Healthy
Conditions
Keywords
tACS, transcranial alternating current stimulation, stimulation, healthy control, alpha oscillations, heart rate variability
Brief summary
\*\*Follow-up Control Study for Creativity Study Purpose: To investigate the effect of transcranial alternating current stimulation (tACS), a form of noninvasive brain stimulation, in healthy subjects. This experiment is a follow-up to previous tACS studies that used a creativity assessment. Participants: 35 males and females, at least 18 years of age, without history of major psychiatric/neurological disease or associated medication use, or prior brain surgery/implants. Procedures (methods): This is a cross-over study design. Participants will undergo a control condition of stimulation (sham or individual alpha, 8-12 Hz, tACS) during electroencephalogram recordings. In addition, pupil diameter, heart rate, and respiration will be measured continuously. This is to study the physiological effects of stimulation.
Detailed description
Participants will report for a study visit. They will review and sign a consent form. They will first be fitted with two 5x7cm electrodes placed over occipital and parietal cortex (Cz and Oz). They will also be fitted with ECG electrodes as well as a respiration belt. In addition, they will have a 128-channel EEG net placed on their head and pupillometry glasses. Once the participant is fitted with this equipment, they will complete a 2-minute resting state EEG with their eyes closed to determine their individual alpha frequency. Following the individual alpha frequency determination, the participant will fill out an alertness questionnaire, followed by 3 EEG recordings: 1. 5 minute before stimulation recording 2. 20 minute recording during stimulation; either at their individual alpha frequency (between 8 and 12 Hz) or sham stimulation. 3. 5 minute after stimulation recording Following these three recordings, the participant will have a 20 minute break in which they will read neutral reading material or converse with the study staff, as well as provide a saliva sample to test for brain derived neurotropic factor (BDNF). After the 20 minute break, the participant will complete the alertness questionnaire, and the three recordings will be completed again. The participant will then be allowed to clean up, be paid, and leave. \------------------------ Clarification for the Experimental Design: This part of the study is a control condition that will consist of stimulation over occipital and parietal cortex with electrodes over Cz and Oz. Participants will then receive 2mA alternating current stimulation between 8Hz and 12Hz (based on their individual alpha frequency determined by a 2 min eyes closed recording) or sham stimulation for 20 minutes (approximately the duration of the TTCT test) in a resting condition where they will have to focus on a cross hair on a computer screen. EEG will be collected simultaneously during this. In both conditions, the participants wear a Pupil eye tracking headset, which is commercially available. This allows to monitor eye movements and to obtain physiological relevant measures of the pupil. To obtain a measure of the heart rate during both conditions, ECG electrodes as part of the EEG acquisition system are placed on the participant's body. Ideally one electrode below the left collarbone and a second below the right chest. Respiration Effort is measured in both conditions by a SleepSense sleep-lab sensor that is placed with an elastic band over the participants chest and connected to the EEG acquisition system. Before each session, a questionnaire will be administered to the participant to assess the alertness state. The entire procedure will be conducted by study personnel with documented training using brain stimulators and EEG.
Interventions
OTHERNeuroConn Plus Stimulator tACS
Transcranial alternating current stimulation (tACS) is a novel, noninvasive brain stimulation approach in which weak electric currents are applied to the scalp. The electric currents that are applied to the scalp are in a sine-wave pattern.
OTHERNeuroConn Plus Stimulator Sham
For sham stimulation, the participant receives up to 1 minute of tACS stimulation until the stimulation fades. This mimics the same skin sensations that a participant would experience during a tACS session.
Sponsors
University of North Carolina, Chapel Hill
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
DOUBLE (Subject, Investigator)
Masking description
This is a double-blind study, meaning that neither the participant nor the experimenter knows what kind of stimulation the participant is receiving. An unblinded monitor (separate from the staff that interacts with the participant) is responsible for creating the stimulation codes that run each session and for ensuring that these codes worked correctly.
Intervention model description
Each participant will receive sham stimulation or stimulation at their individual alpha frequency (8-12 Hz) during a study visit. The order is randomized (i.e., half of participants will receive sham stimulation during the first stimulation session and half will receive sham stimulation during the second stimulation session).
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Males and females at least 18 years of age
Exclusion criteria
* History of major neurological or psychiatric illness, including epilepsy * Medication use associated with neurological or psychiatric illnesses * Currently undergoing counseling or psychotherapy treatment for depression, anxiety, eating disorders, PTSD, or other behavior conditions * First degree relative (parent, sibling, child) with neurological or psychiatric illness (past and present) * Prior brain surgery * Head injury * Any brain devices/implants (including cochlear implants and aneurysm clips) * Cardiovascular disease * Pregnancy
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Electroencephalogram power in alpha band | 5 minute recordings before and after each 20 minute stimulation session during a single study visit. | Changes in the EEG power in the alpha (8-12 Hz) band before and after stimulation sessions. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Heart Rate Variability | 5 minute recordings before and after each 20 minute stimulation session during a single study visit. | Change in the ratio between the power in low frequency band and the power in high frequency band. As this outcome variable is a ratio between two items that are measured in microvolt\^2, the ratio does not have a unit of measure. |
| Pupil diameter | 5 minute recordings before and after each 20 minute stimulation session during a single study visit. | Pupil diameter is associated with arousal. We will look to see what the changes in arousal are before and after stimulation sessions. |
Outcome results
None listed