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Related Concept Videos

Working Memory01:24

Working Memory

160
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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Role of Cerebellum and Prefrontal Cortex in Memory01:14

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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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Causal functional maps of brain rhythms in working memory.

Miles Wischnewski1,2, Taylor A Berger1, Alexander Opitz1

  • 1Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455.

Proceedings of the National Academy of Sciences of the United States of America
|March 27, 2024
PubMed
Summary
This summary is machine-generated.

Noninvasive brain stimulation using transcranial alternating current stimulation (tACS) can improve working memory. Specifically, theta and gamma oscillations in targeted brain regions enhance cognitive performance, while prefrontal gamma stimulation is detrimental.

Keywords:
brain mappingcomputational modelingneuromodulationworking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging and Neuromodulation

Background:

  • Human working memory involves complex brain networks, but causal links between specific brain regions and performance remain unclear.
  • Correlative neuroimaging studies provide limited insight into critical hubs controlling working memory capacity.
  • Transcranial alternating current stimulation (tACS) enables causal investigation through safe, targeted neuromodulation.

Purpose of the Study:

  • To synthesize evidence from placebo-controlled studies using tACS to investigate the causal role of neural oscillations in working memory.
  • To identify specific brain regions and frequency bands critical for working memory function.
  • To explore dose-dependent effects and spatial specificity of neuromodulation on working memory performance.

Main Methods:

  • Meta-analysis of 28 placebo-controlled tACS studies involving 1,057 healthy adults examining working memory.
  • Computational meta-modeling to simulate tACS interventions in virtual brains and correlate electric fields with behavioral outcomes.
  • Analysis of frequency-specific stimulation effects on neural oscillations (theta and gamma) in various brain regions.

Main Results:

  • Stimulating anterior frontal and medial temporal theta oscillations, and occipitoparietal gamma rhythms significantly improved working memory accuracy.
  • Modulating prefrontal gamma oscillations detrimentally affected working memory performance.
  • Distinct spatial expression of theta subbands showed orbitofrontal high-theta and medial temporal low-theta modulation influenced working memory.

Conclusions:

  • Theta and gamma oscillations in specific brain regions causally influence working memory performance.
  • Findings offer a novel perspective on working memory mechanisms, complementing neuroimaging research.
  • Identified targets provide a basis for developing clinical treatments for working memory deficits.