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Embury CM, Lord GH, Drincic AT, Desouza CV, Wilson TW. Glycemic control level alters working memory neural dynamics in adults with type 2 diabetes. Cereb Cortex 2023; 33:8333-8341. [PMID: 37005060 PMCID: PMC10321117 DOI: 10.1093/cercor/bhad119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 03/12/2023] [Accepted: 03/13/2023] [Indexed: 04/04/2023] Open
Abstract
Poor glycemic control in type 2 diabetes has been associated with accentuated age-related cognitive decline, although the underlying neural mechanisms are not well understood. The current study sought to identify the impact of glycemic control on the neural dynamics serving working memory in adults with type 2 diabetes. Participants (n = 34, ages = 55-73) performed a working memory task while undergoing MEG. Significant neural responses were examined relative to poorer (A1c > 7.0%) or tighter glycemic control (A1c < 7.0%). Those with poorer glycemic control showed diminished responses within left temporal and prefrontal regions during encoding and showed diminished responses within right occipital cortex during maintenance but showed an enhanced activity in the left temporal, occipital, and cerebellar regions during maintenance. Notably, left temporal activity in encoding and left lateral occipital activity in maintenance significantly predicted performance on the task such that diminished temporal activity led to longer reaction times, which were driven by the poorer glycemic control group. Greater lateral occipital activity during maintenance was associated with both lower accuracy and longer reaction times across all participants. These findings suggest that glycemic control has a robust impact on the neural dynamics serving working memory, with distinct effects by subprocess (e.g. encoding vs. maintenance) and direct effects on behavior.
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Affiliation(s)
- Christine M Embury
- Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, United States
- Department of Psychology, University of Nebraska, Omaha, NE 68182, United States
| | - Grace H Lord
- Department of Internal Medicine, Division of Diabetes, Endocrinology, and Metabolism, UNMC, Omaha, NE 68198, United States
| | - Andjela T Drincic
- Department of Internal Medicine, Division of Diabetes, Endocrinology, and Metabolism, UNMC, Omaha, NE 68198, United States
| | - Cyrus V Desouza
- Department of Internal Medicine, Division of Diabetes, Endocrinology, and Metabolism, UNMC, Omaha, NE 68198, United States
| | - Tony W Wilson
- Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, United States
- Department of Psychology, University of Nebraska, Omaha, NE 68182, United States
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2
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Russell B, Mussap AJ. Posttraumatic stress, visual working memory, and visual imagery in military personnel. CURRENT PSYCHOLOGY 2023; 43:1-18. [PMID: 36845204 PMCID: PMC9942044 DOI: 10.1007/s12144-023-04338-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2023] [Indexed: 02/23/2023]
Abstract
Posttraumatic stress disorder (PTSD) is characterized by disruptions to cognitive functioning. Two studies were conducted to examine the relevance of military-related PTSD to two cognitive functions - visual working memory and visual imagery. Participants were military personnel who reported their PTSD diagnosis history and completed a self-administered screening tool for PTSD, the PTSD Checklist - Military Version. In Study 1, 138 personnel also completed a memory span task and a 2-back task using colored words in which Stroop interference was introduced via the semantic content of the words. In Study 2, a separate group of 211 personnel completed measures of perceived imagery vividness and spontaneous use of visual imagery. Interference effects on working memory in PTSD-diagnosed military personnel were not replicated. However, ANCOVA and structural equation modelling revealed that PTSD-intrusions were associated with poorer working memory whereas PTSD-arousal was associated with spontaneous use of visual imagery. We interpret these results as evidence that intrusive flashbacks disrupt working memory performance not by limiting memory capacity nor by interfering directly with memory functions such as inhibition, but by adding internal noise in the form of task-irrelevant memories and emotions. Visual imagery appears to be unrelated to these flashbacks but with arousal symptoms of PTSD, perhaps in the form of flashforwards about feared/anticipated threats.
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Affiliation(s)
- Brenton Russell
- School of Psychology, Deakin University, 221 Burwood Highway, 3125 Melbourne, Australia
| | - Alexander J. Mussap
- School of Psychology, Deakin University, 221 Burwood Highway, 3125 Melbourne, Australia
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3
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McGonigle CE, Lapish CC, Logrip ML. Male and female impairments in odor span are observed in a rat model of PTSD. Learn Mem 2023; 30:1-11. [PMID: 36543385 PMCID: PMC9872191 DOI: 10.1101/lm.053620.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 11/29/2022] [Indexed: 12/24/2022]
Abstract
Posttraumatic stress disorder (PTSD) is associated with neural and behavioral alterations in response to trauma exposure, including working memory impairments. Rodent models of PTSD have not fully investigated chronic or reactive working memory deficits, despite clinical relevance. The present study uses footshock to induce a posttraumatic stress state in male and female rats and evaluates the effect of footshock and trauma-paired odor cues on working memory performance in the odor span task. Results demonstrate the emergence of chronic deficits in working memory among animals exposed to footshock by 3 wk after traumatic stress. The presentation of a trauma-paired odor cue was associated with further decrement in working memory performance for male animals. Furthermore, anxiety-like behaviors associated with the PTSD-like phenotype could predict the degree of working memory impairment in response to the trauma-paired odor cue. This study enhances validation of an existing rodent model of PTSD through replication of the clinical observations of working memory deficits associated with PTSD and provides novel insight into effects in female rodents. This will facilitate work to probe underlying mechanistic dysregulation of working memory following footshock trauma exposure and future development of novel treatment strategies.
