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Greg Hajcak, Ph.D

University of Delaware (2006)
Professor, Clinical


Office: Psychology B-224
Phone: (631) 632-7811

Anxiety Disorders Clinic

Research Interests:

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 shared first-author publication

denotes student or post-doc trainee author


Patrick, C.P., & Hajcak, G. (in press). RDoC: Translating promise into progress. Psychophysiology.

Horan, W.P., Wynn, J.K., Hajcak, G., Altshuler, L., & Green, M.F. (in press). Distinct Patterns of Dysfunctional Appetitive and Aversive Motivation in Bipolar Disorder Versus Schizophrenia: An Event Related Potential Study. Journal of Abnormal Psychology.

Patrick, C.P., & Hajcak, G. (in press). Reshaping Clinical Science: Introduction to the Special Issue on Psychophysiology and the NIMH Research Domain Criteria (RDoC) Initiative. Psychophysiology.

Meyer‡ , A., Bress‡ , J.N., Hajcak, G., & Gibb, B.E. (in press). Maternal History of Recurrent Depression is Related to Reduced Error-related Brain Activity. Journal of Clinical Child and Adolescent Psychology.

Kessel‡ , E.M., Meyer‡ , A., Hajcak, G., Dougherty, L.R., Torpey-Newman, D.C., Carlson, G.A., & Klein, D.N. (in press). Transdiagnostic Factors and Pathways to Multifinality: The Error-Related Negativity Distinguishes Developmental Trajectories from Preschool Irritability to Internalizing and Externalizing Symptoms at Age 9. Development and Psychopathology.

Jackson‡ , F., Nelson‡ , B.D., & Hajcak, G. (in press). The Uncertainty of Errors: Intolerance of Uncertainty is Associated with Error-Related Brain Activity. Biological Psychology.

Fitzgerald, J.M., MacNamara, A., DiGangi, J.A., Kennedy, A.E., Rabinak, C.A., Patwell, R., Greenstein, J.E., Proescher, E., Rauch, S.A.M., Hajcak, G., & Phan, K.L. (in press). An Electrocortical Investigation of Voluntary Emotion Regulation in Combat-Related Posttraumatic Stress Disorder. Psychiatry Research: Neuroimaging.

Chin‡ , B., Nelson‡ , B.D., Jackson‡ , F., & Hajcak, G. (in press). Intolerance of Uncertainty and Startle Potentiation in in Relation to Different Threat Reinforcement Rates. International Journal of Psychophysiology

Hajcak, G., & Patrick, C.P. (in press). Situating Psychophysiological Science within the Research Domain Criteria (RDoC) Framework. International Journal of Psychophysiology.

Nelson‡ , B. D., Kessel‡ , E. M., Jackson‡ , F., & Hajcak, G. (in press). The impact of an unpredictable context and intolerance of uncertainty on the electrocortical response to monetary gains and losses. Cognitive, Affective, & Behavioral Neuroscience

Kujawa‡ , A., Hajcak, G., Danzig, A.P., Black, S.R., Bromet, E.J., Carlson, G.A., Kotov, R., & Klein, D.N. (in press). Neural Reactivity to Emotional Stimuli Prospectively Predicts the Impact of a Natural Disaster on Psychiatric Symptoms in Children. Biological Psychiatry

Weinberg‡ , A., Perlman, G., Kotov, R., & Hajcak, G. (in press). Depression and reduced neural response to emotional images: Distinction from anxiety, and importance of symptom dimensions and age of onset. Journal of Abnormal Psychology.

MacNamara‡ , A., Kotov, R., & Hajcak, G. (in press). Diagnostic and symptom-based predictors of emotional processing in generalized anxiety disorder and major depressive disorder: An event-related potential study. Cognitive Therapy and Research.

Weinberg‡ , A., Meyer‡ , A., Hale-Rude‡ , E., Perlman, G., Kotov, R., Klein, D.N., & Hajcak, G. (in press) Error-related negativity and sustained threat: Conceptual framework and empirical evaluation in an adolescent sample. Psychophysiology.

Dunning‡ , J.P., & Hajcak, G. (in press) Gradients of fear potentiated startle during generalization, extinction, and extinction recall—and their relations with worry. Behavior Therapy.

Kessel‡, E.M., Dougherty, L., Kujawa‡, A.J., Hajcak, G., Carlson, G., & Klein, D.N. (in press). Longitudinal associations between preschool disruptive mood dysregulation disorder symptoms and neural reactivity to monetary reward during preadolescence. Journal of Child and Adolescent Psychopharmacology.

