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Related Concept Videos

Working Memory01:24

Working Memory

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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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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Bidirectional Frontoparietal Oscillatory Systems Support Working Memory.

Elizabeth L Johnson1, Callum D Dewar2, Anne-Kristin Solbakk3

  • 1Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720, USA; Department of Psychology, University of California, Berkeley, Berkeley, CA 94720, USA.

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|June 13, 2017
PubMed
Summary
This summary is machine-generated.

Working memory relies on parallel brain systems, not just the prefrontal cortex (PFC). Neural oscillations reveal a distinct posterior system supporting working memory, even with PFC damage.

Keywords:
directional connectivityexecutive controlfrontal lesionsgraph theoryoscillationsparietal cortexprefrontal cortexworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neurobiology

Background:

  • The prefrontal cortex (PFC) has long been considered central to working memory.
  • Recent research suggests posterior cortical regions also play a role, potentially dependent on executive demand.

Purpose of the Study:

  • To investigate the role of the prefrontal cortex (PFC) in working memory using neurological patients with PFC damage.
  • To explore the neural oscillatory mechanisms underlying working memory and their communication pathways.

Main Methods:

  • Compared electroencephalogram (EEG) activity and directional connectivity in 14 PFC patients and 20 healthy controls during a working memory task.
  • Analyzed neural oscillations in the low-theta and alpha-beta ranges over PFC and parieto-occipital regions.

Main Results:

  • Healthy controls showed PFC low-theta activity and PFC to parieto-occipital connectivity related to executive demand.
  • PFC patients exhibited attenuated PFC low-theta activity and connectivity but maintained working memory proficiency.
  • A parallel, PFC-independent alpha-beta oscillatory system in posterior regions was identified.

Conclusions:

  • Working memory involves neurologically dissociable PFC and parieto-occipital systems.
  • Parallel, bidirectional oscillatory mechanisms, including a posterior alpha-beta system, underpin working memory independently of the PFC.