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Affiliation(s)
- Colleen E McGonigle
- Addiction Neuroscience, Department of Psychology, Indiana Alcohol Research Center, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Christopher C Lapish
- Addiction Neuroscience, Department of Psychology, Indiana Alcohol Research Center, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
- Stark Neuroscience Research Institute, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Marian L Logrip
- Addiction Neuroscience, Department of Psychology, Indiana Alcohol Research Center, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
- Stark Neuroscience Research Institute, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
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4
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Comparing resting-state connectivity of working memory networks in U.S. Service members with mild traumatic brain injury and posttraumatic stress disorder. Brain Res 2022; 1796:148099. [PMID: 36162495 DOI: 10.1016/j.brainres.2022.148099] [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: 01/28/2022] [Revised: 08/31/2022] [Accepted: 09/20/2022] [Indexed: 11/23/2022]
Abstract
Mild traumatic brain injury (mTBI) and posttraumatic stress disorder (PTSD) are prevalent among military populations, and both have been associated with working memory (WM) impairments. Previous resting-state functional connectivity (rsFC) research conducted separately in PTSD and mTBI populations suggests that there may be similar and distinct abnormalities in WM-related networks. However, no studies have compared rsFC of WM brain regions in participants with mTBI versus PTSD. We used resting-state fMRI to investigate rsFC of WM networks in U.S. Service Members (n = 127; ages 18-59) with mTBI only (n = 46), PTSD only (n = 24), and an orthopedically injured (OI) control group (n = 57). We conducted voxelwise rsFC analyses with WM brain regions to test for differences in WM network connectivity in mTBI versus PTSD. Results revealed reduced rsFC between ventrolateral prefrontal cortex (vlPFC), lateral premotor cortex, and dorsolateral prefrontal cortex (dlPFC) WM regions and brain regions in the dorsal attention and somatomotor networks in both mTBI and PTSD groups versus controls. When compared to those with mTBI, individuals with PTSD had lower rsFC between both the lateral premotor WM seed region and middle occipital gyrus as well as between the dlPFC WM seed region and paracentral lobule. Interestingly, only vlPFC connectivity was significantly associated with WM performance across the samples. In conclusion, we found primarily overlapping patterns of reduced rsFC in WM brain regions in both mTBI and PTSD groups. Our finding of decreased vlPFC connectivity associated with WM is consistent with previous clinical and neuroimaging studies. Overall, these results provide support for shared neural substrates of WM in individuals with either mTBI or PTSD.
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5
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Bardeen JR, Gorday JY, Weathers FW. Executive functioning deficits exacerbate posttraumatic stress symptoms: A longitudinal mediation model. J Anxiety Disord 2022; 87:102556. [PMID: 35276509 PMCID: PMC8996315 DOI: 10.1016/j.janxdis.2022.102556] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 01/16/2022] [Accepted: 03/02/2022] [Indexed: 10/18/2022]
Abstract
Executive functioning (EF) consists of a set of related, but distinct, higher-level cognitive abilities that are used to organize and integrate lower-level processes in the service of engaging in goal-direct behavior. Evidence suggests that deficits in EF are a vulnerability factor for the development of posttraumatic stress (PTS) symptoms. Less understood, however, is the role that EF plays in symptom maintenance and exacerbation following trauma exposure. As such, the primary purpose of the present study was to determine whether EF deficits exacerbate PTS symptoms over the course of one year. A secondary aim of this study was to use a cross-lagged design to determine the directional relations among EF deficits and PTS. Trauma-exposed adults (N = 98) completed a clinical interview and self-report measures at an initial assessment session (Time 1 [T1]). Participants also completed self-report measures at 6- (Time 2 [T2]; n = 92) and 12-month (Time 3 [T3]; n = 91) follow-up sessions. As predicted, EF deficits at T2 mediated the relationship between PTS symptoms from T1 to T3, thus suggesting that EF deficits exacerbate PTS symptoms following trauma exposure. Results from a cross-lagged path analysis from T2 to T3 suggest that deficits in EF exert a stronger influence on the maintenance of PTS symptoms than vice versa. These results have implications for (a) identifying individuals that are at elevated risk for developing PTS symptoms, (b) developing precision medicine-based approaches for alleviating PTS symptoms, and (c) improving well-established PTSD treatments for those with relative deficits in EF.
