Studying the factors of addiction

The Filbey lab focuses on combining neuroimaging and genetic techniques to characterize neural mechanisms associated with reward system dysfunction (e.g., addictive disorders). Specifically, the researchers are interested in how genetic and environmental factors, such as the age at which a person begins using a substance and early life stress, influence neural mechanisms associated with changes in the brain’s reward system – a network often implicated in addiction.

Ongoing projects involve the determination of these effects using neuroimaging tools (sMRI, DTI, fMRI during cue-exposure tasks, reward and punishment tasks, response inhibition tasks and stress tasks, resting state fMRI) and genetic studies in substance abusers, compulsive eaters and risk-taking individuals.

“I wanted to study the reward system in the brain because understanding how that system operates and changes will have wide implications for a number of problems such as obesity, pain management, and drug addiction,” Dr. Filbey said.

Marijuana addiction focus

The National Institute on Drug Abuse has awarded Dr. Filbey substantial grants to study how genetic and environmental factors predict or increase the chances of marijuana addiction.

“Despite the long history of cannabis use, we still know very little about its effects on the brain. It is the most widely used illegal substance in the United States, contributing to marijuana dependence being the most prevalent of all illicit drug dependencies,” Dr. Filbey said.

Study in progress

As part of the study, more than 100 research participants will undergo brain imaging while being presented with marijuana cues, such as paraphernalia, to examine the neural mechanisms of craving. Participants will also be psychologically evaluated so as to identify environmental stressors that are risk factors for marijuana dependence. Understanding these risk factors and the genetic makeup of those addicted to marijuana could lead to better therapies to treat and prevent addiction. Through Dr. Filbey’s team’s research, the hope is to characterize predictors of drug dependence that could then facilitate timely and efficacious prevention and treatment.

This innovative research seeks to illuminate how early life experiences can interact with and change an individual’s genetic makeup to produce brain changes that lead to marijuana dependence.