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Related Concept Videos

Working Memory01:24

Working Memory

156
Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Neuronal activation sequences in lateral prefrontal cortex encode visuospatial working memory during virtual

Alexandra Busch1,2,3, Megan Roussy1,2,4, Rogelio Luna1,2,4

  • 1Robarts Research Institute, University of Western Ontario, London, ON, Canada.

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|May 25, 2024
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Summary
This summary is machine-generated.

Neural activation sequences (NASs) support working memory (WM) by encoding spatial information in virtual reality. This code is adaptable, unlike persistent firing, and is impaired by ketamine.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Primate Research

Background:

  • Working memory (WM) involves maintaining and manipulating information.
  • The neural basis of WM, particularly the codes used, remains debated.
  • Understanding WM neural codes is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the neural codes underlying visuospatial working memory.
  • To compare neuronal activation sequences (NASs) with persistent firing codes.
  • To examine the role of NMDA receptors in WM neural coding.

Main Methods:

  • Simultaneous multi-unit recordings from the lateral prefrontal cortex of macaque monkeys.
  • Visuospatial WM task involving navigation in a virtual 3D environment.
  • Pharmacological manipulation using ketamine to block NMDA receptors.

Main Results:

  • Distinct neuronal activation sequences (NASs) were identified encoding remembered locations in a virtual environment.
  • NAS codes outperformed persistent firing codes in the virtual reality task.
  • Ketamine selectively impaired NAS codes and behavioral performance during the WM task.

Conclusions:

  • Neural codes for working memory are versatile and adaptable, particularly in dynamic environments.
  • Neuronal activation sequences represent a key neural code for visuospatial working memory.
  • NMDA receptor function is critical for effective NAS-based working memory.