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6
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Taylor BK, Heinrichs-Graham E, Eastman JA, Frenzel MR, Wang YP, Calhoun VD, Stephen JM, Wilson TW. Longitudinal changes in the neural oscillatory dynamics underlying abstract reasoning in children and adolescents. Neuroimage 2022; 253:119094. [PMID: 35306160 PMCID: PMC9152958 DOI: 10.1016/j.neuroimage.2022.119094] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 11/18/2022] Open
Abstract
Fluid reasoning is the ability to problem solve in the absence of prior knowledge and is commonly conceptualized as “non-verbal” intelligence. Importantly, fluid reasoning abilities rapidly develop throughout childhood and adolescence. Although numerous studies have characterized the neural underpinnings of fluid reasoning in adults, there is a paucity of research detailing the developmental trajectory of this neural processing. Herein, we examine longitudinal changes in the neural oscillatory dynamics underlying fluid intelligence in a sample of typically developing youths. A total of 34 participants age 10 to 16 years-old completed an abstract reasoning task during magnetoencephalography (MEG) on two occasions set one year apart. We found robust longitudinal optimization in theta, beta, and gamma oscillatory activity across years of the study across a distributed network commonly implicated in fluid reasoning abilities. More specifically, activity tended to decrease longitudinally in additional, compensatory areas such as the right lateral prefrontal cortex and increase in areas commonly utilized in mature adult samples (e.g., left frontal and parietal cortices). Importantly, shifts in neural activity were associated with improvements in task performance from one year to the next. Overall, the data suggest a longitudinal shift in performance that is accompanied by a reconfiguration of the functional oscillatory dynamics serving fluid reasoning during this important period of development.
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Affiliation(s)
- Brittany K Taylor
- Institute for Human Neuroscience, Boys Town National Research Hospital, 378 Bucher Circle, Boys Town, NE 68010, USA; Department of Pharmacology and Neuroscience, Creighton University, Omaha, NE, USA.
| | - Elizabeth Heinrichs-Graham
- Institute for Human Neuroscience, Boys Town National Research Hospital, 378 Bucher Circle, Boys Town, NE 68010, USA; Department of Pharmacology and Neuroscience, Creighton University, Omaha, NE, USA
| | - Jacob A Eastman
- Institute for Human Neuroscience, Boys Town National Research Hospital, 378 Bucher Circle, Boys Town, NE 68010, USA
| | - Michaela R Frenzel
- Institute for Human Neuroscience, Boys Town National Research Hospital, 378 Bucher Circle, Boys Town, NE 68010, USA
| | - Yu-Ping Wang
- Department of Biomedical Engineering, Tulane University, New Orleans, LA, USA
| | - Vince D Calhoun
- Tri-institutional Center for Translational Research in Neuroimaging and Data Science (TReNDS), Georgia State University, Georgia Institute of Technology, Emory University, Atlanta, GA, USA; Mind Research Network, Albuquerque, NM, USA
| | | | - Tony W Wilson
- Institute for Human Neuroscience, Boys Town National Research Hospital, 378 Bucher Circle, Boys Town, NE 68010, USA; Department of Pharmacology and Neuroscience, Creighton University, Omaha, NE, USA
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7
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Killanin AD, Embury CM, Picci G, Heinrichs-Graham E, Wang YP, Calhoun VD, Stephen JM, Wilson TW. Trauma moderates the development of the oscillatory dynamics serving working memory in a sex-specific manner. Cereb Cortex 2022; 32:5206-5215. [PMID: 35106552 PMCID: PMC9667155 DOI: 10.1093/cercor/bhac008] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 02/03/2023] Open
Abstract
Working memory, the ability to hold items in memory stores for further manipulation, is a higher order cognitive process that supports many aspects of daily life. Childhood trauma has been associated with altered cognitive development including particular deficits in verbal working memory (VWM), but the neural underpinnings remain poorly understood. Magnetoencephalography (MEG) studies of VWM have reliably shown decreased alpha activity in left-lateralized language regions during encoding, and increased alpha activity in parieto-occipital cortices during the maintenance phase. In this study, we examined whether childhood trauma affects behavioral performance and the oscillatory dynamics serving VWM using MEG in a cohort of 9- to 15-year-old youth. All participants completed a modified version of the UCLA Trauma History Profile and then performed a VWM task during MEG. Our findings indicated a sex-by-age-by-trauma three-way interaction, whereby younger females experiencing higher levels of trauma had the lowest d' accuracy scores and the strongest positive correlations with age (i.e. older performed better). Likewise, females with higher levels of childhood trauma exhibited altered age-related alpha changes during the maintenance phase within the right temporal and parietal cortices. These findings suggest that trauma exposure may alter the developmental trajectory of neural oscillations serving VWM processing in a sex-specific way.