Pagliaccio, D., Luking‡ C., Hajcak, G., & Barch, D.M. (in press). Revising the BIS/BAS to study development: Measurement invariance and normative effects of age and sex from childhood through adulthood. Psychological Assessment. 

Sussman‡, T., Szekely‡, A., Hajcak, G., & Mohanty, A. (in press). It’s all in the anticipation: How perception of threat is enhanced in anxiety. Emotion.

Kessel‡, E.M., Kujawa‡, A.J., Proudfit, G.H., & Klein, D.N. (in press). Neural Sensitivity to Reward Differentiates Social from Generalized Anxiety in Children. Journal of Child Psychology and Psychiatry.

Kappenman, E.S., Macnamara, A., & Proudfit, G. H. (2015). Electrocortical evidence for rapid allocation of attention to threat in the dot-probe task.  Social, Cognitive, and Affective Neuroscience, 10(4), 577-583.
Kujawa, A.J., Glenn, C.R., Hajcak, G., & Klein, D.N. (2015). Affective modulation of the startle response among children at high and low risk for anxiety disorders.  Psychological Medicine, 45(12), 2647-2656.
Speed, B. C., Nelson, B. D., Perlman, G., Klein, D.N., Kotov, R., & Hajcak, G. (2015). Personality and emotional processing: A relationship between extraversion and the late positive potential in adolescence.  Psychophysiology, 52(8), 1039-1047.
Nelson, B.D., Perlman, G., Hajcak, G., Klein, D.N., & Kotov, R. (2015). Familial risk for distress and fear disorders and emotional reactivity in adolescence: An event-related potential investigation.  Psychological Medicine, 45(12), 2545-2556.
Nelson, B.,D., Hajcak, G., & Shankman, S.A. (2015). Event-related potentials to acoustic startle probes during anticipation of predictable and unpredictable threat.  Psychophysiology, 52(7), 887-894.
Proudfit, G.H., Bress, J.N., Foti, D., Kujawa, A., & Klein, D.N. (2015). Depression and event-related potentials: Emotional disengagement and reward insensitivity.  Current Opinion in Psychology, 4, 110-113.
Tabak, N.T., Green, M.F., Wynn, J.K., Proudfit, G.H., Altshuler, L., & Horan, W.P. (2015). Perceived emotional intelligence is impaired and associated with poor community functioning in schizophrenia and bipolar disorder.  Schizophrenia Research, 162(1-3), 189-195.
Kappenman, E.S., Farrens, J.L., Luck, S.J., & Proudfit, G.H. (2014). Behavioral and ERP measures of attentional bias to threat in the dot-probe task: Poor reliability and lack of a correlation with anxiety.  Frontiers in Psychology: Personality and Social Psychology, 5, 1368.
Auerbach, R.P., Stanton, C.H., Proudfit, G.H. & Pizzagalli, D.A. (2015). Self-referential processing in adolescent depression: A high-density ERP study. Journal of Abnormal Psychology, 124(2), 233-245.
Weinberg, A., Kotov, R., & Proudfit, G.H. (in press). Neural indicators of error processing in Generalized Anxiety Disorder, Obsessive-Compulsive Disorder, and Major Depressive Disorder. Journal of Abnormal Psychology.
Meyer, A., Proudfit, G.H., Bufferd, S.J., Kujawa, A.J., Laptook, R.S., Torpey, D.C., & Klein, D.N. (in press). Self-reported and observed punitive parenting prospectively predicts increased error-related negativity in six-year-old children. Journal of Abnormal Child Psychology.
Kujawa, A., Proudfit, G.H., Laptook, R., & Klein, D.N. (2015). Early Parenting Moderates the Association between Parental Depression and Neural Reactivity to Rewards and Losses in Offspring. Clinical Psychological Science, 3(4), 503-515.
Bress, J., Meyer, A., & Proudfit, G.H. (2015). The Stability of the Feedback Negativity and Its Relationship with Depression During Childhood and Adolescence. Development and Psychopathology, 27(4), 1285-1294. 
Nelson, B.D., Weinberg, A., Pawluk, J., Gawlowska, M., & Proudfit, G.H. (2015). An Event-related potential Investigation of Fear Generalization and Intolerance of Uncertainty.  Behavior Therapy, 46(5), 661-670.
Foti, D., Weinberg, A., Bernat, E., & Proudfit, G.H. (in press). Anterior cingulate activity to monetary loss and basal ganglia activity to monetary gain uniquely contribute to the feedback negativity. Clinical Neurophysiology.
Moholy, M., Prause, N., Proudfit, G.H., Rahman, A., & Fong, T., (2015). Sexual desire, not hypersexuality, predicts self-regulation of sexual arousal.  Cognition and Emotion, 29(8), 1505-1516.   
