1
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Treutlein J, Löhlein S, Einenkel KE, Picotin R, Diekhof EK, Gruber O. Association of Unc-51-like Kinase 4 ( ULK4) with the reactivity of the extended reward system in response to conditioned stimuli. World J Biol Psychiatry 2024:1-8. [PMID: 39185807 DOI: 10.1080/15622975.2024.2393381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 08/05/2024] [Accepted: 08/13/2024] [Indexed: 08/27/2024]
Abstract
OBJECTIVES ULK4 is an established candidate gene for mental disorders and antipsychotic treatment response. We investigated the association of functional genetic variation at the ULK4 locus with the human extended dopaminergic reward system using fMRI during the performance of a well-established reward paradigm. METHODS Two hundred and thirty-four patients were included in this study. Association of genetic variation in the ULK4 gene with reward system functioning were determined using the Desire-Reason-Dilemma (DRD) paradigm which allows to assess brain activation in response to conditioned reward stimuli. RESULTS Variant prioritisation revealed the strongest functional signatures for the ULK4 variant rs17215589, coding for amino acid exchange Ala715Thr. For rs17215589 minor allele carriers, we detected increased activation responses to conditioned reward stimuli in the ventral tegmental area, nucleus accumbens and several cortical brain regions of the extended reward system. CONCLUSIONS Our findings provide further evidence in humans that genetic variation in ULK4 may increase the vulnerability to mental disorders, by modulating the extended reward system function. Future studies are needed to confirm the modulation of the extended reward system by ULK4 and to specify the role of this mechanism in the pathogenesis of psychiatric disorders.
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Affiliation(s)
- Jens Treutlein
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Simone Löhlein
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
- Institute of Flight Systems, University of the Bundeswehr Munich, Munich, Germany
| | - Karolin E Einenkel
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Rosanne Picotin
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Esther K Diekhof
- Institute for Cell- and Systemsbiology of Animals, Department of Biology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
- Department of Psychiatry and Psychotherapy, Center for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University Göttingen, Göttingen, Germany
| | - Oliver Gruber
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
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2
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Martín-Pérez C, Vergara-Moragues E, Fernández-Muñoz JJ, García-González JM, García-Moreno LM. Reward sensitivity and hazardous alcohol consumption in women: The parallel mediation effect of self-control and impulsivity traits. Subst Abus 2022; 43:1333-1340. [PMID: 36036761 DOI: 10.1080/08897077.2021.1941522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
Introduction: Little research has been carried out on the associations between several individual factors and hazardous alcohol use in women. The aim of this study was first, to study the relationship between reward sensitivity (RS) and alcohol use in both women with and without hazardous drinking separately. Second, to explore the potential mediating roles of the impulsivity and self-control traits in this relationship. Method: The study was analytical and cross-sectional and included 645 female participants (mean age = 19.14; standard deviation (SD)=1.60). All women were divided into two groups (286, 44.3%, with hazardous drinking, HDW; and 359, 55.7%, with light drinking, LDW). Correlation analyses were carried out to explore the associations between the variables, and parallel mediation analyses were performed to investigate the potential mediating roles of impulsivity and self-control in the RS-alcohol use associations in each group separately. Results: A significant association was observed between RS and alcohol use in HDW, contrary to that observed in their counterparts. In addition, both higher impulsivity and less self-control mediated the association between RS and alcohol use only in HDW. Conclusions: Impulsivity and self-control differently affect alcohol use under the condition of high reward sensitivity, only in HDW, suggesting alterations of the dual top-down and bottom-up mechanisms and a possible imbalance between the competing reflexive and impulsive brain systems. More research is needed regarding the individual factors that affect women's drinking to develop sensitive measures for the assessment of alcohol use and more efficient interventions for women.
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Affiliation(s)
- Cristina Martín-Pérez
- Department of Psychobiology and Methodology in Behavioral Sciences, Universidad Complutense de Madrid (UCM), Madrid, Spain.,Faculty of Education, Universidad Internacional de la Rioja (UNIR), Logroño, Spain
| | - Esperanza Vergara-Moragues
- Department of Psychobiology and Methodology in Behavioral Sciences, Universidad Complutense de Madrid (UCM), Madrid, Spain
| | - Juan José Fernández-Muñoz
- Area of Methodology of Behavioral Sciences. Faculty of Health Sciences, Rey Juan Carlos University, Madrid, Spain
| | | | - Luis Miguel García-Moreno
- Department of Psychobiology and Methodology in Behavioral Sciences, Universidad Complutense de Madrid (UCM), Madrid, Spain
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3
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Chaari N, Gharsallaoui MA, Akdağ HC, Rekik I. Multigraph classification using learnable integration network with application to gender fingerprinting. Neural Netw 2022; 151:250-263. [PMID: 35447482 DOI: 10.1016/j.neunet.2022.03.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/10/2022] [Accepted: 03/28/2022] [Indexed: 01/27/2023]
Abstract
Multigraphs with heterogeneous views present one of the most challenging obstacles to classification tasks due to their complexity. Several works based on feature selection have been recently proposed to disentangle the problem of multigraph heterogeneity. However, such techniques have major drawbacks. First, the bulk of such works lies in the vectorization and the flattening operations, failing to preserve and exploit the rich topological properties of the multigraph. Second, they learn the classification process in a dichotomized manner where the cascaded learning steps are pieced in together independently. Hence, such architectures are inherently agnostic to the cumulative estimation error from step to step. To overcome these drawbacks, we introduce MICNet (multigraph integration and classifier network), the first end-to-end graph neural network based model for multigraph classification. First, we learn a single-view graph representation of a heterogeneous multigraph using a GNN based integration model. The integration process in our model helps tease apart the heterogeneity across the different views of the multigraph by generating a subject-specific graph template while preserving its geometrical and topological properties conserving the node-wise information while reducing the size of the graph (i.e., number of views). Second, we classify each integrated template using a geometric deep learning block which enables us to grasp the salient graph features. We train, in end-to-end fashion, these two blocks using a single objective function to optimize the classification performance. We evaluate our MICNet in gender classification using brain multigraphs derived from different cortical measures. We demonstrate that our MICNet significantly outperformed its variants thereby showing its great potential in multigraph classification.
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Affiliation(s)
- Nada Chaari
- BASIRA Lab, Faculty of Computer and Informatics, Istanbul Technical University, Istanbul, Turkey; Faculty of Management, Istanbul Technical University, Istanbul, Turkey
| | - Mohammed Amine Gharsallaoui
- BASIRA Lab, Faculty of Computer and Informatics, Istanbul Technical University, Istanbul, Turkey; Ecole Polytechnique de Tunisie (EPT), Tunis, Tunisia
| | | | - Islem Rekik
- BASIRA Lab, Faculty of Computer and Informatics, Istanbul Technical University, Istanbul, Turkey; School of Science and Engineering, Computing, University of Dundee, UK.
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4
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Vogelbacher C, Sommer J, Schuster V, Bopp MHA, Falkenberg I, Ritter PS, Bermpohl F, Hindi Attar C, Rauer L, Einenkel KE, Treutlein J, Gruber O, Juckel G, Flasbeck V, Mulert C, Hautzinger M, Pfennig A, Matura S, Reif A, Grotegerd D, Dannlowski U, Kircher T, Bauer M, Jansen A. The German research consortium for the study of bipolar disorder (BipoLife): a magnetic resonance imaging study protocol. Int J Bipolar Disord 2021; 9:37. [PMID: 34786613 PMCID: PMC8595454 DOI: 10.1186/s40345-021-00240-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 10/05/2021] [Indexed: 11/21/2022] Open
Abstract
Background Bipolar disorder is one of the most severe mental disorders. Its chronic course is associated with high rates of morbidity and mortality, a high risk of suicide and poor social and occupational outcomes. Despite the great advances over the last decades in understanding mental disorders, the mechanisms underlying bipolar disorder at the neural network level still remain elusive. This has severe consequences for clinical practice, for instance by inadequate diagnoses or delayed treatments. The German research consortium BipoLife aims to shed light on the mechanisms underlying bipolar disorders. It was established in 2015 and incorporates ten university hospitals across Germany. Its research projects focus in particular on individuals at high risk of bipolar disorder, young patients in the early stages of the disease and patients with an unstable highly relapsing course and/or with acute suicidal ideation. Methods Functional and structural magnetic resonance imaging (MRI) data was acquired across nine sites within three different studies. Obtaining neuroimaging data in a multicenter setting requires among others the harmonization of the acquisition protocol, the standardization of paradigms and the implementation of regular quality control procedures. The present article outlines the MRI imaging protocols, the acquisition parameters, the imaging paradigms, the neuroimaging quality assessment procedures and the number of recruited subjects. Discussion The careful implementation of a MRI study protocol as well as the adherence to well-defined quality assessment procedures is one key benchmark in the evaluation of the overall quality of large-scale multicenter imaging studies. This article contributes to the BipoLife project by outlining the rationale and the design of the MRI study protocol. It helps to set the necessary standards for follow-up analyses and provides the technical details for an in-depth understanding of follow-up publications. Supplementary Information The online version contains supplementary material available at 10.1186/s40345-021-00240-6.