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Affiliation(s)
- Abraham D Killanin
- Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, USA,College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Christine M Embury
- Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, USA,Department of Psychology, University of Nebraska Omaha, Omaha, NE 68182, USA
| | - Giorgia Picci
- Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, USA
| | | | - Yu-Ping Wang
- Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Vince D Calhoun
- Tri-Institutional Center for Translational Research in Neuroimaging and Data Science (TReNDS), Georgia State University, Georgia Institute of Technology, Emory University, Atlanta, GA 30303, USA
| | | | - Tony W Wilson
- Corresponding author: Tony W. Wilson, Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE 68010, USA.
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8
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Koshy SM, Wiesman AI, Spooner RK, Embury C, Rezich MT, Heinrichs-Graham E, Wilson TW. Multielectrode Transcranial Electrical Stimulation of the Left and Right Prefrontal Cortices Differentially Impacts Verbal Working Memory Neural Circuitry. Cereb Cortex 2021; 30:2389-2400. [PMID: 31799616 DOI: 10.1093/cercor/bhz246] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Recent studies have examined the effects of conventional transcranial direct current stimulation (tDCS) on working memory (WM) performance, but this method has relatively low spatial precision and generally involves a reference electrode that complicates interpretation. Herein, we report a repeated-measures crossover study of 25 healthy adults who underwent multielectrode tDCS of the left dorsolateral prefrontal cortex (DLPFC), right DLPFC, or sham in 3 separate visits. Shortly after each stimulation session, participants performed a verbal WM (VWM) task during magnetoencephalography, and the resulting data were examined in the time-frequency domain and imaged using a beamformer. We found that after left DLPFC stimulation, participants exhibited stronger responses across a network of left-lateralized cortical areas, including the supramarginal gyrus, prefrontal cortex, inferior frontal gyrus, and cuneus, as well as the right hemispheric homologues of these regions. Importantly, these effects were specific to the alpha-band, which has been previously implicated in VWM processing. Although stimulation condition did not significantly affect performance, stepwise regression revealed a relationship between reaction time and response amplitude in the left precuneus and supramarginal gyrus. These findings suggest that multielectrode tDCS targeting the left DLPFC affects the neural dynamics underlying offline VWM processing, including utilization of a more extensive bilateral cortical network.
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Affiliation(s)
- Sam M Koshy
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Alex I Wiesman
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Rachel K Spooner
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Christine Embury
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA.,Department of Psychology, University of Nebraska Omaha, Omaha, NE 68182, USA
| | - Michael T Rezich
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Elizabeth Heinrichs-Graham
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Tony W Wilson
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
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9
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Xia F, Kheirbek MA. Circuit-Based Biomarkers for Mood and Anxiety Disorders. Trends Neurosci 2020; 43:902-915. [PMID: 32917408 PMCID: PMC7606349 DOI: 10.1016/j.tins.2020.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/23/2020] [Accepted: 08/16/2020] [Indexed: 12/11/2022]
Abstract
Mood and anxiety disorders are complex heterogeneous syndromes that manifest in dysfunctions across multiple brain regions, cell types, and circuits. Biomarkers using brain-wide activity patterns in humans have proven useful in distinguishing between disorder subtypes and identifying effective treatments. In order to improve biomarker identification, it is crucial to understand the basic circuitry underpinning brain-wide activity patterns. Leveraging a large repertoire of techniques, animal studies have examined roles of specific cell types and circuits in driving maladaptive behavior. Recent advances in multiregion recording techniques, data-driven analysis approaches, and machine-learning-based behavioral analysis tools can further push the boundary of animal studies and bridge the gap with human studies, to assess how brain-wide activity patterns encode and drive emotional behavior. Together, these efforts will allow identifying more precise biomarkers to enhance diagnosis and treatment.
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Affiliation(s)
- Frances Xia
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA, USA; Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, USA.
| | - Mazen A Kheirbek
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA, USA; Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, USA; Neuroscience Graduate Program, University of California, San Francisco, San Francisco, CA, USA.; Kavli Institute for Fundamental Neuroscience, University of California, San Francisco, San Francisco, CA, USA; Center for Integrative Neuroscience, University of California, San Francisco, San Francisco, CA, USA.
