research topics

Anorexia Nervosa

Individuals with anorexia nervosa suffer from anxiety, reduced pleasure from normally rewarding situations, and disturbed body image. Neuroimaging studies demonstrate disturbances in reward circuits in response to food and body-related stimuli and monetary rewards, but results are inconsistent. To understand associated neural activity and physiological responses, we are investigating a fundamental process of the overall reward response - how one’s brain learns to associate stimuli with the experience of reward.

Body Dysmorphic Disorder

Individuals with body dysmorphic disorder (BDD) misperceive specific aspects of their appearance to be conspicuously flawed or defective, despite these being unnoticeable or appearing miniscule to others. They typically have poor insight or delusional beliefs, obsessive thoughts and compulsive behaviours, anxiety, and depression. We examine inter-relationships between neural systems, global/local visual perceptual processing, eye gaze behaviours, and emotional arousal in BDD population.

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Obsessive-Compulsive Disorder

Obsessive-compulsive disorder (OCD) is characterized by recurrent intrusive thoughts, urges, or images and repetitive physical or mental behaviours. Neuroimaging has played an important part in advancing our understanding of the neurobiology of OCD. At the same time, neuroimaging studies of OCD have had notable limitations, including reliance on relatively small samples. We are developing a circuit-based approach to different cognitive and clinical dimensions of OCD that can help transform how OCD and related mental disorders are conceptualized, diagnosed, and ultimately treated around the world.

Somatomap

We are creating a novel, visual-based digital tool, to measure, understand, and quantify individuals’ experiences of their bodies. This tool – “Somatomap” – is an advancement over self-report questionnaires to capture visual representations of internalized body image, cross-sectionally and dynamically over time. It provides a unique means to measure own-body perceptual accuracy. Understanding differences in perceptual accuracy and what factors contribute to this may help predict what treatments will be effective and what new treatments may be necessary.

We are enrolling participants for our research studies!

We are looking for participants with the following conditions:

Anorexia Nervosa

Appetitive conditioning in anorexia nervosa: neural, physiological, and behavioral mechanisms.

The purpose of this study is to identify whether individuals with AN can learn positive (reward-based) associations, how these associations diminish, and their relationships to heart rate, pupil responses, and brain activation. The study will also investigate the extent to which this positive association is reactivated after 24 hours, and the extent to which a memory prompt will help reinstate this previously learned association. The results from this study will provide a better understanding of the processes of reward learning in individuals with AN. This will inform the development of novel treatments that could increase incentives for pursuing rewarding social and food consumption-related experiences, and counteract fear of weight gain, which are fundamental to recovery.

Email: anorexia.research@camh.ca

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Body Dysmorphic Disorder

Neural mechanisms of perceptual abnormalities and their malleability in body dysmorphic disorder.

One of the main symptoms of body dysmorphic disorder (BDD) is a distorted perception of one's appearance. This causes emotional distress, can contribute to poor insight about the cause of one's problems, limits engagement in mental health treatment, and puts individuals at risk for relapse. The results from this study will help us understand how the brains of people with BDD, in combination with their behavior and their emotions, contribute to abnormal visual perceptual processing. Importantly, it will also help us understand if techniques to modify visual processing can change perception. This will lay the groundwork for next-step clinical studies to test new treatments that involve perceptual retraining.

Email: bdd.research@camh.ca

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Body Dysmorphic Disorder TMS

Exogenous Modulation of Visual Perception and Connectivity in Body Dysmorphic Disorder.

One of the main symptoms of body dysmorphic disorder (BDD) is a distorted perception of one's appearance. This causes emotional distress, can contribute to poor insight about the cause of one's problems, limits engagement in mental health treatment, and puts individuals at risk for relapse. This study aims to understand the effects of noninvasive brain stimulation in combination with a behavioral visual modulation technique on brain function and visual perception. This is an important step toward developing new treatment components for BDD.

Email: bdd.empac@camh.ca

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Obsessive Compulsive Disorder

Investigating the brain endocannabinoid system in obsessive-compulsive disorder.

Researchers at CAMH are conducting a PET (positron emission tomography) imaging research study to learn more about individuals with obsessive-compulsive disorder (OCD)..

Email: pet.ocd@camh.ca

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Team

Dr. Jamie Feusner

Principal Investigator

Dr. Feusner came to the University of Toronto in July 2021. He was previously a Professor of Psychiatry and Biobehavioral Sciences at UCLA, where he was on faculty from 2006-2021 and was the Director of the UCLA Eating Disorders and Body Dysmorphic Disorder Research Program and the Director of the UCLA Adult OCD Program. Dr. Feusner's clinical areas of specialty are body dysmorphic disorder (BDD), obsessive-compulsive disorder, eating disorders, and anxiety disorders. Dr. Feusner has taught cognitive-behavioural therapy and pharmacotherapy to psychiatry residents and other mental health providers, and provides research supervision and mentorship to junior faculty, postdoctoral fellows, neuroscience Ph.D. students, psychology Ph.D. students, master's students, undergraduates, and high school students.