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Affiliation(s)
- Christoph Vogelbacher
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany. .,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany.
| | - Jens Sommer
- Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany.,Core-Facility Brainimaging, Faculty of Medicine, University Marburg, Marburg, Germany
| | - Verena Schuster
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany.,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany
| | - Miriam H A Bopp
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany.,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany.,Department of Neurosurgery, University Marburg, Marburg, Germany
| | - Irina Falkenberg
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany.,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany
| | - Philipp S Ritter
- Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Felix Bermpohl
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychiatry and Psychotherapy, Charité at St. Hedwig-Krankenhaus, Berlin, Germany
| | - Catherine Hindi Attar
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychiatry and Psychotherapy, Charité at St. Hedwig-Krankenhaus, Berlin, Germany
| | - Lisa Rauer
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Karolin E Einenkel
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Jens Treutlein
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Oliver Gruber
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Georg Juckel
- Department of Psychiatry, Psychotherapy and Preventive Medicine, LWL University Hospital, Ruhr University Bochum, Bochum, Germany
| | - Vera Flasbeck
- Department of Psychiatry, Psychotherapy and Preventive Medicine, LWL University Hospital, Ruhr University Bochum, Bochum, Germany
| | - Christoph Mulert
- Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany.,Center of Psychiatry, Justus-Liebig University, Giessen, Germany.,Giessen Graduate School for Life Sciences, Justus-Liebig University, Giessen, Germany
| | - Martin Hautzinger
- Department of Psychology Clinical Psychology and Psychotherapy, Eberhard Karls University, Tübingen, Germany
| | - Andrea Pfennig
- Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Silke Matura
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Frankfurt, Germany
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Frankfurt, Germany
| | | | - Udo Dannlowski
- Department of Psychiatry, University of Münster, Münster, Germany
| | - Tilo Kircher
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany.,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany
| | - Michael Bauer
- Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Andreas Jansen
- Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf-Bultmann-Straße 8, 35039, Marburg, Germany.,Center for Mind, Brain, and Behavior (CMBB), Universities of Marburg and Gießen, Marburg, Germany.,Core-Facility Brainimaging, Faculty of Medicine, University Marburg, Marburg, Germany
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5
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Striatal Dopamine Transporter Availability Is Not Associated with Food Craving in Lean and Obese Humans; a Molecular Imaging Study. Brain Sci 2021; 11:brainsci11111428. [PMID: 34827426 PMCID: PMC8615750 DOI: 10.3390/brainsci11111428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/22/2021] [Accepted: 10/26/2021] [Indexed: 11/17/2022] Open
Abstract
Brain dopamine signaling is essential for the motivation to eat, and obesity is associated with altered dopaminergic signaling and increased food craving. We used molecular neuroimaging to explore whether striatal dopamine transporter (DAT) availability is associated with craving as measured with the General Food Craving Questionnaire-Trait (G-FCQ-T). We here show that humans with obesity (n = 34) experienced significantly more craving for food compared with lean subjects (n = 32), but food craving did not correlate significantly with striatal DAT availability as assessed with 123I-FP-CIT single-photon emission computed tomography. We conclude that food craving is increased in obesity, but the scores for food craving are not related to changes in striatal DAT availability.
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6
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Chai Y, Chimelis-Santiago JR, Bixler KA, Aalsma M, Yu M, Hulvershorn LA. Sex-specific frontal-striatal connectivity differences among adolescents with externalizing disorders. NEUROIMAGE-CLINICAL 2021; 32:102789. [PMID: 34469847 PMCID: PMC8405840 DOI: 10.1016/j.nicl.2021.102789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 08/08/2021] [Accepted: 08/10/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Sex-specific neurobiological underpinnings of impulsivity in youth with externalizing disorders have not been well studied. The only report of functional connectivity (FC) findings in this area demonstrated sex differences in fronto-subcortical connectivity in youth with attention-deficit/hyperactivity disorder (ADHD). METHODS The current study used functional magnetic resonance imaging(fMRI) to examine sex differences in resting-state seed-based FC, self-rated impulsivity, and their interactions in 11-12-year-old boys (n = 43) and girls (n = 43) with externalizing disorders. Generalized linear models controlling for pubertal development were used. Seeds were chosen in the ventral striatum, medial prefrontal cortex, middle frontal gyrus and amygdala. RESULTS Impulsivity scores were greater in boys than girls (p < 0.05). Boys showed greater positive connectivity within a ventromedial prefrontal-ventral striatal network. In addition, boys demonstrated weaker connectivity than girls within two medial-lateral prefrontal cortical networks. However, only boys showed greater medial-lateral prefrontal connectivity correlated with greater impulsivity. CONCLUSIONS The findings provide evidence supporting sex differences in both ventral striatal-ventromedial prefrontal and medial-lateral prefrontal functional networks in youth with externalizing disorders. These important networks are thought to be implicated in impulse control. Medial-lateral prefrontal connectivity may represent a male-specific biomarker of impulsivity.
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Affiliation(s)
- Ya Chai
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Kristy A Bixler
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Matthew Aalsma
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Meichen Yu
- Indiana Alzheimer Disease Research Center, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA; Indiana University Network Science Institute, Bloomington, IN, USA
| | - Leslie A Hulvershorn
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA.
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7
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Diekhof EK, Richter A, Brodmann K, Gruber O. Dopamine multilocus genetic profiles predict sex differences in reactivity of the human reward system. Brain Struct Funct 2021; 226:1099-1114. [PMID: 33580321 DOI: 10.1007/s00429-021-02227-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 01/21/2021] [Indexed: 11/30/2022]
Abstract
Sex differences in the neural processing of decision-making are of high interest as they may have pronounced effects on reward- and addiction-related processes. In these, the neurotransmitter dopamine plays a central role by modulating the responsiveness of the reward circuitry. The present functional magnetic resonance imaging study aimed to explore sex and dopamine transmission interactions in decision-making. 172 subjects (111 women) performed a behavioral self-control task assessing reward-related activation during acceptance and rejection of conditioned rewards. Participants were genotyped for six key genetic polymorphisms in the dopamine system that have previously been associated with individual differences in reward sensitivity or dopaminergic transmission in the human striatum, such as rs7118900 (dopamine receptor D2 (DRD2) Taq1A), rs1554929 (DRD2 C957T), rs907094 (DARPP-32), rs12364283 (DRD2), rs6278 (DRD2), and rs107656 (DRD2). The selected polymorphisms were combined in a so-called multilocus genetic composite (MGC) score reflecting the additive effect of different alleles conferring relative increased dopamine transmission in every individual. We successfully demonstrated that reward-related activation in the ventral striatum and ventral tegmental area (VTA) was significantly modulated by biologically informed MGC profiles and sex. When comparing men and women with low MGC profiles that may indicate lower dopamine transmission, only women displayed a reduced down-regulation of activation in the mesolimbic system during reward rejection and additionally, a significant non-linear u-shape relationship between MGC score and VTA activation. Taken together, by integrating neuroimaging and genetics, the present findings contribute to a better understanding of the effects of sex differences on the human brain.
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Affiliation(s)
- Esther K Diekhof
- Section for Neuroendocrinology, Department of Biology, University of Hamburg, Hamburg, Germany.,Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen, Göttingen, Germany
| | - Anja Richter
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University Hospital, Heidelberg, Germany. .,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, 16 De Crespigny Park, London, SE5 8AF, UK.
| | - Katja Brodmann
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen, Göttingen, Germany
| | - Oliver Gruber
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen, Göttingen, Germany.,Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University Hospital, Heidelberg, Germany
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8
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Sex and strain differences in dynamic and static properties of the mesolimbic dopamine system. Neuropsychopharmacology 2020; 45:2079-2086. [PMID: 32663840 PMCID: PMC7547712 DOI: 10.1038/s41386-020-0765-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 07/04/2020] [Accepted: 07/08/2020] [Indexed: 02/02/2023]
Abstract
Sex is a biological variable that contributes to the incidence, clinical course, and treatment outcome of brain disorders. Chief among these are disorders associated with the dopamine system. These include Parkinson's disease, ADHD, schizophrenia, and mood disorders, which show stark differences in prevalence and outcome between men and women. In order to reveal the influence of biological sex as a risk factor in these disorders, there is a critical need to collect fundamental information about basic properties of the dopamine system in males and females. In Long Evans rats, we measured dynamic and static properties related to the mesolimbic dopamine system. Static measures included assessing ventral tegmental area (VTA) dopamine cell number and volume and expression of tyrosine hydroxylase and dopamine transporter. Dynamic measures in behaving animals included assessing (1) VTA neuronal encoding during learning of a cue-action-reward instrumental task and (2) dopamine release in the nucleus accumbens in response to electrical stimulation of the VTA, vesicular depletion of dopamine, and amphetamine. We found little or no sex difference in these measures, suggesting sexual congruency in fundamental static and dynamic properties of dopamine neurons. Thus, dopamine related sex-differences are likely mediated by secondary mechanisms that flexibly influence the function of the dopamine cells and circuits. Finally, we noted that most behavioral sex differences had been reported in Sprague-Dawley rats and repeated some of the above measures in that strain. We found some sex differences in those animals highlighting the importance of considering strain differences in experimental design and result interpretation.
