NCT06259916 · Colorado State University
Distinguishing Alcohol Intoxication, Cannabis Intoxication and Co-intoxication Using Electroencephalography (EEG)
What this study is about
This is a randomly assigned, parallel-group study designed to explore the differences between cannabis intoxication, alcohol intoxication and co-intoxication involving both alcohol and cannabis, utilizing electroencephalography (EEG) as well as more traditional intoxication measures such as breath alcohol concentration and balance metrics.
View original scientific description
This is a randomized, parallel-group study designed to explore the differences between cannabis intoxication, alcohol intoxication and co-intoxication involving both alcohol and cannabis, utilizing electroencephalography (EEG) as well as more traditional intoxication measures such as breath alcohol concentration and balance metrics. If eligible for the study, participants will be randomized to complete one study session in our mobile laboratory, during which they will use either alcohol, cannabis (which will be self-administered, ad libitum) or both alcohol and cannabis.
Interventions
OTHER
Alcohol
Participants in this condition will receive the standard alcohol dose
OTHER
Cannabis
Participants in this group will self-administer legal-market flower cannabis
Primary outcome measures
Electroencephalography (EEG) Objective Cognitive Function Measures--Amplitude (microvolts)
Time frame: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use
The EEG amplitude (measured in microvolts) will be obtained while participants perform the speeded visual flanker task
Electroencephalography (EEG) Objective Cognitive Function Measures--Latency (milliseconds)
Time frame: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use
The EEG latency (measured in milliseconds) will be obtained while participants perform the speeded visual flanker task
Standing postural stability
Time frame: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use
An iPod Touch will be attached to each participant's hip with a simple elastic/Velcro strap. An app on the device will record fine grained movements while they try to stand as still as possible for 30-60 seconds under four conditions that vary in terms of demand on the proprioceptive system (eyes open, eyes closed), and on a stable vs. soft (foam) surface.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- 21-50 years old
- Heavy drinkers (consuming more than 4 drinks/day or more than 14 drinks/week for men, or more than 3 drinks/day or more than 7 drinks/week for women)
- Regular users of legal-market flower cannabis (at least 2x/week in past 3 months)
- report simultaneously using alcohol and legal-market flower cannabis at least once per month in the past 3 months
- English speakers.
Exclusion criteria
- Daily tobacco users
- Diagnosed with or seeking treatment for alcohol use disorder (AUD) or other substance use disorder (SUD)
- Females cannot be pregnant, breastfeeding or trying to become pregnant
- Meet criteria for psychotic, bipolar or major depressive disorder with suicidal ideation, or history of these disorders, 5) Current use of psychotropic (except anti-depressants)
- Report illicit drug use in past 60-days or fail drug screen on the day of the study appointment
- Major medical condition contraindicating alcohol and/or cannabis consumption.
Where
- Fort Collins, Colorado
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Nov 13, 2025 · Source of record for eligibility and locations