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10
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Koshy SM, Wiesman AI, Proskovec AL, Embury CM, Schantell MD, Eastman JA, Heinrichs-Graham E, Wilson TW. Numerical working memory alters alpha-beta oscillations and connectivity in the parietal cortices. Hum Brain Mapp 2020; 41:3709-3719. [PMID: 32459874 PMCID: PMC7416044 DOI: 10.1002/hbm.25043] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 05/06/2020] [Accepted: 05/10/2020] [Indexed: 12/30/2022] Open
Abstract
Although the neural bases of numerical processing and memory have been extensively studied, much remains to be elucidated concerning the spectral and temporal dynamics surrounding these important cognitive processes. To further this understanding, we employed a novel numerical working memory paradigm in 28 young, healthy adults who underwent magnetoencephalography (MEG). The resulting data were examined in the time-frequency domain prior to image reconstruction using a beamformer. Whole-brain, spectrally-constrained coherence was also employed to determine network connectivity. In response to the numerical task, participants exhibited robust alpha/beta oscillations in the bilateral parietal cortices. Whole-brain statistical comparisons examining the effect of numerical manipulation during memory-item maintenance revealed a difference centered in the right superior parietal cortex, such that oscillatory responses during numerical manipulation were significantly stronger than when no manipulation was necessary. Additionally, there was significantly reduced cortico-cortical coherence between the right and left superior parietal regions during the manipulation compared to the maintenance trials, indicating that these regions were functioning more independently when the numerical information had to be actively processed. In sum, these results support previous studies that have implicated the importance of parietal regions in numerical processing, but also provide new knowledge on the spectral, temporal, and network dynamics that serve this critical cognitive function during active working memory maintenance.
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Affiliation(s)
- Sam M Koshy
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA
| | - Alex I Wiesman
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Neurological Sciences, UNMC, Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA
| | - Amy L Proskovec
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Psychology, University of Nebraska Omaha, Omaha, Nebraska, USA
| | - Christine M Embury
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA.,Department of Psychology, University of Nebraska Omaha, Omaha, Nebraska, USA
| | - Mikki D Schantell
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Neurological Sciences, UNMC, Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA
| | - Jacob A Eastman
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Neurological Sciences, UNMC, Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA
| | - Elizabeth Heinrichs-Graham
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Neurological Sciences, UNMC, Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA
| | - Tony W Wilson
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska, USA.,Department of Neurological Sciences, UNMC, Omaha, Nebraska, USA.,Cognitive Neuroscience of Development & Aging (CoNDA) Center, UNMC, Omaha, Nebraska, USA
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11
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Kube T, Berg M, Kleim B, Herzog P. Rethinking post-traumatic stress disorder - A predictive processing perspective. Neurosci Biobehav Rev 2020; 113:448-460. [PMID: 32315695 DOI: 10.1016/j.neubiorev.2020.04.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 04/07/2020] [Accepted: 04/09/2020] [Indexed: 12/15/2022]
Abstract
Predictive processing has become a popular framework in neuroscience and computational psychiatry, where it has provided a new understanding of various mental disorders. Here, we apply the predictive processing account to post-traumatic stress disorder (PTSD). We argue that the experience of a traumatic event in Bayesian terms can be understood as a perceptual hypothesis that is subsequently given a very high a-priori likelihood due to its (life-) threatening significance; thus, this hypothesis is re-selected although it does not fit the actual sensory input. Based on this account, we re-conceptualise the symptom clusters of PTSD through the lens of a predictive processing model. We particularly focus on re-experiencing symptoms as the hallmark symptoms of PTSD, and discuss the occurrence of flashbacks in terms of perceptual and interoceptive inference. This account provides not only a new understanding of the clinical profile of PTSD, but also a unifying framework for the corresponding pathologies at the neurobiological level. Finally, we derive directions for future research and discuss implications for psychological and pharmacological interventions.
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Affiliation(s)
- Tobias Kube
- Harvard Medical School, Program in Placebo Studies, Beth Israel Deaconess Medical Center, Brookline Avenue 330, Boston, MA, 02115, USA; University of Koblenz-Landau, Pain and Psychotherapy Research Lab, Ostbahnstr. 10, 76829 Landau, Germany.