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9
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Warthen KG, Boyse-Peacor A, Jones KG, Sanford B, Love TM, Mickey BJ. Sex differences in the human reward system: convergent behavioral, autonomic and neural evidence. Soc Cogn Affect Neurosci 2020; 15:789-801. [PMID: 32734300 PMCID: PMC7511890 DOI: 10.1093/scan/nsaa104] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 06/23/2020] [Accepted: 07/11/2020] [Indexed: 11/16/2022] Open
Abstract
Several studies have suggested that females and males differ in reward behaviors and their underlying neural circuitry. Whether human sex differences extend across neural and behavioral levels for both rewards and punishments remains unclear. We studied a community sample of 221 young women and men who performed a monetary incentive task known to engage the mesoaccumbal pathway and salience network. Both stimulus salience (behavioral relevance) and valence (win vs loss) varied during the task. In response to high- vs low-salience stimuli presented during the monetary incentive task, men showed greater subjective arousal ratings, behavioral accuracy and skin conductance responses (P < 0.006, Hedges' effect size g = 0.38 to 0.46). In a subsample studied with functional magnetic resonance imaging (n = 44), men exhibited greater responsiveness to stimulus salience in the nucleus accumbens, midbrain, anterior insula and dorsal anterior cingulate cortex (P < 0.02, g = 0.86 to 1.7). Behavioral, autonomic and neural sensitivity to the valence of stimuli did not differ by sex, indicating that responses to rewards vs punishments were similar in women and men. These results reveal novel and robust sex differences in reward- and punishment-related traits, behavior, autonomic activity and neural responses. These convergent results suggest a neurobehavioral basis for sexual dimorphism observed in the reward system, including reward-related disorders.
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Affiliation(s)
| | | | - Keith G Jones
- Department of Psychiatry, University of Utah, Salt Lake City, UT 84108, USA
| | - Benjamin Sanford
- Department of Psychiatry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Tiffany M Love
- Department of Psychiatry, University of Utah, Salt Lake City, UT 84108, USA
| | - Brian J Mickey
- Department of Psychiatry, University of Utah, Salt Lake City, UT 84108, USA
- Department of Psychiatry, University of Michigan, Ann Arbor, MI 48109, USA
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10
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Ross JA, Van Bockstaele EJ. The role of catecholamines in modulating responses to stress: Sex-specific patterns, implications, and therapeutic potential for post-traumatic stress disorder and opiate withdrawal. Eur J Neurosci 2020; 52:2429-2465. [PMID: 32125035 DOI: 10.1111/ejn.14714] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 01/15/2020] [Accepted: 02/20/2020] [Indexed: 12/22/2022]
Abstract
Emotional arousal is one of several factors that determine the strength of a memory and how efficiently it may be retrieved. The systems at play are multifaceted; on one hand, the dopaminergic mesocorticolimbic system evaluates the rewarding or reinforcing potential of a stimulus, while on the other, the noradrenergic stress response system evaluates the risk of threat, commanding attention, and engaging emotional and physical behavioral responses. Sex-specific patterns in the anatomy and function of the arousal system suggest that sexually divergent therapeutic approaches may be advantageous for neurological disorders involving arousal, learning, and memory. From the lens of the triple network model of psychopathology, we argue that post-traumatic stress disorder and opiate substance use disorder arise from maladaptive learning responses that are perpetuated by hyperarousal of the salience network. We present evidence that catecholamine-modulated learning and stress-responsive circuitry exerts substantial influence over the salience network and its dysfunction in stress-related psychiatric disorders, and between the sexes. We discuss the therapeutic potential of targeting the endogenous cannabinoid system; a ubiquitous neuromodulator that influences learning, memory, and responsivity to stress by influencing catecholamine, excitatory, and inhibitory synaptic transmission. Relevant preclinical data in male and female rodents are integrated with clinical data in men and women in an effort to understand how ideal treatment modalities between the sexes may be different.
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Affiliation(s)
- Jennifer A Ross
- Department of Pharmacology and Physiology, College of Medicine, Drexel University, Philadelphia, PA, USA
| | - Elisabeth J Van Bockstaele
- Department of Pharmacology and Physiology, College of Medicine, Drexel University, Philadelphia, PA, USA
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11
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Brandl F, Le Houcq Corbi Z, Mulej Bratec S, Sorg C. Cognitive reward control recruits medial and lateral frontal cortices, which are also involved in cognitive emotion regulation: A coordinate-based meta-analysis of fMRI studies. Neuroimage 2019; 200:659-673. [DOI: 10.1016/j.neuroimage.2019.07.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 03/04/2019] [Accepted: 07/04/2019] [Indexed: 02/04/2023] Open
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12
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Fradkin Y, Khadka S, Bessette KL, Stevens MC. The relationship of impulsivity and cortical thickness in depressed and non-depressed adolescents. Brain Imaging Behav 2018; 11:1515-1525. [PMID: 27738995 DOI: 10.1007/s11682-016-9612-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Major Depressive Disorder (MDD) is recognized to be heterogeneous in terms of brain structure abnormality findings across studies, which might reflect previously unstudied traits that confer variability to neuroimaging measurements. The purpose of this study was to examine the relationships between different types of trait impulsivity and MDD diagnosis on adolescent brain structure. We predicted that adolescents with depression who were high on trait impulsivity would have more abnormal cortical structure than depressed patients or non-MDD who were low on impulsivity. We recruited 58 subjects, including 29 adolescents (ages 12-19) with a primary DSM-IV diagnosis of MDD and a history of suicide attempt and 29 demographically-matched healthy control participants. Our GLM-based analyses sought to describe differences in the linear relationships between cortical thickness and impulsivity trait levels. As hypothesized, we found significant moderation effects in rostral middle frontal gyrus and right paracentral lobule cortical thickness for different subscales of the Barratt Impulsiveness Scale. However, although these brain-behavior relationships differed between diagnostic study groups, they were not simple additive effects as we had predicted. For the middle frontal gyrus, non-MDD participants showed a strong positive association between cortical thickness and BIS-11 Motor scores, while MDD-diagnosed participants showed a negative association. For Non-Planning Impulsiveness, paracentral lobule cortical thickness was observed with greater impulsivity in MDD, but no association was found for controls. In conclusion, the findings confirm that dimensions of impulsivity have discrete neural correlates, and show that relationships between impulsivity and brain structure are expressed differently in adolescents with MDD compared to non-MDD.
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Affiliation(s)
- Yuli Fradkin
- Department of Psychiatry, Rutgers University Robert Wood Johnson Medical School, 675 Hoes Ln W, Piscataway, NJ, 08854, USA
| | - Sabin Khadka
- Olin Neuropsychiatry Research Center, Hartford Hospital / The Institute of Living, 200 Retreat Avenue, Whitehall Building, Hartford, CT, 06106, USA
| | - Katie L Bessette
- Olin Neuropsychiatry Research Center, Hartford Hospital / The Institute of Living, 200 Retreat Avenue, Whitehall Building, Hartford, CT, 06106, USA
| | - Michael C Stevens
- Olin Neuropsychiatry Research Center, Hartford Hospital / The Institute of Living, 200 Retreat Avenue, Whitehall Building, Hartford, CT, 06106, USA. .,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA.
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13
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Goya-Maldonado R, Keil M, Brodmann K, Gruber O. Reactivity of the Reward System in Artists During Acceptance and Rejection of Monetary Rewards. CREATIVITY RESEARCH JOURNAL 2018. [DOI: 10.1080/10400419.2018.1414994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
| | | | - Katja Brodmann
- University Medical Center Göttingen
- Universidade de Lisboa
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14
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Jakob K, Ehrentreich H, Holtfrerich SKC, Reimers L, Diekhof EK. DAT1-Genotype and Menstrual Cycle, but Not Hormonal Contraception, Modulate Reinforcement Learning: Preliminary Evidence. Front Endocrinol (Lausanne) 2018; 9:60. [PMID: 29541062 PMCID: PMC5835510 DOI: 10.3389/fendo.2018.00060] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Hormone by genotype interactions have been widely ignored by cognitive neuroscience. Yet, the dependence of cognitive performance on both baseline dopamine (DA) and current 17ß-estradiol (E2) level argues for their combined effect also in the context of reinforcement learning. Here, we assessed how the interaction between the natural rise of E2 in the late follicular phase (FP) and the 40 base-pair variable number tandem repeat polymorphism of the dopamine transporter (DAT1) affects reinforcement learning capacity. 30 women with a regular menstrual cycle performed a probabilistic feedback learning task twice during the early and late FP. In addition, 39 women, who took hormonal contraceptives (HC) to suppress natural ovulation, were tested during the "pill break" and the intake phase of HC. The present data show that DAT1-genotype may interact with transient hormonal state, but only in women with a natural menstrual cycle. We found that carriers of the 9-repeat allele (9RP) experienced a significant decrease in the ability to avoid punishment from early to late FP. Neither homozygote subjects of the 10RP allele, nor subjects from the HC group showed a change in behavior between phases. These data are consistent with neurobiological studies that found that rising E2 may reverse DA transporter function and could enhance DA efflux, which would in turn reduce punishment sensitivity particularly in subjects with a higher transporter density to begin with. Taken together, the present results, although based on a small sample, add to the growing understanding of the complex interplay between different physiological modulators of dopaminergic transmission. They may not only point out the necessity to control for hormonal state in behavioral genetic research, but may offer new starting points for studies in clinical settings.