Proudfit, G.H. (2015). The reward positivity: From basic research on reward to a biomarker for depression. Psychophysiology, 52(4), 449-459.
Weinberg, A., Venables, N., Proudfit, G.H., & Patrick, C. (2015). Heritability of the neural response to emotional pictures: Evidence from ERPs in an adult twin sample.  Social, Cognitive, and Affective Neuroscience, 10(3), 424-434.
Jackson, F., Nelson, B., & Proudfit, G.H. (2015). In an uncertain world, errors are more aversive: Evidence from the error-related negativity. Emotion, 15(1), 12-16.
Kujawa, A., Proudfit, G.H., Dyson, M., Olino, T., & Klein, D.N. (2015). Neural reactivity to monetary rewards and losses in childhood: Longitudinal and concurrent associations with observed and self-reported positive emotionality.  Biological Psychology, 104, 41-47.
Parvaz, M.A., Konova, A.B., Dunning, J.P., Proudfit, G.H., Malaker, P., Moeller, S.J., Maloney, T., Woicik, P.A., Alia-Klein, N., Goldstein, R.Z. (2015). Impaired neural response to negative prediction errors in cocaine addiction. Journal of Neuroscience, 35(5), 1872-1879.
Gable, P.A., Adams, D.L., & Proudfit, G.H. (2015). Transient Tasks and Enduring Emotions: The Impact of Affective content, Task-Relevance, and Picture Duration on the Sustained Late Positive Potential. Cognitive, Affective, and Behavioral Neuroscience, 15, 45-54
Ferri, J., & Hajcak, G., (2015). Neural mechanisms associated with reappraisal and attentional deployment.  Current Opinion in Psychology, 3, 17-21.
Parvaz, M., Moeller, S.J., Goldstein, R.Z., & Proudfit, G.H. (2015). Electrocortical evidence of increased post-reappraisal neural reactivity and its link to depressive symptoms.  Social, Cognitive, and Affective Neuroscience, 10(1), 78-84.
Bress, J., Meyer, A., & Hajcak, G. (2015).  Differentiating anxiety and depression in children and adolescents: Evidence from event-related brain potentials. The Journal of Clinical Child and Adolescent Psychology, 44(2), 238-249.
Foti, D., Carlson, J.M., Sauder, C.L., & Proudfit, G.H. (2014). Reward dysfunction in major depression: Multimodal neuroimaging evidence for refining the melancholic phenotype. NeuroImage, 101, 50-58.
MacNamara, A., & Proudfit, G.H. (2014). Cognitive load and emotional processing in Generalized Anxiety Disorder: Electrocortical evidence for increased distractability. Journal of Abnormal Psychology, 123(3), 557-565.
Carlson, J.M., Cha, J., Harmon-Jones, E., Mujica-Parodi, L.R., & Hajcak, G. (2014). Influence of the BDNF genotype on amygdalo-prefrontal white matter microstructure is linked to nonconscious attention bias to threat. Cerebral Cortex, 24(9), 2249-2257.
Meyer, A., Bress, J., & Proudfit, G.H. (2014). Psychometric Properties of the Error-Related Negativity in Children and Adolescents. Psychophysiology, 51(7), 602-610. 
Jackson, F., Foti, D., Kotov, R., Perlman, G., Mathalon, D., & Proudfit, G.H. (2014). An incongruent reality: The N400 in relation to psychosis and recovery. Schizophrenia Research, 160, 208-215.
Kujawa, A., Arfer, K.B., Klein, D.N., & Proudfit, G.H. (2014). Electrocortical reactivity to social feedback in youth: A pilot study of the Island Getaway Task.  Developmental Cognitive Neuroscience, 10, 140-147.
Carlson, J.M., Foti, D., Harmon-Jones, E., & Proudfit, G.H. (2014). Midbrain volume predicts fMRI and ERP measures of reward reactivity. Brain Structure and Function.
Hilgard, J., Weinberg, A., Bartholow, B.D., & Proudfit, G.H. (2014). The Negativity bias in affective picture processing depends on top-down and bottom-up motivational significance. Emotion, 14(5), 940-949.  
Ferri, J., Bress, J.N., Eaton, N.R., & Proudfit, G.H. (2014). The impact of puberty and social anxiety on amygdala activation to faces in adolescence.  Developmental Neuroscience, 36(3-4), 239-249.
Kujawa, A., Proudfit, G.H. & Klein, D.N. (2014). Neural Reactivity to Rewards and Losses in Offspring of Mothers and Fathers with Histories of Depressive and Anxiety Disorders. Journal of Abnormal Psychology, 123(2), 287-297.
Tracy, J.L., Klonsky, E.D., & Proudfit, G.H. (2014). How affective science can inform clinical science: An introduction to the special issue.  Clinical Psychological Science, 2(4), 371-386. 
