Greg Hajcak Proudfit, Ph.D.
(Please note: I got married and changed my last name to "Proudfit"; "Hajcak" is now my middle name.)
University of Delaware (2006)
Associate Professor, Clinical
Office: Psychology B-146
Office Hours: Flexible, by appointment
Phone Number: (631) 632-6272
Research Website:
Director, Anxiety Disorders Clinic: Anxiety Disorders Clinic

Areas of Interest:
Psychophysiological approaches to studying emotion and cognition; anxiety disorders and their treatment.

Current Research:
My work utilizes a range of psychophysiological and neurobiological measures (i.e., event-related brain potentials or ERPs, functional magnetic resonance imagining or fMRI, startle reflex, pupillometry, eye tracking, heart rate, and skin conductance) to understand cognition, emotion, and psychopathology. Some of my work is basic in nature – intending to clarify the measurement and key mechanisms of emotion-cognition interactions. As a clinical psychophysiologist, I leverage these neurobiological and psychophysiological measures to better understand individual differences in anxiety, depression, and psychosis in terms of abnormal affective-cognitive processes. Because neurobiological and psychophysiological measures are often understood in terms of ‘biomarkers’ of disease-related processes, I am increasingly examining the psychometric properties of these measures. In my research on adult psychopathology, I am particularly interested in whether neural measures respect diagnostic boundaries versus cut across disorders—and how these data could inform nosology and etiological models of psychopathology and comorbidity. The major thrust of my current research program is on prediction: To what degree can neuroscience and psychophysiology predict changes in symptoms over time? What measures do best for specific symptoms (i.e., anxiety vs. depression)? To address these questions, the bulk of my current and future work is developmental in nature, and focuses on trajectories of emotion-cognition interactions and risk for psychopathology. I am particularly interested in how pubertal changes during adolescence relate to the sharp increase in both internalizing and externalizing symptoms. The long-term goal of this work is to evaluate and validate measures that could be used to identify higher-risk individuals in the real world—work that would inform both pathophysiological models of development and prevention efforts. Please see my laboratory website for more information.

Representative Publications:

‡denotes student-author

Foti‡, D., Kotov, R., & Hajcak, G. (in press). Psychometric considerations in using error-related brain activity as a biomarker in psychotic disorders. Journal of Abnormal Psychology.

Hajcak, G., Dunning, J., Foti, D., & Weinberg, A. (in press) Temporal dynamics of emotion regulation. In J. Gross (Ed.), Handbook of Emotion Regulation (2nd Edition). New York: Guilford Publications.

Meyer‡, A., Hajcak, G., Torpey, D.C., Kujawa‡, A., Kim‡, J., Bufferd, S., Carlson, G., & Klein, D.N. (in press). Increased error-related brain activity in six- year-old children with clinical anxiety. Journal of Abnormal Child Psychology.

Bress‡, J.N., Foti‡, D., Kotov, R., Klein, D.N., & Hajcak, G. (2013). Blunted neural response to rewards prospectively predicts depression in adolescent girls. Psychophysiology, 50, 74-81.

Ferri‡, J., Schmidt‡, J., Hajcak, G., & Canli, T. (2013). Neural correlates of attentional deployment within unpleasant pictures. NeuroImage, 70, 268-277.

Hajcak, G. (2012). What we’ve learned from our mistakes: Insights from error-related brain activity. Current Directions in Psychological Science, 21(2), 101-106.

Foti‡, D., Kotov, R., Bromet, E., & Hajcak, G. (2012). Beyond the broken error-related negativity: Functional and diagnostic correlates of error processing in psychosis. Biological Psychiatry, 71, 864-872.

Weinberg‡, A., Klein, D.N., & Hajcak, G. (2012). Increased error-related brain activity distinguishes Generalized Anxiety Disorder with and without comorbid Major Depressive Disorder. Journal of Abnormal Psychology, 121(4), 885-896.

Riesel‡, A., Weinberg‡, A., Endrass, T. Kathmann, N., & Hajcak, G. (2012). Punishment has a lasting impact on error-related brain activity. Psychophysiology, 49(2), 239-247.

Hajcak, G., Weinberg‡, A., MacNamara‡, A., & Foti‡, D. (2012). ERPs and the Study of Emotion. In S. J. Luck & E. S. Kappenman (Eds.), Oxford Handbook of ERP Components. New York: Oxford University Press, pp. 441-474.

Current Research Support:

2012-2017 National Institute of Mental Health (R01 MH097767)
Trajectories of Reward Sensitivity and Depression across Adolescence
PI; Total costs: $1,950,000

2011-2013 National Institute of Mental Health (R03 MH094518)
Reward-related Brain Activity: Biomarker for Risk of Depression in Childhood
PI; Total costs: $150,000

2008-2013 National Institute of Mental Health (R25; RMH084769)
Curriculum for Clinical and Research Training in Exposure Treatment for Anxiety
PI; Total costs: $161,000

2010-2014 National Institute of Mental Health (R01; MH069942)
Temperamental emotionality in preschoolers and depression risk
Co-I (PI: Daniel N. Klein); Total costs: $1,686,130

2012-2017 National Institute of Mental Health (R01; MH093479)
Personality Development and Vulnerability to First-episode Depression
Co-I (PI: Roman Kotov); Total costs: $2,778,000

2012-2016 National Institute of Mental Health (R01; MH098060)
Children’s Attentional Biases: A Key Component of Negative Valence Systems
Co-I (PI: Brandon Gibb); Total costs: $2,950,000

2011-2014 National Institute of Mental Health (R01; MH094398)
Trajectories of recovery from psychosis over two decades
Co-I (PI: Roman Kotov); Total costs: $1,967,000

2012-2017 National Institute of Mental Health (R25; MH080794)
Yearly Workshop in the Event-Related Potential Technique
Consultant (PI: Steve Luck); Direct costs: $163,000/year

2011-2014 National Institute of Mental Health (R21; MH091468)
Affective Neuroscience of Schizophrenia and Bipolar Disorder
Consultant (PI: William Horan); Total costs: $322,775

2012-2014 National Institute of Mental Health (R21; MH094545)
Temporal Dynamics and Neural Bases of Emotion Regulation Under Emotional Load
Consultant (PI: James Gross); Total costs: $434,000