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Affiliation(s)
- Kristina Jakob
- Department of Biology, Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
| | - Hanna Ehrentreich
- Department of Biology, Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
| | - Sarah K. C. Holtfrerich
- Department of Biology, Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
| | - Luise Reimers
- Department of Biology, Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
| | - Esther K. Diekhof
- Department of Biology, Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Neuroendocrinology Unit, Universität Hamburg, Hamburg, Germany
- *Correspondence: Esther K. Diekhof,
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15
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Richter A, Gruber O. Influence of ventral tegmental area input on cortico-subcortical networks underlying action control and decision making. Hum Brain Mapp 2017; 39:1004-1014. [PMID: 29165901 DOI: 10.1002/hbm.23899] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 10/24/2017] [Accepted: 11/14/2017] [Indexed: 11/11/2022] Open
Abstract
It is argued that the mesolimbic system has a more general function in processing all salient events, including and extending beyond rewards. Saliency was defined as an event that is unexpected due to its frequency of occurrence and elicits an attentional-behavioral switch. Using functional magnetic resonance imaging (fMRI), signals were measured in response to the modulation of salience of rewarding and nonrewarding events during a reward-based decision making task, the so called desire-reason dilemma paradigm (DRD). Replicating previous findings, both frequent and infrequent, and therefore salient, reward stimuli elicited reliable activation of the ventral tegmental area (VTA) and ventral striatum (vStr). When immediate reward desiring contradicted the superordinate task-goal, we found an increased activation of the VTA and vStr when the salient reward stimuli were presented compared to the nonsalient reward stimuli, indicating a boosting of activation in these brain regions. Furthermore, we found a significantly increased functional connectivity between the VTA and vStr, confirming the boosting of vStr activation via VTA input. Moreover, saliency per se without a reward association led to an increased activation of brain regions in the mesolimbic reward system as well as the orbitofrontal cortex (OFC), inferior frontal gyrus (IFG), and anterior cingulate cortex (ACC). Finally, findings uncovered multiple increased functional interactions between cortical saliency-processing brain areas and the VTA and vStr underlying detection and processing of salient events and adaptive decision making.
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Affiliation(s)
- Anja Richter
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, University Hospital Heidelberg, 69115, Germany.,Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
| | - Oliver Gruber
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, University Hospital Heidelberg, 69115, Germany.,Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
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16
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Cannabis and cocaine decrease cognitive impulse control and functional corticostriatal connectivity in drug users with low activity DBH genotypes. Brain Imaging Behav 2017; 10:1254-1263. [PMID: 26667034 PMCID: PMC5167221 DOI: 10.1007/s11682-015-9488-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The dopamine β-hydroxylase (DβH) enzyme transforms dopamine into noradrenaline. We hypothesized that individuals with low activity DBH genotypes (rs1611115 CT/TT) are more sensitive to the influence of cannabis and cocaine on cognitive impulse control and functional connectivity in the limbic ‘reward’ circuit because they experience a drug induced hyperdopaminergic state compared to individuals with high activity DBH genotypes (rs1611115 CC). Regular drug users (N = 122) received acute doses of cannabis (450 μg/kg THC), cocaine HCl 300 mg and placebo. Cognitive impulse control was assessed by means of the Matching Familiar Figures Test (MFFT). Resting state fMRI was measured in a subset of participants to determine functional connectivity between the nucleus accumbens (NAc) and (sub)cortical areas. The influence of cannabis and cocaine on impulsivity and functional connectivity significantly interacted with DBH genotype. Both drugs increased cognitive impulsivity in participants with CT/TT genotypes but not in CC participants. Both drugs also reduced functional connectivity between the NAc and the limbic lobe, prefrontal cortex, striatum and thalamus and primarily in individuals with CT/TT genotypes. Correlational analysis indicated a significant negative association between cognitive impulsivity and functional connectivity in subcortical areas of the brain. It is concluded that interference of cannabis and cocaine with cognitive impulse control and functional corticostriatal connectivity depends on DBH genotype. The present data provide a neural substrate and behavioral mechanism by which drug users can progress to drug seeking and may also offer a rationale for targeted pharmacotherapy in chronic drug users with high risk DBH genotypes.
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17
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Vincent CM, Hall PA. Cognitive effects of a 30-min aerobic exercise bout on adults with overweight/obesity and type 2 diabetes. Obes Sci Pract 2017; 3:289-297. [PMID: 29071105 PMCID: PMC5598020 DOI: 10.1002/osp4.112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 03/27/2017] [Accepted: 04/27/2017] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Several studies document reliable brain health benefits of acute exercise bouts. However, no prior studies have explored such effects among those living with co-morbid overweight/obesity and type 2 diabetes (T2DM), both of which are conditions associated with cognitive performance decrements. PURPOSE To examine the impact of a 30-min bout of moderate-intensity aerobic exercise on executive function among adults with overweight/obesity and T2DM, employing a widely used experimental paradigm. METHODS Thirty adults with overweight/obesity and T2DM were randomly assigned to moderate (30% maximal heart rate reserve) and minimal (r.p.m. 30-50; work load 5) intensity aerobic exercise. Pre-exercise to post-exercise changes in Stroop interference and Go/No-Go scores were compared across conditions. RESULTS Primary analyses revealed no overall effect of exercise condition on changes in Stroop or Go/No-Go performance. Post-hoc moderation analyses indicated that Stroop interference scores were reduced, following moderate exercise among female participants and among those who were more physically active. CONCLUSION The current study revealed no reliable benefit of acute aerobic exercise for overweight and obese individuals living with T2DM overall. There may be limited benefits for women and more and active subgroups, but the precise nature of such benefits remains unclear.
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Affiliation(s)
- C. M. Vincent
- Department of MedicineUniversity of TorontoTorontoCanada
| | - P. A. Hall
- School of Public Health and Health SystemsUniversity of WaterlooWaterlooCanada
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18
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Pavăl D, Rad F, Rusu R, Niculae AŞ, Colosi HA, Dobrescu I, Dronca E. Low Retinal Dehydrogenase 1 (RALDH1) Level in Prepubertal Boys with Autism Spectrum Disorder: A Possible Link to Dopamine Dysfunction? CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE 2017; 15:229-236. [PMID: 28783931 PMCID: PMC5565080 DOI: 10.9758/cpn.2017.15.3.229] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 08/23/2016] [Accepted: 09/05/2016] [Indexed: 11/18/2022]
Abstract
Objective Retinal dehydrogenase 1 (RALDH1) is a cytosolic enzyme which acts both as a source of retinoic acid (RA) and as a detoxification enzyme. RALDH1 has key functions in the midbrain dopaminergic system, which influences motivation, cognition, and social behavior. Since dopamine has been increasingly linked to autism spectrum disorder (ASD), we asked whether RALDH1 could contribute to the autistic phenotype. Therefore, we investigated for the first time the levels of RALDH1 in autistic patients. To further assess the detoxification function of RALDH1, we also explored 4-hydroxynonenal protein adducts (4-HNE PAs) and reduced glutathione (GSH) levels. Moreover, considering the effect of testosterone on RALDH1 expression, we measured the second to fourth digit ratio (2D:4D ratio) for both hands, which reflects exposure to prenatal testosterone. Methods Male patients with ASD (n=18; age, 62.9±4.3 months) and healthy controls (n=13; age, 78.1±4.9 months) were examined. Erythrocyte RALDH1, serum 4-HNE PAs and erythrocyte GSH levels were measured using colorimetric assays, and digit lengths were measured using digital calipers. Results We found significantly lower (−42.9%) RALDH1 levels in autistic patients as compared to controls (p=0.032). However, there was no difference in 4-HNE PAs levels (p=0.368), GSH levels (p=0.586), or 2D:4D ratios (p=0.246 in the left hand, p=0.584 in the right hand) between healthy controls and autistic subjects. Conclusion We concluded that a subset of autistic patients had a low RALDH1 level. These results suggest that low RALDH1 levels could contribute to the autistic phenotype by reflecting a dopaminergic dysfunction.
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Affiliation(s)
- Denis Pavăl
- Department of Molecular Sciences, Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Florina Rad
- Alexandru Obregia Psychiatry Hospital, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Răzvan Rusu
- Department of Molecular Sciences, Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Alexandru-Ştefan Niculae
- Department of Molecular Sciences, Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Horaţiu Alexandru Colosi
- Department of Medical Informatics and Biostatistics, Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Iuliana Dobrescu
- Alexandru Obregia Psychiatry Hospital, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Eleonora Dronca
- Department of Molecular Sciences, Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
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19
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Abstract
Mental disorders are among the greatest medical and social challenges facing us. They can occur at all stages of life and are among the most important commonly occurring diseases. In Germany 28 % of the population suffer from a mental disorder every year, while the lifetime risk of suffering from a mental disorder is almost 50 %. Mental disorders cause great suffering for those affected and their social network. Quantitatively speaking, they can be considered to be among those diseases creating the greatest burden for society due to reduced productivity, absence from work and premature retirement. The Federal Ministry of Education and Research is funding a new research network from 2015 to 2019 with up to 35 million euros to investigate mental disorders in order to devise and develop better therapeutic measures and strategies for this population by means of basic and translational clinical research. This is the result of a competitive call for research proposals entitled research network for mental diseases. It is a nationwide network of nine consortia with up to ten psychiatric and clinical psychology partner institutions from largely university-based research facilities for adults and/or children and adolescents. Furthermore, three cross-consortia platform projects will seek to identify shared causes of diseases and new diagnostic modalities for anxiety disorders, attention deficit hyperactivity disorders (ADHS), autism, bipolar disorders, depression, schizophrenia and psychotic disorders as well as substance-related and addictive disorders. The spectrum of therapeutic approaches to be examined ranges from innovative pharmacological and psychotherapeutic treatment to novel brain stimulation procedures. In light of the enormous burden such diseases represent for society as a whole, a sustainable improvement in the financial support for those researching mental disorders seems essential. This network aims to become a nucleus for long overdue and sustained support for a German center for mental disorders.