Weinberg, A., Riesel, & Proudfit, G.H. (2014). Show me the money: The impact of actual rewards and losses on the feedback negativity.  Brain and Cognition, 87, 134-139. 
Cha, J., Greenberg, T., Carlson, J., DeDora, D., Hajcak, G., & Mujica-Parodi, L. (2014). Circuit-wide structural and functional measures predict ventromedial prefrontal cortex fear generalization: Implications for generalized anxiety disorder. Journal of Neuroscience, 34(11), 4043-4053.
Cha, J., Greenberg, T., Carlson, J., DeDora, D., Hajcak, G., & Mujica-Parodi, L. (2014). Hyper-reactive human ventral tegmental area and aberrant mesocorticolimbic connectivity in overgeneralization of fear in generalized anxiety disorder. Journal of Neuroscience, 34(17), 5855-5860.
Nelson, B.D., Proudfit, G.H., & Shankman, S.A. (2014). Intolerance of uncertainty and reward anticipation in major depressive disorder. Journal of Affective Disorders, 158, 108-113. 
Schmidt, J., MacNamara, A., Proudfit, G.H., & Zelinsky, G.J. (2014). More target features in visual working memory leads to poorer search guidance: Evidence from Contralateral Delay Activity. Journal of Vision, 14(3), 1-19.
Proudfit, G.H., Dunning, J., Foti, D., & Weinberg, A.(2013) Temporal dynamics of emotion regulation. In J.J. Gross (Ed.), Handbook of Emotion Regulation (2nd Edition; pp. 43-57). New York: Guilford Publications.
Proudfit, G.H., Inzlicht, M., & Mennin, D. (2013). Anxiety and error monitoring: The importance of motivation and emotion. Frontiers in Human Neuroscience, 7, Article 636, 1-4.
Meyer, A., Hajcak, G., Torpey, D.C., Kujawa, A., Kim, J., Bufferd, S., Carlson, G., & Klein, D.N. (2013). Increased error-related brain activity in six- year-old children with clinical anxiety. Journal of Abnormal Child Psychology, 41, 1257-1266.
Meyer, A., Riesel, A., & Proudfit, G.H. (2013). Reliability of the ERN across multiple tasks as a function of increasing errors. Psychophysiology, 50(12), 1220-1225.
Foti, D., Kotov, R., & Hajcak, G. (2013). Psychometric considerations in using error-related brain activity as a biomarker in psychotic disorders.  Journal of Abnormal Psychology, 122(2), 520-531.
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.
Kujawa, A., Klein, D.N., & Proudfit, G.H. (2013). Two-year stability of the late positive potential across middle childhood and early adolescence. Biological Psychology, 94(2), 290-296.
Ferri, J., Schmidt, J., Hajcak, G., & Canli, T. (2013). Neural correlates of attentional deployment within unpleasant pictures. NeuroImage, 70, 268-277.
Bress, J., & Hajcak, G. (2013). Self-report and behavioral measures of reward sensitivity predict the feedback negativity. Psychophysiology, 50(7), 610-616.
Riesel, A., Weinberg, A., Endrass, T., Meyer, A., & Hajcak, G. (2013). Is the ERN, the ERN, the ERN? Convergent validity of error-related brain activity across different tasks.  Biological Psychology, 93(3), 377-385.
Sauder, C.L., Hajcak, G., Angstadt, M., & Phan, K.L. (2013). Test-Retest Reliability of Amygdala Response to Emotional Faces. Psychophysiology, 50(11), 1147-1156.
Torpey, D.C., Hajcak, G., Kim, J., Kujawa, A., Dyson, M.W., Olino, T.M., & Klein, D.N. (2013). Error-related brain activity in young children: Associations with parental anxiety and child temperamental negative emotionality.  Journal of Child Psychology and Psychiatry, 54(8), 854-862.
Horan, W.P., Hajcak, G., Wynn, J., & Green, M.F. (2013). Impaired emotion regulation in schizophrenia: Evidence from event-related potentials.  Psychological Medicine, 43(11), 2377-2391.
Rabinak, C.A., Angstadt, M., Kennedy, A.E., Hajcak, G., & Phan, K.L. (2013). Neural response to errors in combat-exposed returning veterans with and without posttraumatic stress disorder: A preliminary event-related potential study.  Psychiatry Research: Neuroimaging, 213(1), 71-78.
Wheaton, M.G., Holman, A., Rabinak, C.A., MacNamara, A., & Proudfit, G.H., & Phan, K.L. (2013). Danger and disease: Electrocortical responses to threat- and disgust-eliciting images.  International Journal of Psychophysiology, 90(2), 235-239.
Weinberg, A., Ferri, J., & Hajcak, G. (2013) Interactions between attention and emotion: Insights from the late positive potential. In M. Robinson, E. Watkins & E. Harmon-Jones (Eds.), Handbook of Cognition and Emotion. New York: Guilford Publications. pp. 35-54.

