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Updated: May 5, 2026

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Epicranial electrical stimulation improves non-navigational spatial memory in macaque monkeys.

Noa Peeleman1,2, Myles Mc Laughlin3,2, Tom Theys4,5,2

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Epicranial current stimulation (ECS) at 40 Hz improved spatial memory and activated the hippocampus in macaques. This minimally-invasive neuromodulation technique shows promise for treating memory impairments like those seen in Alzheimer's disease.

Keywords:
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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Cognitive Science

Background:

  • The hippocampus is vital for spatial memory, and its impairment is linked to Alzheimer's disease (AD).
  • Neuromodulation offers potential therapeutic benefits for AD pathology and cognitive decline.
  • Current neuromodulation outcomes vary, with limited data from large animal models.

Purpose of the Study:

  • To evaluate the efficacy of 40 Hz epicranial current stimulation (ECS) in enhancing non-navigational spatial memory.
  • To investigate the impact of ECS on hippocampal activity using functional magnetic resonance imaging (fMRI).

Main Methods:

  • Three rhesus macaques underwent surgery for bilateral skull electrode implantation.
  • Animals were trained on a non-navigational spatial memory task with 40 Hz or 10 Hz ECS applied.
  • ECS-fMRI was conducted to map brain activation patterns during stimulation.

Main Results:

  • 40 Hz ECS significantly improved spatial memory performance, whereas 10 Hz ECS showed limited or detrimental effects.
  • Concurrent ECS-fMRI revealed widespread brain activation at 40 Hz, notably including the hippocampus.
  • No significant hippocampal activation was observed with 10 Hz ECS.

Conclusions:

  • 40 Hz ECS is a potentially effective and minimally invasive method for enhancing memory and activating the hippocampus.
  • ECS may offer a novel therapeutic strategy for individuals experiencing memory deficits.