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20
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Schreiter S, Spengler S, Willert A, Mohnke S, Herold D, Erk S, Romanczuk-Seiferth N, Quinlivan E, Hindi-Attar C, Banzhaf C, Wackerhagen C, Romund L, Garbusow M, Stamm T, Heinz A, Walter H, Bermpohl F. Neural alterations of fronto-striatal circuitry during reward anticipation in euthymic bipolar disorder. Psychol Med 2016; 46:3187-3198. [PMID: 27573157 DOI: 10.1017/s0033291716001963] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Bipolar disorder (BD), with the hallmark symptoms of elevated and depressed mood, is thought to be characterized by underlying alterations in reward-processing networks. However, to date the neural circuitry underlying abnormal responses during reward processing in BD remains largely unexplored. The aim of this study was to investigate whether euthymic BD is characterized by aberrant ventral striatal (VS) activation patterns and altered connectivity with the prefrontal cortex in response to monetary gains and losses. METHOD During functional magnetic resonance imaging 20 euthymic BD patients and 20 age-, gender- and intelligence quotient-matched healthy controls completed a monetary incentive delay paradigm, to examine neural processing of reward and loss anticipation. A priori defined regions of interest (ROIs) included the VS and the anterior prefrontal cortex (aPFC). Psychophysiological interactions (PPIs) between these ROIs were estimated and tested for group differences for reward and loss anticipation separately. RESULTS BD participants, relative to healthy controls, displayed decreased activation selectively in the left and right VS during anticipation of reward, but not during loss anticipation. PPI analyses showed decreased functional connectivity between the left VS and aPFC in BD patients compared with healthy controls during reward anticipation. CONCLUSIONS This is the first study showing decreased VS activity and aberrant connectivity in the reward-processing circuitry in euthymic, medicated BD patients during reward anticipation. Our findings contrast with research supporting a reward hypersensitivity model of BD, and add to the body of literature suggesting that blunted activation of reward processing circuits may be a vulnerability factor for mood disorders.
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Affiliation(s)
- S Schreiter
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - S Spengler
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - A Willert
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - S Mohnke
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - D Herold
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - S Erk
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - N Romanczuk-Seiferth
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - E Quinlivan
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - C Hindi-Attar
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - C Banzhaf
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - C Wackerhagen
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - L Romund
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - M Garbusow
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - T Stamm
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - A Heinz
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - H Walter
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
| | - F Bermpohl
- Department of Psychiatry and Psychotherapy,Charité - Universitätsmedizin Berlin,Campus Mitte,Germany
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21
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Niculae AŞ, Pavăl D. From molecules to behavior: An integrative theory of autism spectrum disorder. Med Hypotheses 2016; 97:74-84. [PMID: 27876135 DOI: 10.1016/j.mehy.2016.10.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/02/2016] [Accepted: 10/19/2016] [Indexed: 11/30/2022]
Abstract
Autism spectrum disorder (ASD) comprises a group of neurodevelopmental disorders for which various theories have been proposed. Each theory brings valuable insights and has experimental evidence backing it, yet none provides an overarching explanation for each of the pathological aspects involved in ASD. Here we present an integrative theory of ASD, centered on a sequence of events spanning from the molecular to the behavioral level. We propose that an abnormality in the interplay between retinoic acid and sex hormones predisposes an individual to specific molecular malfunctions. In turn, this molecular syndrome generates an altered brain connectivity between the cerebellum, the midbrain dopaminergic areas, and the prefrontal cortex. Lastly, this disconnection would generate specific behavioral traits traditionally involved in ASD. Therefore, this paper represents a step forward in unifying different levels of pathological features into novel integrated testable hypotheses.
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Affiliation(s)
- Alexandru-Ştefan Niculae
- The Department of Molecular Sciences, Faculty of Medicine, 'Iuliu Hațieganu' University of Medicine and Pharmacy, 6 Louis Pasteur, 400349 Cluj-Napoca, Romania
| | - Denis Pavăl
- The Department of Molecular Sciences, Faculty of Medicine, 'Iuliu Hațieganu' University of Medicine and Pharmacy, 6 Louis Pasteur, 400349 Cluj-Napoca, Romania.
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22
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Investigating the Impact of a Genome-Wide Supported Bipolar Risk Variant of MAD1L1 on the Human Reward System. Neuropsychopharmacology 2016; 41:2679-87. [PMID: 27184339 PMCID: PMC5026735 DOI: 10.1038/npp.2016.70] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 05/03/2016] [Accepted: 05/05/2016] [Indexed: 01/22/2023]
Abstract
Recent genome-wide association studies have identified MAD1L1 (mitotic arrest deficient-like 1) as a susceptibility gene for bipolar disorder and schizophrenia. The minor allele of the single-nucleotide polymorphism (SNP) rs11764590 in MAD1L1 was associated with bipolar disorder. Both diseases, bipolar disorder and schizophrenia, are linked to functional alterations in the reward system. We aimed at investigating possible effects of the MAD1L1 rs11764590 risk allele on reward systems functioning in healthy adults. A large homogenous sample of 224 young (aged 18-31 years) participants was genotyped and underwent functional magnetic resonance imaging (fMRI). All participants performed the 'Desire-Reason Dilemma' paradigm investigating the neural correlates that underlie reward processing and active reward dismissal in favor of a long-term goal. We found significant hypoactivations of the ventral tegmental area (VTA), the bilateral striatum and bilateral frontal and parietal cortices in response to conditioned reward stimuli in the risk allele carriers compared with major allele carriers. In the dilemma situation, functional connectivity between prefrontal brain regions and the ventral striatum was significantly diminished in the risk allele carriers. Healthy risk allele carriers showed a significant deficit of their bottom-up response to conditioned reward stimuli in the bilateral VTA and striatum. Furthermore, functional connectivity between the ventral striatum and prefrontal areas exerting top-down control on the mesolimbic reward system was reduced in this group. Similar alterations in reward processing and disturbances of prefrontal control mechanisms on mesolimbic brain circuits have also been reported in bipolar disorder and schizophrenia. Together, these findings suggest the existence of an intermediate phenotype associated with MAD1L1.
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23
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McDonald V, Hauner KK, Chau A, Krueger F, Grafman J. Networks underlying trait impulsivity: Evidence from voxel-based lesion-symptom mapping. Hum Brain Mapp 2016; 38:656-665. [PMID: 27667777 DOI: 10.1002/hbm.23406] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 08/08/2016] [Accepted: 09/07/2016] [Indexed: 02/01/2023] Open
Abstract
Impulsivity is considered a multidimensional construct that encompasses a range of behaviors, including poor impulse control, premature decision-making, and the inability to delay gratification. In order to determine the extent to which impulsivity and its components share a common network, a voxel-based lesion-symptom mapping (VLSM) analysis was performed in a large sample of patients (N = 131) with focal, penetrating traumatic brain injuries (pTBI). Impulsivity was assessed using the Barratt Impulsiveness Scale (BIS-11), a standard self-report measure that allows for unique estimates of global impulsivity and its factor analysis-derived components (e.g., "motor impulsivity"). Heightened global impulsivity was associated with damage to multiple areas in bilateral prefrontal cortex (PFC), left superior, middle and inferior temporal gyrus, and left hippocampus. Moreover, a cluster was identified within the left PFC associated specifically with motor impulsivity (defined as "acting without thinking"). The results were consistent with the existing literature on bilateral prefrontal cortical involvement in behavioral impulsivity, but also provided new evidence for a more complex neuroanatomical representation of this construct, characterized by left-lateralized temporal and hippocampal involvement, as well as a left-lateralized prefrontal network specifically associated with motor impulsivity. Hum Brain Mapp 38:656-665, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Valerie McDonald
- Cognitive Neuroscience Laboratory, Rehabilitation Institute of Chicago, Chicago, Illinois
| | - Katherina K Hauner
- Cognitive Neuroscience Laboratory, Rehabilitation Institute of Chicago, Chicago, Illinois.,Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.,Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Aileen Chau
- Cognitive Neuroscience Laboratory, Rehabilitation Institute of Chicago, Chicago, Illinois
| | - Frank Krueger
- Molecular Neuroscience Department, George Mason University, Fairfax, Virginia.,Department of Psychology, George Mason University, Fairfax, Virginia
| | - Jordan Grafman
- Cognitive Neuroscience Laboratory, Rehabilitation Institute of Chicago, Chicago, Illinois.,Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.,Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
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24
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Lei X, Han Z, Chen C, Bai L, Xue G, Dong Q. Sex Differences in Fiber Connection between the Striatum and Subcortical and Cortical Regions. Front Comput Neurosci 2016; 10:100. [PMID: 27721750 PMCID: PMC5034007 DOI: 10.3389/fncom.2016.00100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 09/07/2016] [Indexed: 01/31/2023] Open
Abstract
The striatum is an important subcortical structure with extensive connections to other regions of the brain. These connections are believed to play important roles in behaviors such as reward-related processes and impulse control, which show significant sex differences. However, little is known about sex differences in the striatum-projected fiber connectivity. The current study examined sex differences between 50 Chinese males and 79 Chinese females in their fiber connections between the striatum and nine selected cortical and subcortical regions. Despite overall similarities, males showed stronger fiber connections between the left caudate and rostral cingulate cortex, between the right putamen and the lateral orbitofrontal cortex, between the bilateral putamen and the ventro-lateral prefrontal cortex, and between the right caudate and the ventro-lateral prefrontal cortex, whereas females showed stronger fiber connections between the right putamen and the dorsolateral prefrontal cortex, between bilateral caudate and hippocampus, and between the left putamen and hippocampus. These findings help us to understand sex differences in the striatum-projected fiber connections and their implications for sex differences in behaviors.