Hajcak, G., MacNamara, A., Foti, D., Ferri, J., & Keil, A. (2013). The dynamic allocation of attention to emotion: Simultaneous and independent evidence from the late positive potential and steady state visual evoked potentials. Biological Psychology, 92(3), 447-455.
Kujawa, A., Smith, E., Luhmann, C., & Hajcak, G. (2013). The feedback negativity reflects favorable compared to non-favorable outcomes based on global, not local, alternatives. Psychophysiology, 50, 134-138.
Greenberg, T., Carlson, J.M., Cha, J., Hajcak, G., & Mujica-Parodi, L.R. (2013). Neural reactivity tracks fear generalization gradients. Biological Psychology, 92(1), 2-8.
Dunning, J.P., DelDonno, S., & Hajcak, G. (2013). The Effects of contextual threat and anxiety on affective startle modulation. Biological Psychology, 94, 130-135.
Greenberg, T., Carlson, J.M., Cha, J., Hajcak, G., & Mujica-Parodi, L.R. (2013). Ventromedial prefrontal cortex reactivity is altered in generalized anxiety disorder during fear generalization. Depression and Anxiety, 30(3), 242-250.
Kujawa, A., Weinberg, A., Hajcak, G., & Klein, D.N. (2013). Differentiating event-
related potentials sensitive to emotion in middle childhood: Evidence from temporal-spatial PCA. Developmental Psychobiology, 55(5), 539-550.
Smith, E., Weinberg, A., Moran, T., & Hajcak, G. (2013). Electrocortical responses to NIMSTIM facial expressions of emotion. International Journal of Psychophysiology, 88(1), 17-25.
Riesel, A., Weinberg, A., Moran, T., & Hajcak, G. (2013). Time course of error-potentiated startle and its relationship to error-related brain activity. Journal of Psychophysiology, 27(2), 51-59.
Bismark, A.,W., Hajcak, G., Whitworth, N.M., & Allen, J.J.B. (2013). The role of outcome expectations in the generation of the feedback-related negativity. Psychophysiology, 50, 125-133.
Macnamara, A., Kappenman, E.S., Black, S.R., Bress, J. N., & Hajcak, G. (2013). Integrating behavioral and electrocortical measures of attentional bias toward threat. In K. C. Barrett, N. A. Fox, G. A. Morgan, D. J. Fidler & L. A. Daunhauer (Eds.), Handbook of self-regulatory processes in development (pp. 215-243). New York: Psychology Press.
Moskowitz, L., Mulder, E., Walsh, C., McLaughlin, D.M., Zarcone, J., Proudfit, G.H., & Carr, E.G. (2013). A Multimethod Assessment of Anxiety and Problem Behavior in Children with Autism Spectrum Disorders and Intellectual Disability. American Journal on Intellectual and Developmental Disabilities, 118(6), 419-434.
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.
Thiruchselvam, R., Hajcak, G., & Gross, J.J. (2012). Looking inwards: Shifting attention within working memory representations alters emotional responses. Psychological Science, 23(12), 1461-1466.
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.
Bress, J.N., Smith, E., Foti, D., Klein, D.N., & Hajcak, G., (2012). Neural response to reward and depressive symptoms in late childhood to early adolescence. Biological Psychology, 89, 156-162. 
MacNamara, A., Schmidt, J., Zelinsky, G., & Hajcak, G. (2012). Electrocortical and ocular indices of attention to fearful and neutral faces presented under high and low working memory load. Biological Psychology, 91(3), 349-356.
Foti, D. & Hajcak, G. (2012). Genetic variation in dopamine moderates neural response during reward anticipation and delivery: Evidence from event-related potentials. Psychophysiology, 49(5), 617-626.
Meyer, A., Weinberg, A., Klein, D.N., & Hajcak, G., (2012). The development of the error-related negativity (ERN) and its relationship with anxiety: Evidence from 8 to 13 year-olds. Developmental Cognitive Neuroscience, 2, 152-161.