| | - Max Berg
- Philipps-University of Marburg, Department of Psychology, Division of Clinical Psychology and Psychological Treatment Gutenbergstraße 18, D-35032, Marburg, Germany
| | - Birgit Kleim
- University of Zurich, Department of Psychology, Binzmühlestrasse 14, Box 8, CH-8050, Zurich, Switzerland; Psychiatric University Hospital (PUK), Lenggstrasse 31, CH-8032, Zurich, Switzerland
| | - Philipp Herzog
- Philipps-University of Marburg, Department of Psychology, Division of Clinical Psychology and Psychological Treatment Gutenbergstraße 18, D-35032, Marburg, Germany; University of Greifswald, Department of Psychology, Clinical Psychology and Psychotherapy, Franz-Mehring-Straße 47, D-17489, Greifswald, Germany; Department of Psychiatry and Psychotherapy, University of Lübeck, Ratzeburger Allee 160, D-23562, Lübeck, Germany
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12
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Dunkley BT, Jetly R, Pang EW, Taylor MJ. New perspectives on the neurobiology of PTSD: High-resolution imaging of neural circuit (dys)function with magnetoencephalography. JOURNAL OF MILITARY, VETERAN AND FAMILY HEALTH 2020. [DOI: 10.3138/jmvfh.2019-0029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Introduction: Combat-related posttraumatic stress disorder (PTSD) is increasingly conceptualized in psychiatry as a disorder of dysfunctional neural circuits. Advances in neuroimaging have enabled the study of those networks non-invasively. PTSD is currently assessed using subjective self-reporting to inform crucial decisions, such as fitness to deploy, but objective markers would aid in diagnosis and return-to-deployment decisions. Methods: Magnetoencephalography (MEG) allows investigation of neural circuit function via imaging of brain waves (known as neural oscillations) that index information processing in the brain and would prove a reliable, objective, biomarker. These measures of brain function establish how regions communicate to form brain circuits that support thinking and behaviour. Results: Studies into intrinsic brain function, both during rest and when engaged in a task designed to tap into cognitive dysfunction, have found these neurobiological mechanisms are disrupted in PTSD and are a reliable objective marker of illness. We now know that these alterations in brain function are directly related to core symptoms of PTSD and comorbid cognitive-behavioural challenges. Discussion: Continued characterization of neural function using MEG and related methods will advance understanding of the neurobiology underlying PTSD; allow for the identification of biomarkers that, coupled with machine learning, will aid in diagnoses; provide individualized therapeutic targets for neurostimulation; predict treatment outcomes; and track disorder remission in military personnel and Veterans who are disproportionately affected by this devastating illness.
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Affiliation(s)
- Benjamin T. Dunkley
- Department of Diagnostic Imaging, The Hospital for Sick Children (SickKids), Toronto
- Neurosciences & Mental Health, The Hospital for Sick Children (SickKids) Research Institute, Toronto
- Department of Medical Imaging, University of Toronto, Toronto
- Department of National Defence, Canadian Forces Health Services Group, Department of National Defence, Ottawa
- Division of Neurology, The Hospital for Sick Children (SickKids), Toronto
| | - Rakesh Jetly
- Department of Diagnostic Imaging, The Hospital for Sick Children (SickKids), Toronto
- Neurosciences & Mental Health, The Hospital for Sick Children (SickKids) Research Institute, Toronto
- Department of Medical Imaging, University of Toronto, Toronto
- Department of National Defence, Canadian Forces Health Services Group, Department of National Defence, Ottawa
- Division of Neurology, The Hospital for Sick Children (SickKids), Toronto
| | - Elizabeth W. Pang
- Department of Diagnostic Imaging, The Hospital for Sick Children (SickKids), Toronto
- Neurosciences & Mental Health, The Hospital for Sick Children (SickKids) Research Institute, Toronto
- Department of Medical Imaging, University of Toronto, Toronto
- Department of National Defence, Canadian Forces Health Services Group, Department of National Defence, Ottawa
- Division of Neurology, The Hospital for Sick Children (SickKids), Toronto
| | - Margot J. Taylor
- Department of Diagnostic Imaging, The Hospital for Sick Children (SickKids), Toronto
- Neurosciences & Mental Health, The Hospital for Sick Children (SickKids) Research Institute, Toronto
- Department of Medical Imaging, University of Toronto, Toronto
- Department of National Defence, Canadian Forces Health Services Group, Department of National Defence, Ottawa
- Division of Neurology, The Hospital for Sick Children (SickKids), Toronto
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Metcalf O, Stone C, Hinton M, O’Donnell M, Hopwood M, McFarlane A, Forbes D, Kartal D, Watson L, Freijah I, Varker T. Treatment augmentation for posttraumatic stress disorder: A systematic review. CLINICAL PSYCHOLOGY-SCIENCE AND PRACTICE 2019. [DOI: 10.1111/cpsp.12310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olivia Metcalf
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Caleb Stone
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Mark Hinton
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Meaghan O’Donnell
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Malcolm Hopwood
- Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Alexander McFarlane
- Centre for Traumatic Stress Studies University of Adelaide Adelaide SA Australia
| | - David Forbes
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Dzenana Kartal
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Loretta Watson
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Isabella Freijah
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
| | - Tracey Varker
- Phoenix Australia ‐ Centre for Posttraumatic Mental Health Department of Psychiatry University of Melbourne Carlton VIC Australia
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Abstract