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Affiliation(s)
- Xuemei Lei
- School of Psychology, Beijing Normal University Beijing, China
| | - Zhuo Han
- School of Psychology, Beijing Normal University Beijing, China
| | - Chuansheng Chen
- Department of Psychology and Social Behavior, University of California Irvine, CA, USA
| | - Lu Bai
- School of Psychology, Beijing Normal University Beijing, China
| | - Gui Xue
- National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University Beijing, China
| | - Qi Dong
- National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University Beijing, China
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25
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Fattore L, Melis M. Sex differences in impulsive and compulsive behaviors: a focus on drug addiction. Addict Biol 2016; 21:1043-51. [PMID: 26935237 DOI: 10.1111/adb.12381] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 02/02/2016] [Indexed: 12/19/2022]
Abstract
Sex differences in inhibition and self-regulation at a behavioral level have been widely described. From an evolutionary point of view, the different selection pressures placed on male and female hominids led them to differ in their behavioral strategies that allowed our species to survive during natural selection processes. These differences reflect changes in neural and structural plasticity that might be the core of sex differences, and of the susceptibility towards one psychiatric condition rather than another. The goal of the present review is to summarize current evidence for such a dichotomy in impulsive and compulsive behavior with a focus on drug addiction. Sex-dependent differences in drug abuse and dependence will be examined in the context of pathophysiological regulation of impulse and motivation by neuromodulators (i.e. gonadal hormones) and neurotransmitters (i.e. dopamine). Advances in the understanding of the sex differences in the capability to control impulses and motivational states is key for the determination of efficacious biologically based intervention and prevention strategies for several neuropsychiatric disorders where loss of impulse control and compulsivity are the core symptoms.
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Affiliation(s)
- Liana Fattore
- Institute of Neuroscience-Cagliari National Research Council of Italy; Cittadella Universitaria di Monserrato; Italy
- Centre of Excellence ‘Neurobiology of Dependence’; University of Cagliari; Italy
| | - Miriam Melis
- Centre of Excellence ‘Neurobiology of Dependence’; University of Cagliari; Italy
- Department of Biomedical Sciences, Division of Neuroscience and Clinical Pharmacology; Cittadella Universitaria di Monserrato, University of Cagliari; Italy
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Richter A, Petrovic A, Diekhof EK, Trost S, Wolter S, Gruber O. Hyperresponsivity and impaired prefrontal control of the mesolimbic reward system in schizophrenia. J Psychiatr Res 2015; 71:8-15. [PMID: 26522867 DOI: 10.1016/j.jpsychires.2015.09.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 09/09/2015] [Accepted: 09/11/2015] [Indexed: 01/08/2023]
Abstract
Schizophrenia is characterized by substantial dysfunctions of reward processing, leading to detrimental consequences for decision-making. The neurotransmitter dopamine is responsible for the transmission of reward signals and also known to be involved in the mechanism of psychosis. Using functional magnetic resonance imaging (fMRI), sixteen medicated patients with schizophrenia and sixteen healthy controls performed the 'desire-reason dilemma' (DRD) paradigm. This paradigm allowed us to directly investigate reward-related brain activations depending on the interaction of bottom-up and top-down mechanisms, when a previously conditioned reward stimulus had to be rejected to achieve a superordinate long-term goal. Both patients and controls showed significant activations in the mesolimbic reward system. In patients with schizophrenia, however, we found a significant hyperactivation of the left ventral striatum (vStr) when they were allowed to accept the conditioned reward stimuli, and a reduced top-down regulation of activation in the ventral striatum (vStr) and ventral tegmental area (VTA) while having to reject the immediate reward to pursue the superordinate task-goal. Moreover, while healthy subjects exhibited a negative functional coupling of the vStr with both the anteroventral prefrontal cortex (avPFC) and the ventromedial prefrontal cortex (VMPFC) in the dilemma situation, this functional coupling was significantly impaired in the patient group. These findings provide evidence for an increased ventral striatal activation to reward stimuli and an impaired top-down control of reward signals by prefrontal brain regions in schizophrenia.
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Affiliation(s)
- Anja Richter
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany.
| | - Aleksandra Petrovic
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
| | - Esther K Diekhof
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany; Biocenter Grindel and Zoological Museum, University of Hamburg, 20146, Germany
| | - Sarah Trost
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
| | - Sarah Wolter
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
| | - Oliver Gruber
- Center for Translational Research in Systems Neuroscience and Psychiatry, University Medical Center Göttingen, 37075, Germany
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Yildirim BO, Derksen JJL. Mesocorticolimbic dopamine functioning in primary psychopathy: A source of within-group heterogeneity. Psychiatry Res 2015; 229:633-77. [PMID: 26277034 DOI: 10.1016/j.psychres.2015.07.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 04/08/2015] [Accepted: 07/05/2015] [Indexed: 01/17/2023]
Abstract
Despite similar emotional deficiencies, primary psychopathic individuals can be situated on a continuum that spans from controlled to disinhibited. The constructs on which primary psychopaths are found to diverge, such as self-control, cognitive flexibility, and executive functioning, are crucially regulated by dopamine (DA). As such, the goal of this review is to examine which specific alterations in the meso-cortico-limbic DA system and corresponding genes (e.g., TH, DAT, COMT, DRD2, DRD4) might bias development towards a more controlled or disinhibited expression of primary psychopathy. Based on empirical data, it is argued that primary psychopathy is generally related to a higher tonic and population activity of striatal DA neurons and lower levels of D2-type DA receptors in meso-cortico-limbic projections, which may boost motivational drive towards incentive-laden goals, dampen punishment sensitivity, and increase future reward-expectancy. However, increasingly higher levels of DA activity in the striatum (moderate versus pathological elevations), lower levels of DA functionality in the prefrontal cortex, and higher D1-to-D2-type receptor ratios in meso-cortico-limbic projections may lead to increasingly disinhibited and impetuous phenotypes of primary psychopathy. Finally, in order to provide a more coherent view on etiological mechanisms, we discuss interactions between DA and serotonin that are relevant for primary psychopathy.
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Affiliation(s)
- Bariş O Yildirim
- Department of Clinical Psychology, Radboud University Nijmegen, De Kluyskamp 1002, 6545 JD Nijmegen, The Netherlands.
| | - Jan J L Derksen
- Department of Clinical Psychology, Room: A.07.04B, Radboud University Nijmegen, Montessorilaan 3, 6525 HR Nijmegen, The Netherlands.
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Fattore L. Reward processing and drug addiction: does sex matter? Front Neurosci 2015; 9:329. [PMID: 26483620 PMCID: PMC4586272 DOI: 10.3389/fnins.2015.00329] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Accepted: 09/01/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
- Liana Fattore
- CNR Institute of Neuroscience-Cagliari, National Research Council-Italy, and Centre of Excellence "Neurobiology of Dependence," Cittadella Universitaria di Monserrato, University of Cagliari Cagliari, Italy
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Diekhof EK. Be quick about it. Endogenous estradiol level, menstrual cycle phase and trait impulsiveness predict impulsive choice in the context of reward acquisition. Horm Behav 2015; 74:186-93. [PMID: 26092059 DOI: 10.1016/j.yhbeh.2015.06.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 05/26/2015] [Accepted: 06/11/2015] [Indexed: 11/20/2022]
Abstract
This article is part of a Special Issue "Estradiol and Cognition". Variations in the steroid hormone 17ß-estradiol (E2) may promote intra-individual differences in reward seeking behavior and temporal decision-making (Reimers et al., 2014; Front. Neurosci. 8: 401). Yet, in humans the exact role of E2 in impulsive choice still needs to be determined. The present study assessed the effect of a cycle-dependent rise in endogenous E2 on temporal response adaptation across the follicular phase (FP). For this purpose a reward acquisition paradigm was employed that is sensitive to hormone-induced changes in central dopamine (DA) level. The present data show that women acted more impulsively in the early as opposed to the late FP. Early follicular E2 further correlated with an increased capacity to speed up for reward maximization, while simultaneously the ability to wait for higher reward was compromised. This correlation was most pronounced in women with low trait impulsiveness. In contrast, E2 and optimized response speed failed to correlate in women with high trait impulsiveness and in the late FP, despite a generally higher E2 level. Collectively, these findings support the theory that E2 may act as an endogenous DA agonist. The fact that the hormone-behavior relationship was restricted to women with low trait impulsiveness and thus supposedly lower central DA level provides indirect support for this idea. Yet, choices became relatively less impulsive in the state of heightened E2 (i.e., in the late FP), suggesting that the relationship between E2 and impulsive choice may not be linear, but might resemble an inverted U-function.
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Affiliation(s)
- Esther K Diekhof
- Biocenter Grindel and Zoological Museum, Department of Human Biology, Neuroendocinology Unit, Hamburg University, Martin-Luther-King Platz 3, D-20146 Hamburg, Germany.