Weinberg, A., Luhmann, C.C., Bress, J.N., & Hajcak, G. (2012). Better late than never? The effect of feedback delay on ERP indices of reward processing. Cognitive, Affective, and Behavioral Neuroscience, 12(4), 671-677.
Kujawa, K., Hajcak, G., Torpey, D.C., Kim, J., & Klein, D.N. (2012). Electrocortical reactivity to emotional faces in young children and associations with maternal and paternal depression. The Journal of Child Psychology and Psychiatry, 53(2), 207-215.
Parvaz, M.A., MacNamara, A., Goldstein, R.Z., & Hajcak, G. (2012). Event-related frontal alpha as a marker of lateral prefrontal activation during cognitive reappraisal. Cognitive, Affective, and Behavioral Neuroscience, 12, 730-740.
Moeller, S.J., Hajcak, G., Volkow, N.D., & Goldstein, R.Z. (2012). Psychophysiological prediction of choice: Relevance to insight and drug addiction. Brain, 135(11), 3481-3494.
Foti, D., Kotov, R., Klein, D.N., & Hajcak, G. (2012). Abnormal neural sensitivity to monetary gain versus loss among adolescents at risk for depression. Journal of Abnormal Child Psychology, 39(7), 913-924.
Kujawa, A., Klein, D. N., & Hajcak, G. (2012). Electrocortical reactivity to emotional images and faces from middle childhood to early adolescence. Developmental Cognitive Neuroscience, 2(4), 458-467.
Ferri, J., Weinberg, A., & Hajcak, G. (2012). I see people: The presence of human faces impacts the processing of complex emotional stimuli. Social Neuroscience, 7(4), 436-443. 
Meyer, A., Klein, D.N., Torpey, D.C., Kujawa, A.J.., Hayden, E.P., Sheikh, H.I., Singh, S.M., & Hajcak, G. (2012). Additive effects of the dopamine D2 receptor (DRD2) and dopamine transporter (DAT1) gene on the error-related negativity (ERN) in young children. Genes, Brain, and Behavior, 11(6), 695-703.
Glenn, C.R., Klein, D.N., Lissek, S., Britton, J.C., Pine, D.S., & Hajcak, G. (2012). The development of fear learning and generalization in 8 to 13 year-olds. Developmental Psychobiology, 54, 675-684.
Glenn, C.R., Lieberman, L., & Hajcak, G. (2012). Comparing Electrical Shock and a Screaming Fearful Face as Unconditioned Stimuli for Fear Learning. International Journal of Psychophysiology, 86, 214-219.
Weinberg, A., Riesel, A., & Hajcak, G. (2012). Integrating multiple perspectives on error-related brain activity: the ERN as a neural indicator of trait defensive reactivity. Motivation and Emotion, 36, 84-100.
Horan, W.P., Foti, D., Hajcak, G., Wynn, J.K., & Green, M.F. (2012). Intact motivated attention in Schizophrenia: Evidence from event-related potentials. Schizophrenia Research, 135(1-3), 95-99. 
Horan, W.P., Foti, D., Hajcak, G., Wynn, J.K., & Green, M.F. (2012). Impaired neural response to internal but not external feedback in Schizophrenia. Psychological Medicine, 42(8), 1637-1647. 
Weinberg, A., Hilgard, J., Bartholow, B., & Hajcak, G. (2012). Emotional targets: Evaluative categorization as a function of context and content. International Journal of Psychophysiology, 84(2), 149-154.
Torpey, D.C., Hajcak, G., Kim, J., Kujawa, A., & Klein, D.N. (2012). Electrocortical and behavioral measures of response monitoring in young children during a Go/No-go task.  Developmental Psychobiology, 54(2), 139-150.
Rubin, D., Botanov, Y., Hajcak, G., & Mujica-Parodi, L.R. (2012) Second-hand stress: Inhalation of stress sweat enhances neural response to neutral faces. Social, Cognitive, and Affective Neuroscience, 7(2), 208-212.
