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Related Concept Videos

Working Memory01:24

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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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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Jun 14, 2025

Transcranial Direct Current Stimulation tDCS for Memory Enhancement
10:37

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Published on: September 18, 2021

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TDCS over PPC or DLPFC does not improve visual working memory capacity.

Shuangke Jiang1, Myles Jones2, Claudia C von Bastian3

  • 1Department of Psychology and Neuroscience Institute, University of Sheffield, Sheffield, UK. jiangshuangke@gmail.com.

Communications Psychology
|September 6, 2024
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Summary
This summary is machine-generated.

This study found no evidence that transcranial direct current stimulation (tDCS) over the posterior parietal cortex improves visual working memory (VWM). The results challenge previous findings, suggesting tDCS may not enhance VWM capacity or precision.

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Area of Science:

  • Cognitive Neuroscience
  • Neurostimulation

Background:

  • Non-invasive brain stimulation, like transcranial direct current stimulation (tDCS), is explored for cognitive enhancement.
  • Previous studies on tDCS and visual working memory (VWM) show inconsistent results, potentially due to methodological limitations.

Purpose of the Study:

  • To conceptually replicate a high-profile study on anodal tDCS over the posterior parietal cortex (PPC) and dorsolateral prefrontal cortex (DLPFC) for VWM capacity and precision.
  • To address methodological issues and increase statistical power compared to the original study.

Main Methods:

  • A pre-registered conceptual replication study with 48 participants.
  • Participants received counterbalanced anodal tDCS over PPC, DLPFC, or sham stimulation.
  • A continuous orientation-reproduction task was used to assess VWM capacity and precision across different loads.

Main Results:

  • No evidence was found for a selective improvement in VWM capacity or precision following PPC stimulation.
  • tDCS effects on VWM were absent regardless of stimulation site (PPC or DLPFC) or VWM load.
  • Bayesian evidence substantially supported the absence of tDCS effects.

Conclusions:

  • Single-session anodal tDCS over the PPC does not appear to enhance VWM capacity or precision.
  • The findings challenge previous reports of cognitive benefits from PPC-tDCS on VWM.
  • Methodological rigor and adequate sample sizes are crucial for reliable neurostimulation research.