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Frontal midline HD-tACS protocol delivering 3 Hz theta stimulation at Fz with a 4x1 ring montage

Design · All designs
Evidence · 1 claim (1 for) · 1 study (1 causal), q3 · 1 of 1 report an effect size · 1 claim rests on one study

Description

The stimulation apparatus is a battery-driven constant-current generator connected to a passive 4 × 1 HD-tDCS distributor delivering alternating current via five small circular electrodes in a ring montage, which "can stimulate the target region more intensively than the classical bipolar electrode montage." For the frontal theta group the central electrode was Fz, chosen for the implicated role of midline frontal theta in memory; ring electrodes were AF4, AF3, FC2, and FC1. Stimulation was 3 Hz at 1.5 mA peak-to-peak for 20 min, with 30-s ramps; sham used ramp-up/ramp-down only to preserve blinding.

Design Implications

Context

Requirements

  • Conductive gel applied under electrodes with impedance kept under 1 quality unit per electrode to maintain contact quality

Constraints

  • Current-flow modeling estimated relatively low electric field changes (0.12 mV/mm frontal, 0.28 mV/mm parietal), lower than intensities usually required to induce neural entrainment (~0.3–0.4 mV/mm)

Target Learners

  • adult undergraduate students

Learning Goals

  • episodic memory for studied object pictures

Claims

Examples

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Key Sources

  • Limor Shtoots, Asher Nadler, Roni Partouche, Dorin Sharir, Aryeh Rothstein, Liran Shati & Daniel A. Levy. (2024). Frontal midline theta transcranial alternating current stimulation enhances early consolidation of episodic memory. npj Science of Learning 9:8. https://doi.org/10.1038/s41539-024-00222-0
Page metadata
Field Value
type design
id frontal-midline-hd-tacs-protocol-fz-3hz
title Frontal midline HD-tACS protocol delivering 3 Hz theta stimulation at Fz with a 4x1 ring montage
description The stimulation apparatus is a battery-driven constant-current generator connected to a passive 4 × 1 HD-tDCS distributor delivering alternating current via five small circular electrodes in a ring montage, which "can...
status review
generated by process:settle-candidates on 2026-10-27
trust unverified — no one has confirmed this page's content
sources 1 — limor-shtoots-2024

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