Carlson, J.M., Beacher, F. Reinke, K., Haibb, R., Harmon-Jones, E.,  Mujica-Parodi, L.R., & Hajcak, G. (2012). Nonconscious attention bias to threat is correlated with anterior cingulate cortex gray matter volume: A voxel-based morphometry result and replication. NeuroImage, 59, 1713-1718.
de Rover, M., Brown, S.B.R., Boot, N., Hajcak, G., van Noorden, M.S., van der Wee, N.J.A., & Nieuwenhuis, S.N. (2012). Beta receptor-mediated modulation of the late positive potential. Psychopharmacology, 219, 971-979.
Olvet, D.M., & Hajcak, G. (2012). The error-related negativity (ERN) relates to sadness following mood induction among individuals with high neuroticism. Social Cognitive and Affective Neuroscience, 7(3), 289-295.
Wu, L., Winkler, M.H., Andreatta, M., Hajcak, G., Pauli, P. (2012). Appraisal frames of pleasant and unpleasant pictures alter emotional responses as reflected in self-report and facial electromyographic activity. International Journal of Psychophysiology, 85(2), 224-229.
Carlson, J.M., Mujica-Parodi, L.R., Harmon-Jones, E. & Hajcak, G. (2012). The orienting of spatial attention to backward masked fearful faces is associated with variation in the serotonin transporter gene. Emotion, 12(2), 203-207.
Davila, J., & Hajcak, G. (2012). From fractionation to integration: Problems and possible alternatives for clinical science training. The Behavior Therapist, 35(1), 1-4.
Foti, D., Weinberg, A., Dien, J., & Hajcak, G. (2011). Event-related potential activity in the basal ganglia differentiates rewards from non-rewards:  Temporospatial principal components analysis and source localization of the Feedback Negativity. Human Brain Mapping, 32(12), 2207-2216.
Foti, D., Weinberg, A., Dien, J., & Hajcak, G. (2011). Event-related potential activity in the basal ganglia differentiates rewards from non-rewards: Response to commentary.  Human Brain Mapping, 32(12), 2267-2269.
Weinberg, A., & Hajcak, G. (2011). The late positive potential predicts subsequent interference with target processing.  Journal of Cognitive Neuroscience, 23(10), 2994-3007. 
Carlson, J.M., Foti, D., Mujica-Parodi, L.R., Harmon-Jones, E. & Hajcak, G. (2011). Ventral striatal and medial prefrontal BOLD activation is correlated with reward-related electrocortical activity: A combined ERP and fMRI study. NeuroImage, 57, 1608-1616.
Weinberg, A., & Hajcak, G. (2011). Electrocortical evidence for vigilance then avoidance in Generalized Anxiety Disorder: An event-related potential study. Psychophysiology, 48(6), 842-851.
MacNamara, A., Ferri, J., & Hajcak, G. (2011). Working memory load reduces the late positive potential and this effect is attenuated with increasing anxiety.  Cognitive, Affective, and Behavioral Neuroscience, 11(3), 321-331. 
Weinberg, A., & Hajcak, G. (2011). Longer-term test-retest reliability of error-related brain activity. Psychophysiology, 48(10), 1420-1425.
Kujawa, A.J., Torpey, D., Kim, J., Hajcak, G., Rose, S., Gotlib, I., & Klein, D.N. (2011).  Attentional Biases for Emotional Faces in Young Children of Mothers with Chronic or Recurrent Depression. Journal of Abnormal Child Psychology, 39, 125-135.
Glenn, C.R., Blumenthal, T.D., Klonsky, E.D., & Hajcak, G. (2011). Emotional reactivity in nonsuicidal self-injury: Divergence between self-report and startle measures. International Journal of Psychophysiology, 80,166- 170. 
Dunning, J.P, Hajcak, G., Parvaz, M.A., Maloney, T., Alia-Klein, N., Woicik, P.A., Telang, F., Wang, G.-J., Volkow, N.D., & Goldstein, R.Z. (2011).  Motivated Attention to Cocaine and Emotional Cues in Abstinent and Current Cocaine Users: An ERP Study. European Journal of Neuroscience, 33(9), 1716-1723.