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Root DH, Melendez RI, Zaborszky L, Napier TC. The ventral pallidum: Subregion-specific functional anatomy and roles in motivated behaviors. Prog Neurobiol 2015; 130:29-70. [PMID: 25857550 PMCID: PMC4687907 DOI: 10.1016/j.pneurobio.2015.03.005] [Citation(s) in RCA: 220] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 03/19/2015] [Accepted: 03/29/2015] [Indexed: 12/17/2022]
Abstract
The ventral pallidum (VP) plays a critical role in the processing and execution of motivated behaviors. Yet this brain region is often overlooked in published discussions of the neurobiology of mental health (e.g., addiction, depression). This contributes to a gap in understanding the neurobiological mechanisms of psychiatric disorders. This review is presented to help bridge the gap by providing a resource for current knowledge of VP anatomy, projection patterns and subregional circuits, and how this organization relates to the function of VP neurons and ultimately behavior. For example, ventromedial (VPvm) and dorsolateral (VPdl) VP subregions receive projections from nucleus accumbens shell and core, respectively. Inhibitory GABAergic neurons of the VPvm project to mediodorsal thalamus, lateral hypothalamus, and ventral tegmental area, and this VP subregion helps discriminate the appropriate conditions to acquire natural rewards or drugs of abuse, consume preferred foods, and perform working memory tasks. GABAergic neurons of the VPdl project to subthalamic nucleus and substantia nigra pars reticulata, and this VP subregion is modulated by, and is necessary for, drug-seeking behavior. Additional circuits arise from nonGABAergic neuronal phenotypes that are likely to excite rather than inhibit their targets. These subregional and neuronal phenotypic circuits place the VP in a unique position to process motivationally relevant stimuli and coherent adaptive behaviors.
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Affiliation(s)
- David H Root
- Department of Psychology, Rutgers University, 152 Frelinghuysen Road, New Brunswick, NJ 08854, United States.
| | - Roberto I Melendez
- Department of Anatomy and Neurobiology, University of Puerto Rico School of Medicine, San Juan, PR 00936, United States.
| | - Laszlo Zaborszky
- Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, 197 University Avenue, Newark, NJ 07102, United States.
| | - T Celeste Napier
- Departments of Pharmacology and Psychiatry, Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612, United States.
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Barratt Impulsivity and Neural Regulation of Physiological Arousal. PLoS One 2015; 10:e0129139. [PMID: 26079873 PMCID: PMC4469608 DOI: 10.1371/journal.pone.0129139] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 05/05/2015] [Indexed: 12/27/2022] Open
Abstract
Background Theories of personality have posited an increased arousal response to external stimulation in impulsive individuals. However, there is a dearth of studies addressing the neural basis of this association. Methods We recorded skin conductance in 26 individuals who were assessed with Barratt Impulsivity Scale (BIS-11) and performed a stop signal task during functional magnetic resonance imaging. Imaging data were processed and modeled with Statistical Parametric Mapping. We used linear regressions to examine correlations between impulsivity and skin conductance response (SCR) to salient events, identify the neural substrates of arousal regulation, and examine the relationship between the regulatory mechanism and impulsivity. Results Across subjects, higher impulsivity is associated with greater SCR to stop trials. Activity of the ventromedial prefrontal cortex (vmPFC) negatively correlated to and Granger caused skin conductance time course. Furthermore, higher impulsivity is associated with a lesser strength of Granger causality of vmPFC activity on skin conductance, consistent with diminished control of physiological arousal to external stimulation. When men (n = 14) and women (n = 12) were examined separately, however, there was evidence suggesting association between impulsivity and vmPFC regulation of arousal only in women. Conclusions Together, these findings confirmed the link between Barratt impulsivity and heightened arousal to salient stimuli in both genders and suggested the neural bases of altered regulation of arousal in impulsive women. More research is needed to explore the neural processes of arousal regulation in impulsive individuals and in clinical conditions that implicate poor impulse control.
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Wolf C, Mohr H, Diekhof EK, Vieker H, Goya-Maldonado R, Trost S, Krämer B, Keil M, Binder EB, Gruber O. CREB1 Genotype Modulates Adaptive Reward-Based Decisions in Humans. Cereb Cortex 2015; 26:2970-81. [PMID: 26045569 DOI: 10.1093/cercor/bhv104] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Cyclic AMP response element-binding protein (CREB) contributes to adaptation of mesocorticolimbic networks by modulating activity-regulated transcription and plasticity in neurons. Activity or expression changes of CREB in the nucleus accumbens (NAc) and orbital frontal cortex (OFC) interact with behavioral changes during reward-motivated learning. However, these findings from animal models have not been evaluated in humans. We tested whether CREB1 genotypes affect reward-motivated decisions and related brain activation, using BOLD fMRI in 224 young and healthy participants. More specifically, participants needed to adapt their decision to either pursue or resist immediate rewards to optimize the reward outcome. We found significant CREB1 genotype effects on choices to pursue increases of the reward outcome and on BOLD signal in the NAc, OFC, insula cortex, cingulate gyrus, hippocampus, amygdala, and precuneus during these decisions in comparison with those decisions avoiding total reward loss. Our results suggest that CREB1 genotype effects in these regions could contribute to individual differences in reward- and associative memory-based decision-making.
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Affiliation(s)
- Claudia Wolf
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany Laboratory of Behavioral Neuroscience, National Institute of Aging, Baltimore, MD 21224-6825, USA
| | - Holger Mohr
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany Department of General Psychology, Technical University Dresden, Dresden 01069, Germany
| | - Esther K Diekhof
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany Grindel Biocenter and Zoological Museum, Institute for Humanbiology, University Hamburg, Hamburg 20146, Germany
| | - Henning Vieker
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf, Hamburg 20246, Germany
| | - Roberto Goya-Maldonado
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany
| | - Sarah Trost
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany
| | - Bernd Krämer
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany
| | - Maria Keil
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany
| | | | - Oliver Gruber
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, Georg-August-University Göttingen, Göttingen 37075, Germany
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Kuhn C. Emergence of sex differences in the development of substance use and abuse during adolescence. Pharmacol Ther 2015; 153:55-78. [PMID: 26049025 DOI: 10.1016/j.pharmthera.2015.06.003] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 04/29/2015] [Indexed: 12/24/2022]
Abstract
Substance use and abuse begin during adolescence. Male and female adolescent humans initiate use at comparable rates, but males increase use faster. In adulthood, more men than women use and abuse addictive drugs. However, some women progress more rapidly from initiation of use to entry into treatment. In animal models, adolescent males and females consume addictive drugs similarly. However, reproductively mature females acquire self-administration faster, and in some models, escalate use more. Sex/gender differences exist in neurobiologic factors mediating both reinforcement (dopamine, opioids) and aversiveness (CRF, dynorphin), as well as intrinsic factors (personality, psychiatric co-morbidities) and extrinsic factors (history of abuse, environment especially peers and family) which influence the progression from initial use to abuse. Many of these important differences emerge during adolescence, and are moderated by sexual differentiation of the brain. Estradiol effects which enhance both dopaminergic and CRF-mediated processes contribute to the female vulnerability to substance use and abuse. Testosterone enhances impulsivity and sensation seeking in both males and females. Several protective factors in females also influence initiation and progression of substance use including hormonal changes of pregnancy as well as greater capacity for self-regulation and lower peak levels of impulsivity/sensation seeking. Same sex peers represent a risk factor more for males than females during adolescence, while romantic partners increase risk for women during this developmental epoch. In summary, biologic factors, psychiatric co-morbidities as well as personality and environment present sex/gender-specific risks as adolescents begin to initiate substance use.
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Affiliation(s)
- Cynthia Kuhn
- Department of Pharmacology and Cancer Biology, Box 3813, Duke University Medical Center, Durham, NC 27710, United States.
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Lee SW, Jeong BS, Choi J, Kim JW. Sex differences in interactions between nucleus accumbens and visual cortex by explicit visual erotic stimuli: an fMRI study. Int J Impot Res 2015; 27:161-6. [PMID: 25971857 DOI: 10.1038/ijir.2015.8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 01/08/2015] [Accepted: 04/18/2015] [Indexed: 12/15/2022]
Abstract
Men tend to have greater positive responses than women to explicit visual erotic stimuli (EVES). However, it remains unclear, which brain network makes men more sensitive to EVES and which factors contribute to the brain network activity. In this study, we aimed to assess the effect of sex difference on brain connectivity patterns by EVES. We also investigated the association of testosterone with brain connection that showed the effects of sex difference. During functional magnetic resonance imaging scans, 14 males and 14 females were asked to see alternating blocks of pictures that were either erotic or non-erotic. Psychophysiological interaction analysis was performed to investigate the functional connectivity of the nucleus accumbens (NA) as it related to EVES. Men showed significantly greater EVES-specific functional connection between the right NA and the right lateral occipital cortex (LOC). In addition, the right NA and the right LOC network activity was positively correlated with the plasma testosterone level in men. Our results suggest that the reason men are sensitive to EVES is the increased interaction in the visual reward networks, which is modulated by their plasma testosterone level.