Eye Movement Desensitization and Reprocessing Therapy (EMDR) is an effective treatment for Post-traumatic Stress Disorder (PTSD). The Adaptive Information Processing Model (AIP) guides the development and practice of EMDR. The AIP postulates inadequately processed memory as the foundation of PTSD pathology. Predictive Processing postulates that the primary function of the brain is prediction that serves to anticipate the next moment of experience in order to resist the dissipative force of entropy thus facilitating continued survival. Memory is the primary substrate of prediction, and is optimized by an ongoing process of precision weighted prediction error minimization that refines prediction by updating the memories on which it is based. The Predictive Processing model of EMDR postulates that EMDR facilitates the predictive processing of traumatic memory by overcoming the bias against exploration and evidence accumulation. The EMDR protocol brings the traumatic memory into an active state of re-experiencing. Defensive responding and/or low sensory precision preclude evidence accumulation to test the predictions of the traumatic memory in the present. Sets of therapist guided eye movements repeatedly challenge the bias against evidence accumulation and compel sensory sampling of the benign present. Eye movements reset the theta rhythm organizing the flow of information through the brain, facilitating the deployment of both overt and covert attention, and the mnemonic search for associations. Sampling of sensation does not support the predictions of the traumatic memory resulting in prediction error that the brain then attempts to minimize. The net result is a restoration of the integrity of the rhythmic deployment of attention, a recalibration of sensory precision, and the updating (reconsolidation) of the traumatic memory. Thus one prediction of the model is a decrease in Attention Bias Variability, a core dysfunction in PTSD, following successful treatment with EMDR.
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Fu S, Ma X, Li C, Wang T, Li C, Bai Z, Hua K, Yin Y, Wu Y, Yu K, Liu M, Ke Q, Tian J, Jiang G. Aberrant regional homogeneity in post-traumatic stress disorder after traffic accident: A resting-state functional MRI study. Neuroimage Clin 2019; 24:101951. [PMID: 31374398 PMCID: PMC6676011 DOI: 10.1016/j.nicl.2019.101951] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/23/2019] [Accepted: 07/19/2019] [Indexed: 10/31/2022]
Abstract
OBJECTIVES The present study explored the changes in spontaneous regional activity in post-traumatic stress disorder (PTSD) patients, who experienced severe traffic accidents. METHODS 20 drug-naive PTSD patients and 18 healthy control subjects were imaged using resting-state functional magnetic resonance imaging (rs-fMRI) and analyzed by the algorithm of regional homogeneity (ReHo). RESULTS Compared to the healthy control group, the PTSD group showed decreased ReHo values in the right angular gyrus. In addition, a negative correlation was found between the activity level of the angular gyrus and the CAPS score. CONCLUSION The dysfunctions were found in the memory- and emotion-related areas, suggested a possible mechanism of memory dysregulation that might be related to the intrusive memory symptoms of PTSD. These results provided imaging evidence that might provide an in-depth understanding of the intrinsic functional architecture of PTSD.
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Affiliation(s)
- Shishun Fu
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China
| | - Xiaofen Ma
- The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Changhong Li
- The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Tianyue Wang
- The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Chao Li
- The First Affiliated Hospital of China Medical University, People's Republic of China
| | - Zhigang Bai
- The Affiliated Hospital of Inner Mongolia Medical University, People's Republic of China
| | - Kelei Hua
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Yi Yin
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Yunfan Wu
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Kanghui Yu
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China
| | - Mengchen Liu
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China
| | - Qiying Ke
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China
| | - Junzhang Tian
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China.
| | - Guihua Jiang
- The Second School of Clinical Medicine, Southern Medical University, People's Republic of China; The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, People's Republic of China.
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16
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Wilson TW, Lew BJ, Spooner RK, Rezich MT, Wiesman AI. Aberrant brain dynamics in neuroHIV: Evidence from magnetoencephalographic (MEG) imaging. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2019; 165:285-320. [PMID: 31481167 DOI: 10.1016/bs.pmbts.2019.04.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Magnetoencephalography (MEG) is a noninvasive, silent, and totally passive neurophysiological imaging method with excellent temporal resolution (~1ms) and good spatial precision (~3-5mm). While MEG studies of neuroHIV remain relatively rare, the number of studies per year has sharply increased recently and this trend will likely continue into the foreseeable future. The current in-depth review focuses on the studies that have been conducted to date, which include investigations of somatosensory and visual modalities, resting-state, as well as motor control and higher-level functions such as working memory and visual attention. The review begins with an introduction to the principles and methods of MEG, and then transitions to a review of each of the empirical studies that have been conducted to date, separated by sensory modality for the basic studies and cognitive domain for the higher-level investigations. As such, this review attempts to be exhaustive in its coverage of empirical MEG studies of neuroHIV. Across studies major themes emerge including aberrant neural oscillatory activity in HIV-infected adults, both in primary sensory regions of the brain and higher-order executive regions. Many studies have also connected the amplitude of neural oscillations to behavioral and/or neuropsychological function in the study population, making a vital connection to performance and improving the veracity of the findings. One conspicuous emerging area is the use of MEG to distinguish cognitively-impaired from unimpaired HIV-infected adults, with major success reported and future studies sure to come. The review concludes with a summary of findings and suggested focus areas for future studies.
