About this trial
This study seeks to understand individual differences in personality, brain function, and behavior.
Study hypothesis:
\- A stronger sign-tracking bias will be associated with a bottom-up processing style characterized by less adaptive attentional- and impulse-control as well as hyperactive reward processing, whereas a stronger goal-tracking bias will be associated with a top-down processing style characterized by strong attentional- and impulse-control as well as normative reward processing.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
18-22 years old at baseline
Right-handed
Medically/physically able to give informed consent
English-speaking
Disqualifiers
Acute or chronic medical or neurological illness (e.g., diabetes, epilepsy, migraine)
History of psychosis in self or first-degree relative
Current treatment for substance use disorder
Current or past 6-month treatment with centrally acting medications (not including attention deficit hyperactivity disorder (ADHD) medication)
Trial design
Single group
Treatments tested in this trial
fMRI
DeviceParticipants will have an MRI to scan participants brains and will wear skin conductance electrodes on the hand and fill out questionnaires. Scanning will take approximately 90 minutes. While lying in the scanner, participants will be asked to perform some tasks. The tasks will be presented to participants visually on a screen in the scanner and eye movements will also be tracked during some of these tasks. Participants will respond to stimuli with button presses that are recorded by computer.
Questionnaires and surveys
BehavioralParticipants will have multiple visits during this study and fill out various surveys at these visits.
Behavioral tasks and eye tracking
BehavioralParticipants will perform behavioral tasks while having eye-tracking hardware monitor participants eye movements. A video camera will be used to record eye movements during the behavioral tasks.
Treatment groups
Trial outcomes
Primary outcomes
Correlation between Pavlovian conditioned approach (PavCA) bias score (out-of-scanner) and composite cannabis use score
PavCA bias score based on eye gaze during the Pavlovian conditioned approach task will be correlated with a cannabis use composite score based on the Substance Use History and Timeline Follow-Back.
Secondary outcomes
Correlation between PavCA bias score (out-of-scanner) and activation from the Cannabis Cue Reactivity Task (P-CAN)
PavCA bias score based on eye gaze during the Pavlovian conditioned approach task will be correlated with the first principal component of average parameter estimates from the following regions extracted for the cannabis vs. neutral contrast: ventral striatum, anterior cingulate, posterior cingulate, insula, amygdala, orbitofrontal cortex, inferior occipital cortex, and inferior parietal cortex
Sponsors and contacts
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University of Michigan
Lead sponsor
National Institute on Drug Abuse (NIDA)
Collaborator