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Affiliation(s)
- S W Lee
- Korea Advanced Institute of Science and Technology (KAIST), Laboratory of Clinical Neuroscience and Development, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - B S Jeong
- Korea Advanced Institute of Science and Technology (KAIST), Laboratory of Clinical Neuroscience and Development, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - J Choi
- Department of Psychiatry, Daejeon St Mary's Hospital, The Catholic University of Korea, College of Medicine, Daejeon, Republic of Korea
| | - J-W Kim
- Department of Psychiatry, College of Medical Science, Kongyang University, Daejeon, Republic of Korea
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35
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Goya-Maldonado R, Weber K, Trost S, Diekhof E, Keil M, Dechent P, Gruber O. Dissociating pathomechanisms of depression with fMRI: bottom-up or top-down dysfunctions of the reward system. Eur Arch Psychiatry Clin Neurosci 2015; 265:57-66. [PMID: 25327829 DOI: 10.1007/s00406-014-0552-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 10/06/2014] [Indexed: 01/17/2023]
Abstract
Depression is a debilitating psychiatric disorder characterized among other aspects by the inability to properly experience or respond to reward. However, it remains unclear whether patients with depression present impaired reward system due to abnormal modulatory mechanisms. We investigated the activation of the nucleus accumbens (NAcc), a crucial region involved in reward processing, with functional magnetic resonance imaging using the desire-reason-dilemma paradigm. This task allows tracking the activity of the NAcc during the acceptance or the rejection of previously conditioned reward stimuli. Patients were assigned into subgroups of lower (LA) or higher (HA) NAcc activation according to beta weights. LA patients presented significant hypoactivation in the ventral tegmental area in addition to bilateral ventral striatum, confirming impairments in the bottom-up input to the NAcc. Conversely, HA patients presented significant hyperactivation in prefrontal areas such as the rostral anterior cingulate cortex and the anterior ventral prefrontal cortex in addition to bilateral ventral striatum, suggesting disturbances in the top-down regulation of the NAcc. Demographic and clinical differences explaining the abnormal co-activations of midbrain and prefrontal regions were not identified. Therefore, we provide evidence for dysfunctional bottom-up processing in one potential neurobiological subtype of depression (LA) and dysfunctional top-down modulation in another subtype (HA). We suggest that the midbrain and prefrontal regions are more specific pathophysiological substrates for each depression subtype. Above all, our results encourage the segregation of patients by similar dysfunctional mechanisms of the dopaminergic system, which would finally contribute to disentangle more specific pathogeneses and guide the development of more personalized targets for future therapies.
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Affiliation(s)
- Roberto Goya-Maldonado
- Center for Translational Research in Systems Neuroscience and Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center, Georg August University, Göttingen, Germany,
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Is Impulsivity a Male Trait Rather than Female Trait? Exploring the Sex Difference in Impulsivity. Curr Behav Neurosci Rep 2015. [DOI: 10.1007/s40473-015-0031-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Gillies G, Virdee K, McArthur S, Dalley J. Sex-dependent diversity in ventral tegmental dopaminergic neurons and developmental programing: A molecular, cellular and behavioral analysis. Neuroscience 2014; 282:69-85. [PMID: 24943715 PMCID: PMC4245713 DOI: 10.1016/j.neuroscience.2014.05.033] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 05/12/2014] [Accepted: 05/18/2014] [Indexed: 02/02/2023]
Abstract
The knowledge that diverse populations of dopaminergic neurons within the ventral tegmental area (VTA) can be distinguished in terms of their molecular, electrophysiological and functional properties, as well as their differential projections to cortical and subcortical regions has significance for key brain functions, such as the regulation of motivation, working memory and sensorimotor control. Almost without exception, this understanding has evolved from landmark studies performed in the male sex. However, converging evidence from both clinical and pre-clinical studies illustrates that the structure and functioning of the VTA dopaminergic systems are intrinsically different in males and females. This may be driven by sex differences in the hormonal environment during adulthood ('activational' effects) and development (perinatal and/or pubertal 'organizational' effects), as well as genetic factors, especially the SRY gene on the Y chromosome in males, which is expressed in a sub-population of adult midbrain dopaminergic neurons. Stress and stress hormones, especially glucocorticoids, are important factors which interact with the VTA dopaminergic systems in order to achieve behavioral adaptation and enable the individual to cope with environmental change. Here, also, there is male/female diversity not only during adulthood, but also in early life when neurobiological programing by stress or glucocorticoid exposure differentially impacts dopaminergic developmental trajectories in male and female brains. This may have enduring consequences for individual resilience or susceptibility to pathophysiological change induced by stressors in later life, with potential translational significance for sex bias commonly found in disorders involving dysfunction of the mesocorticolimbic dopaminergic systems. These findings highlight the urgent need for a better understanding of the sexual dimorphism in the VTA if we are to improve strategies for the prevention and treatment of debilitating conditions which differentially affect men and women in their prevalence and nature, including schizophrenia, attention/deficit hyperactivity disorder, autism spectrum disorders, anxiety, depression and addiction.
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Affiliation(s)
- G.E. Gillies
- Division of Brain Sciences, Imperial College London, Hammersmith Hospital, London, UK,Corresponding author. Address: Division of Brain Sciences, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK. Tel: +44-(0)-20-7594-7050.
| | - K. Virdee
- Behavioural and Clinical Neuroscience Institute, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK,Department of Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK
| | - S. McArthur
- William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Charterhouse Square, London EC1 6BQ, UK
| | - J.W. Dalley
- Behavioural and Clinical Neuroscience Institute, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK,Department of Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK,Department of Psychiatry, University of Cambridge, Addenbrooke’s Hospital, Hill’s Road, Cambridge CB2 2QQ, UK
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Trost S, Diekhof EK, Zvonik K, Lewandowski M, Usher J, Keil M, Zilles D, Falkai P, Dechent P, Gruber O. Disturbed anterior prefrontal control of the mesolimbic reward system and increased impulsivity in bipolar disorder. Neuropsychopharmacology 2014; 39:1914-23. [PMID: 24535101 PMCID: PMC4059900 DOI: 10.1038/npp.2014.39] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 02/12/2014] [Accepted: 02/12/2014] [Indexed: 01/19/2023]
Abstract
Bipolar disorder (BD) is characterized by recurrent mood episodes ranging from severe depression to acute full-blown mania. Both states of this severe psychiatric disorder have been associated with alterations of reward processing in the brain. Here, we present results of a functional magnetic resonance imaging (fMRI) study on the neural correlates and functional interactions underlying reward gain processing and reward dismissal in favor of a long-term goal in bipolar patients. Sixteen medicated patients diagnosed with bipolar I disorder, euthymic to mildly depressed, and sixteen matched healthy controls performed the 'desire-reason dilemma' (DRD) paradigm demanding rejection of priorly conditioned reward stimuli to successfully pursue a superordinate goal. Both groups exhibited significant activations in reward-related brain regions, particularly in the mesolimbic reward system. However, bipolar patients showed reduced neural responses of the ventral striatum (vStr) when exploiting a reward stimulus, and exhibited a decreased suppression of the reward-related activation of the mesolimbic reward system while having to reject immediate reward in favor of the long-term goal. Further, functional interaction between the anteroventral prefrontal cortex and the vStr in the 'DRD' was significantly impaired in the bipolar group. These findings provide evidence for a reduced responsivity of the vStr to reward stimuli in BD, possibly related to clinical features like anhedonia. The disturbed top-down control of mesolimbic reward signals by prefrontal brain regions in BD can be interpreted in terms of a disease-related enhanced impulsivity, a trait marker of BD.
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Affiliation(s)
- Sarah Trost
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany,Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen 37075, Germany, Tel: +49 551 39 10115/6615 (-8952), Fax: +49 551 398952, E-mail:
| | - Esther Kristina Diekhof
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany,Biocenter Grindeland Zoological Museum, Institute for Human Biology, University of Hamburg, Hamburg, Germany
| | - Kerstin Zvonik
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
| | - Mirjana Lewandowski
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
| | - Juliana Usher
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
| | - Maria Keil
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
| | - David Zilles
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
| | - Peter Falkai
- Department of Psychiatry and Psychotherapy, Ludwig-Maximilians-University, Munich, Germany
| | - Peter Dechent
- Department of Cognitive Neurology, Georg August University, Goettingen, Germany
| | - Oliver Gruber
- Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Goettingen, Germany
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Kerr KL, Avery JA, Barcalow JC, Moseman SE, Bodurka J, Bellgowan PSF, Simmons WK. Trait impulsivity is related to ventral ACC and amygdala activity during primary reward anticipation. Soc Cogn Affect Neurosci 2014; 10:36-42. [PMID: 24526181 DOI: 10.1093/scan/nsu023] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Trait impulsivity is characterized by behavioral disinhibition and rash decision-making that contribute to many maladaptive behaviors. Previous research demonstrates that trait impulsivity is related to the activity of brain regions underlying reward sensitivity and emotion regulation, but little is known about this relationship in the context of immediately available primary reward. This is unfortunate, as impulsivity in these contexts can lead to unhealthy behaviors, including poor food choices, dangerous drug use and risky sexual practices. In addition, little is known about the relationship between integration of reward and affective neurocircuitry, as measured by resting-state functional connectivity, and trait impulsivity in everyday life, as measured with a commonly used personality inventory. We therefore asked healthy adults to undergo a functional magnetic resonance imaging task in which they saw cues indicating the imminent oral administration of rewarding taste, as well as a resting-state scan. Trait impulsivity was associated with increased activation during anticipation of primary reward in the anterior cingulate cortex (ACC) and amygdala. Additionally, resting-state functional connectivity between the ACC and the right amygdala was negatively correlated with trait impulsivity. These findings demonstrate that trait impulsivity is related not only to ACC-amygdala activation but also to how tightly coupled these regions are to one another.
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Affiliation(s)
- Kara L Kerr
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - Jason A Avery
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - Joel C Barcalow
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - Scott E Moseman
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - Jerzy Bodurka
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - Patrick S F Bellgowan
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
| | - W Kyle Simmons
- Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA Laureate Institute for Brain Research, Tulsa, OK 74136-3326, USA, Department of Psychology, The University of Tulsa, Tulsa, OK 74104, USA, Department of Biological Sciences, The University of Tulsa, Tulsa, OK 74104, USA, Laureate Psychiatric Clinics and Hospital, Tulsa, OK 74136, USA, College of Engineering, The University of Oklahoma, Tulsa, OK 74135, USA, and Faculty of Community Medicine, The University of Tulsa, Tulsa, OK 74104, USA
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