensory cortex.

Xiaoxing Zhang1, Wenjun Yan1,2, Wenliang Wang1

  • 1State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Neuroscience, Shanghai Center for Brain Science and Brain-Inspired Technology, Chinese Academy of Sciences, Shanghai, China.

Elife
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Summary
This summary is machine-generated.

Neural activity in the anterior piriform cortex (APC) is crucial for olfactory working memory. Suppressing this activity impairs performance, demonstrating its importance for maintaining odor information during delay periods, even with distractions.

Keywords:
anterior piriform cortexdelay-period activitydual-taskmouseneuroscienceoptogeneticspopulation neural activityworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Olfactory Processing

Background:

  • Working memory is essential for cognitive tasks, involving information maintenance and manipulation.
  • The role of sensory cortex activity during delay periods in working memory remains debated.
  • The anterior piriform cortex (APC) is a key region in olfactory sensory processing.

Purpose of the Study:

  • To investigate the necessity of delay-period neural activity in the APC for olfactory working memory.
  • To determine if APC activity is important for active information maintenance, particularly under distracting conditions.

Main Methods:

  • Head-fixed mice performed olfactory working memory tasks, including a dual-task paradigm with distractions.
  • Optogenetic suppression of neuronal activity in the APC during delay periods.
  • Electrophysiological recordings of APC neuronal populations.

Main Results:

  • Optogenetic suppression of APC activity during delay periods significantly impaired task performance.
  • APC neuronal populations maintained odor information representation during the delay period, even with an intervening distracting task.
  • Evidence supports the role of delay activity in the APC for active information maintenance.

Conclusions:

  • Delay-period neural activity in the anterior piriform cortex is critical for olfactory working memory.
  • The APC actively maintains odor information, essential for task performance, even when faced with distractions.
  • These findings highlight the significance of sensory cortex activity in supporting higher-order cognitive functions like working memory.