High-Definition Transcranial Direct Current Stimulation Improves Delayed Memory in Alzheimer's Disease Patients: A...

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• Optimal transcranial direct current stimulation (tDCS) parameters for enhancing memory in Alzheimer's disease (AD) are not well-established.
• Individual brain anatomy significantly impacts tDCS current distribution, a factor potentially exacerbated by cortical atrophy in AD patients.

Purpose of the Study:

• To evaluate the efficacy of individualized high-definition tDCS (HD-tDCS) in improving cognitive function in patients with Alzheimer's disease.

Main Methods:

• Nineteen AD patients received either active or sham HD-tDCS.
• Computational modeling based on MRI determined optimal montages for individual electric field distribution.
• Cognitive tests and neuroimaging (MRI, DTI) were analyzed pre- and post-intervention.

Main Results:

• Individualized montages were optimal for each patient.
• The active HD-tDCS group showed significant improvements in delayed memory and MMSE scores compared to the sham group.
• A positive correlation was observed between fractional anisotropy in the anterior thalamic radiation and delayed memory performance in the active group.

Conclusions:

• HD-tDCS effectively improved delayed memory in individuals with Alzheimer's disease.
• This study serves as a proof-of-concept for enhancing tDCS efficacy through individualization.
• Larger sample sizes are needed to confirm these findings.