Luhmann, C.C., Ishida, K., & Hajcak, G. (2011). Intolerance of uncertainty and decisions about delayed, probabilistic rewards. Behavior Therapy, 42(3), 378-386.
MacNamara, A., Ochsner, K.N. & Hajcak, G. (2011).  Previously reappraised: the lasting effect of description type on picture-elicited electrocortical activity.  Social, Cognitive, and Affective Neuroscience, 6(3), 348-358.
Wheatley, T., Weinberg, A., Looser, C., Moran, T., & Hajcak, G. (2011). Mind perception: Real but not artificial faces sustain neural activity beyond the N170/VPP. PLoS ONE, 6(3), e17960.
Grasso, D.J., Cohen, L.H., Moser, J.S., Hajcak, G., Foa, E.B., & Simons, R.F. (2011). Seeing the silver lining: Potential benefits of trauma-exposure in college students. Anxiety, Stress, & Coping, 18, 1-20.
Weinberg, A., & Hajcak, G. (2010). Increased error-related brain activity in Generalized Anxiety Disorder. Biological Psychology, 85, 472-480.
Olvet, D.M., Hatchwell, E., & Hajcak, G. (2010). Lack of association between  5-HTT genetic polymorphisms and error-related brain activity. Biological Psychology, 85, 504-508.
Weinberg, A., & Hajcak, G. (2010). Beyond good and evil: Implications of examining electrocortical activity elicited by specific picture content. Emotion, 10(6), 767-782.
Hajcak, G., Anderson, B., Arana, A., Borckardt, J., Takacs, I., George, M.S., & Nahas,  Z. (2010). Dorsolateral prefrontal cortex stimulation modulates electrocortical measures of visual attention:  Evidence from direct bilateral epidural cortical stimulation in treatment-resistant mood disorder. Neuroscience, 170, 281-288.
Olvet, D.M., Klein, D.N., & Hajcak, G. (2010). Depression symptom severity and error-related brain activity. Psychiatry Research, 179, 30-37.
Foti, D., Olvet, D.M., Klein, D.N., & Hajcak, G. (2010). Reduced electrocortical response to threatening faces in major depressive disorder. Depression and Anxiety, 27, 813-820.
MacNamara, A., & Hajcak, G. (2010).  Distinct electrocortical and behavioral evidence for increased attention to threat in Generalized Anxiety Disorder. Depression and Anxiety, 27, 234-243.
Hajcak, G., MacNamara, A., & Olvet, D.M.(2010). Event-related potentials, emotion, and emotion regulation: An integrative review.  Developmental Neuropsychology, 35, 129-155.
Blechert, J., Feige, B., Hajcak, G., & Tuschen-Caffier B (2010).  To eat or not to eat: Availability of food modulates the electrocortical response to food pictures in restrained eaters. Appetite, 54, 262-268.
Foti, D., & Hajcak, G. (2010). State sadness reduces neural sensitivity to non-rewards versus rewards. Neuroreport,21, 143-147.
Dunning, J.P, Auiemmo, A., Castille, C., & Hajcak, G. (2010).  In the face of anger: Startle modulation to graded facial expressions. Psychophysiology, 47, 874-878.
van Loon, A.M.., van den Wildenberg, W.P.M., van Stegeren, A.H., Hajcak, G., &  Ridderinkhof, K.R. (2010). Emotional 
stimuli modulate readiness for action: A transcranial magnetic stimulation study.  Cognitive, Affective, and Behavioral Neuroscience,
10, 174-181.

Current Research Support:

2015-2018 National Institute of Mental Health (3R01; MH098454-S1)
A Randomized Controlled Trial of PCIT-ED for Preschool Depression
Co-I (PIs: Joan Luby and Deanna Barch); Total costs: $1,000,000

2014-2019 National Institute of Mental Health (2R01; MH069942)
Temperamental emotionality in preschoolers and depression risk
Co-I (PI: Daniel N. Klein); Total costs: $3,000,000

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

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