Advances in cognitive and affective neuroscience allow us to conceptualize and measure functional neural systems that are related to core dimensions of psychopathology. These distinct neural systems bridge behavior and neurobiology and shed new light on the pathophysiology of mental disorders in a manner that may both clarify and cut across traditional diagnostic boundaries. Much of the preceding research on the pathophysiology of psychotic disorders has followed the categorical distinction between schizophrenia (SZ) and Bipolar Disorder (BD). However, recent genetic, clinical and outcome data suggest significant overlap between the disorders that could reflect shared pathophysiological processes. Hence there is a fundamental need to examine more basic mechanisms driving symptoms that underlie psychopathology in both disorders, as well as to understand points of divergence between SZ and BD. This need is especially salient in the context of first episode (FE) psychosis, where differential diagnosis is highly challenging and the benefits of targeted early treatments are most pronounced. Toward this aim, this proposal focuses on cognitive control and approach motivation in FE psychosis, two core dimensions recommended by RDoC and linked respectively to fronto-parietal (FP) and orbitalfrontal-ventral striatal (OFC-VS) functional brain networks. Using fMRI and two behavioral paradigms that engage 1) the goal maintenance component of cognitive control 2) positive incentive effects on behavior and 3) the effects of repeated incentives on cognitive control, in a prospective longitudinal design we will test the following hypotheses regarding the cognitive and neural mechanisms underlying core behavioral disturbances in SZ and BD. 1) FP dysfunction is related across diagnoses to impaired cognitive control and disorganization, and that in SZ this is a trait feature of the illness while in BD it is largely episode dependant 2) OFC-VS activity in response to positive incentives is reduced in SZ and intact or increased in BD and this is a trait feature o both illnesses and 3) BD patient have a unique pattern of responding to repeated incentives with increased OFC-VS and decreased FP activity and impaired cognitive control, as a trait feature of the illness. Successful completion of this project will provide important links between discrete neural circuits and core symptoms in SZ and BD and highlight areas of overlap as well as divergence in the illness. The results will provide important circuitry level insights into the natral history and pathophysiology of FE psychosis, contribute to the development of imaging biomarkers and help guide the development of interventions that focus on key dimensions of symptoms in FE psychosis.

Public Health Relevance

This project has high relevance for public health by providing new insights into the cognitive and neural mechanisms underlying disabling symptoms in schizophrenia and bipolar disorder. The results of this research will inform more targeted and effective treatment development and lead to the development of imaging biomarkers to enhance earlier identification and more effective early intervention for these common, severe mental disorders.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH059883-11
Application #
8656433
Study Section
Neural Basis of Psychopathology, Addictions and Sleep Disorders Study Section (NPAS)
Program Officer
Rumsey, Judith M
Project Start
2000-03-15
Project End
2018-03-31
Budget Start
2014-07-10
Budget End
2015-03-31
Support Year
11
Fiscal Year
2014
Total Cost
$523,881
Indirect Cost
$168,105
Name
University of California Davis
Department
Neurosciences
Type
Schools of Medicine
DUNS #
047120084
City
Davis
State
CA
Country
United States
Zip Code
95618
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Minzenberg, Michael J; Yoon, Jong H; Cheng, Yaoan et al. (2014) Modafinil effects on middle-frequency oscillatory power during rule selection in schizophrenia. Neuropsychopharmacology 39:3018-26
Fassbender, Catherine; Scangos, Katie; Lesh, Tyler A et al. (2014) RT distributional analysis of cognitive-control-related brain activity in first-episode schizophrenia. Cogn Affect Behav Neurosci 14:175-88
Minzenberg, Michael J; Gomes, Glenn C; Yoon, Jong H et al. (2014) Disrupted action monitoring in recent-onset psychosis patients with schizophrenia and bipolar disorder. Psychiatry Res 221:114-21
Minzenberg, Michael J; Lesh, Tyler A; Niendam, Tara A et al. (2014) Frontal cortex control dysfunction related to long-term suicide risk in recent-onset schizophrenia. Schizophr Res 157:19-25
Mote, Jasmine; Minzenberg, Michael J; Carter, C S et al. (2014) Deficits in anticipatory but not consummatory pleasure in people with recent-onset schizophrenia spectrum disorders. Schizophr Res 159:76-9
Owoso, A; Carter, C S; Gold, J M et al. (2013) Cognition in schizophrenia and schizo-affective disorder: impairments that are more similar than different. Psychol Med 43:2535-45
Fulford, Daniel; Niendam, Tara A; Floyd, Erin G et al. (2013) Symptom dimensions and functional impairment in early psychosis: more to the story than just negative symptoms. Schizophr Res 147:125-31
Yoon, Jong H; Nguyen, Danh V; McVay, Lindsey M et al. (2012) Automated classification of fMRI during cognitive control identifies more severely disorganized subjects with schizophrenia. Schizophr Res 135:28-33

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