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Related Experiment Video

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Transcranial Direct Current Stimulation (tDCS) for Memory Enhancement

Transcranial Direct Current Stimulation (tDCS) for Memory Enhancement

Published on: September 18, 2021

Temporal cortex direct current stimulation enhances performance on a visual recognition memory task in Alzheimer

P S Boggio¹, L P Khoury, D C S Martins

¹Center for Health and Biological Sciences, Mackenzie Presbyterian University, São Paulo, Brazil. boggio@mackenzie.br

Journal of Neurology, Neurosurgery, and Psychiatry

|November 4, 2008

Summary

Anodal transcranial direct current stimulation (tDCS) improved visual recognition memory in Alzheimer disease (AD) patients. This non-invasive neuromodulation technique shows promise for enhancing memory components in AD.

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Area of Science:

Neuroscience
Neurology
Cognitive Science

Background:

Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulation technique.
Previous studies suggest tDCS enhances working memory in healthy individuals and Parkinson disease patients.
Alzheimer disease (AD) is characterized by cognitive decline, including memory impairments.

Purpose of the Study:

To investigate the effects of anodal tDCS on recognition memory, working memory, and selective attention in patients with Alzheimer disease (AD).

Main Methods:

Ten AD patients received three sessions of anodal tDCS (left dorsolateral prefrontal cortex, left temporal cortex) or sham stimulation.
Stimulation parameters: 2 mA intensity for 30 minutes, randomized order on different days.
Cognitive assessments included the Stroop task (attention), Digit Span (working memory), and a Visual Recognition Memory task (VRM).

Main Results:

A significant effect of stimulation condition was observed on the Visual Recognition Memory task (VRM) (p = 0.0085).
Post hoc analysis revealed significant improvements in VRM after temporal (p = 0.01) and prefrontal (p = 0.01) tDCS compared to sham stimulation.
No significant changes were found in attention performance on the Stroop task.

Conclusions:

This study provides the first evidence that tDCS can enhance a component of recognition memory in Alzheimer disease (AD) patients.
Anodal tDCS applied to prefrontal and temporal cortices may improve visual recognition memory.
Further research is warranted to explore the mechanisms and clinical implications of tDCS for AD-related memory deficits.