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Frequency- and Intensity-Dependent After-Effects of High-Definition Transcranial Alternating Current Stimulation on Resting-State Electroencephalography

NCT07798804 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 36

Last updated 2026-09-01

No results posted yet for this study

Summary

This study aims to investigate the after-effects of high-definition transcranial alternating current stimulation (HD-tACS) with varying parameters on resting-state brain activity in patients with schizophrenia experiencing auditory hallucinations.

Conditions

  • Schizophrenia With Auditory Hallucinations

Interventions

DEVICE

high-definition transcranial alternating current stimulation(HD-tACS)

The active intervention consists of high-definition transcranial alternating current stimulation (HD-tACS) delivered using a 4×1 ring configuration (one center electrode surrounded by four return electrodes) over the personalized left or right temporal lobe. The return electrodes deliver one-quarter of the central electrode current with opposite polarity. Stimulation is administered for 90 seconds per condition, with the frequency and current intensity set according to the experimental protocol. A 10-second ramp-up and a 5-second ramp-down period are included in each stimulation condition. The stimulus waveform is sinusoidal. Stimulation is delivered using saline-soaked sponge electrodes. Electrode impedance is maintained below 10 kΩ throughout the stimulation session.

DEVICE

sham high-definition transcranial alternating current stimulation(HD-tACS)

The sham intervention consists of high-definition transcranial alternating current stimulation (HD-tACS) delivered using a 4×1 ring configuration (one center electrode surrounded by four return electrodes) over the personalized left or right temporal lobe. The return electrodes deliver one-quarter of the central electrode current with opposite polarity. To mimic the sensory experience of active stimulation, the sham condition includes a 10-second ramp-up and a 5-second ramp-down period at 0.4 mA and 140 Hz, with no current delivered during the intervening 90-second period.

Sponsors & Collaborators

  • Shanghai Mental Health Center

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Model
CROSSOVER

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2025-12-05
Primary Completion
2026-02-11
Completion
2026-02-15

Countries

  • China

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07798804 on ClinicalTrials.gov