TMS in Modulating Brain Reward Circuity

Wed, 22 Apr 2026 00:00:00 +0000

Project Overview

This project is a proof-of-concept study examining whether transcranial magnetic stimulation (TMS) can modulate neural responses underlying reward processing in individuals with problematic alcohol use. Specifically, the study investigates whether TMS can reduce the overvaluation of alcohol-related rewards while enhancing neural responses to alternative "natural" rewards, and whether such modulation translates into changes in craving and alcohol consumption behavior.

Background

Alcohol use disorder (AUD) is characterized by a maladaptive shift in reward processing, whereby alcohol-related cues acquire heightened motivational salience at the expense of non-drug rewards. This imbalance is reflected in neurophysiological markers, including increased brain responses to alcohol cues and diminished responses to natural rewards. Such reward dysregulation is strongly implicated in craving, compulsive use, and relapse.

Emerging evidence suggests that these neural biases are not fixed and may be reversible. Studies using neuroimaging and electrophysiology have shown normalization of reward-related brain responses following sustained abstinence. More recently, non-invasive brain stimulation techniques, such as TMS, have demonstrated the capacity to directly modulate these processes by altering activity in prefrontal–striatal circuits. This raises the possibility that TMS could serve as a translational intervention targeting core neurocognitive mechanisms of addiction.

Research Aims

Evaluate whether TMS can reverse biased neural responses to alcohol versus natural reward stimuli
Examine changes in electrophysiological markers of reward processing (P3 amplitude) following TMS
Assess whether TMS-induced neural modulation is associated with changes in craving
Determine whether these effects extend to behavioral indices of alcohol consumption in laboratory and real-world contexts

Methods

Experimental Paradigm

Passive image-viewing task with simultaneous EEG recording
Stimuli categories: alcohol-related, non-alcoholic beverages, neutral objects, and natural rewards
Behavioral ratings of stimulus valence (pleasant vs. neutral)
Pre- and post-TMS assessment of neural responses (P3 component)

TMS Protocol

Target region: left dorsolateral prefrontal cortex (DLPFC)
Excitatory stimulation (10 Hz) paired with natural reward stimuli
Inhibitory stimulation (1 Hz) paired with alcohol-related stimuli
Active vs. sham-controlled quasi-experimental design
Counterbalanced stimulation order across participants

Behavioral and Clinical Measures

Craving assessment using visual analogue scales
Alcohol Taste Task to measure implicit drinking motivation
Daily ecological monitoring of alcohol consumption

Sample and Design

Non-treatment-seeking individuals with problematic alcohol use
Inclusion based on drinking patterns and health criteria
Quasi-experimental, translational design bridging lab-based neuroscience and clinical relevance

Significance

This study targets a central mechanism in addiction—reward dysregulation—using a mechanistically informed neuromodulation approach. By directly testing whether TMS can recalibrate the balance between drug-related and non-drug rewards, the project advances a translational framework linking neural processes to behavior. If successful, the findings will provide preliminary evidence supporting TMS as a scalable and biologically grounded intervention for reducing craving and relapse risk in alcohol use disorder.

TMS | Neuro Adx Lab