Single Session of tACS in a Depressive Episode — SSDE  

Depression Clinical Trial

Official title: Rational Optimization of tACS for Targeting Thalamo-Cortical Oscillations (Experiment 3)

Status Completed

Clinical Trial Summary

Purpose: Investigating the effects of non-invasive transcranial alternating current stimulation (tACS) on healthy participants and participants with mood disorders.

Participants: 40 males and females, ages 18-65, with depressed mood; 40 healthy males and females, ages 18-65, free of neurological or psychiatric conditions.

Procedures: This is a single visit study with two stimulation conditions (tACS and sham tACS). The session will begin with clinical assessments (including confirmation of diagnosis), followed by an interactive EEG task, then a 7 minute resting state EEG (2 minutes eyes closed, 5 minutes eyes open), followed by the stimulation session (40 minutes of tACS or sham tACS), followed by an additional 5 minute resting state EEG. The stimulation will involved 40 minutes of transcranial alternating current stimulation, 2 mA in amplitude and at individualized alpha frequency (determined by the 2 minutes eyes closed EEG recording; between 8 and 12Hz).

Clinical Trial Description

Participants will report for a study visit and will review and sign a consent form.

Participants will complete several clinical assessments and also take a urine drug test and urine pregnancy test (if applicable). Eligibility will be re-assessed by the investigators before the participant moves on to the next phase.

If the participant still qualifies, the participant will first be fitted with two 5x5cm electrodes placed over F3/F4 (10-20 measurement system) and one 5x7cm electrode placed over Cz. In addition, the participant will have a 128-channel EEG net placed on their head. Participants will provide a saliva sample to assess for brain-derived neurotrophic factor (BDNF), which may affect how the participant's brain responds to stimulation. Once the participant is fitted with this equipment, the participant will complete two interactive EEG tasks, then 2-minute resting state EEG with the participant's eyes closed, then a 5-minute resting state EEG with the participant's eyes open.

Following these recordings, participants will respond to additional questionnaires. Immediately following this, the participant will receive 40 minutes of stimulation (tACS or sham tACS). During this stimulation, participants will sit comfortably upright and awake.

After stimulation has completed, participants will respond to additional questionnaires. Once completed, participants will then complete an additional 5-minute resting state EEG with the participant's eyes open, as well as complete one of the additional interactive EEG tasks.

Finally, participants will respond to a blinding questionnaire to assess if the participant thought that the participant received stimulation. Once complete, the participant will leave. This session is estimated to last about 4 hours. ;

Related Conditions & MeSH terms

• Depression
• Depressive Disorder
• Depressive Disorder, Major
• Depressive Episode
• Disease
• Major Depressive Disorder
• Premenstrual Dysphoric Disorder

• NCT number: NCT03449979
• Study type: Interventional
• Source: University of North Carolina, Chapel Hill
• Status: Completed
• Phase: N/A
• Start date: September 19, 2018
• Completion date: August 16, 2019