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Affiliation(s)
- Tony W Wilson
- Department of Neurological Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE, United States; Center for Magnetoencephalography, UNMC, Omaha, NE, United States.
| | - Brandon J Lew
- Department of Neurological Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE, United States; Center for Magnetoencephalography, UNMC, Omaha, NE, United States
| | - Rachel K Spooner
- Department of Neurological Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE, United States; Center for Magnetoencephalography, UNMC, Omaha, NE, United States
| | - Michael T Rezich
- Department of Neurological Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE, United States; Center for Magnetoencephalography, UNMC, Omaha, NE, United States
| | - Alex I Wiesman
- Department of Neurological Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE, United States; Center for Magnetoencephalography, UNMC, Omaha, NE, United States
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17
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Forbes D, Pedlar D, Adler AB, Bennett C, Bryant R, Busuttil W, Cooper J, Creamer MC, Fear NT, Greenberg N, Heber A, Hinton M, Hopwood M, Jetly R, Lawrence-Wood E, McFarlane A, Metcalf O, O'Donnell M, Phelps A, Richardson JD, Sadler N, Schnurr PP, Sharp ML, Thompson JM, Ursano RJ, Hooff MV, Wade D, Wessely S. Treatment of military-related post-traumatic stress disorder: challenges, innovations, and the way forward. Int Rev Psychiatry 2019; 31:95-110. [PMID: 31043106 DOI: 10.1080/09540261.2019.1595545] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Post-traumatic stress disorder (PTSD) is one of the common mental disorders in military and veteran populations. Considerable research and clinical opinion has been focused on understanding the relationship between PTSD and military service and the implications for prevention, treatment, and management. This paper examines factors associated with the development of PTSD in this population, considers issues relating to engagement in treatment, and discusses the empirical support for best practice evidence-based treatment. The paper goes on to explore the challenges in those areas, with particular reference to treatment engagement and barriers to care, as well as treatment non-response. The final section addresses innovative solutions to these challenges through improvements in agreed terminology and definitions, strategies to increase engagement, early identification approaches, understanding predictors of treatment outcome, and innovations in treatment. Treatment innovations include enhancing existing treatments, emerging non-trauma-focused interventions, novel pharmacotherapy, personalized medicine approaches, advancing functional outcomes, family intervention and support, and attention to physical health.
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Affiliation(s)
- David Forbes
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - David Pedlar
- b Canadian Institute for Military and Veteran Health Research , Kingston , ON, Canada
| | - Amy B Adler
- c Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research , Silver Spring , MD , USA
| | - Clare Bennett
- d New Zealand Defence Force , Wellington , New Zealand
| | - Richard Bryant
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia.,e School of Psychology , University of New South Wales , Sydney , Australia
| | | | - John Cooper
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Mark C Creamer
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Nicola T Fear
- g King's Centre for Military Health Research, King's College London , London , UK.,h Academic Centre for Military Mental Health Research , London , UK
| | - Neil Greenberg
- g King's Centre for Military Health Research, King's College London , London , UK
| | - Alexandra Heber
- i Veterans Affairs Canada , Charlottetown , Canada.,j Department of Psychiatry , University of Ottawa , Ottawa , Canada
| | - Mark Hinton
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Mal Hopwood
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Rakesh Jetly
- k Directorate of Mental Health , Canadian Armed Forces , Ottawa , Canada
| | - Ellie Lawrence-Wood
- l Centre for Traumatic Stress Studies , University of Adelaide , Adelaide , Australia
| | - Alexander McFarlane
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia.,l Centre for Traumatic Stress Studies , University of Adelaide , Adelaide , Australia
| | - Olivia Metcalf
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Meaghan O'Donnell
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Andrea Phelps
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - J Don Richardson
- m Department of Psychiatry , Western University , London , Canada.,n McDonald/Franklin OSI Research Centre , London , Canada
| | - Nicole Sadler
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Paula P Schnurr
- o National Center for PTSD , White River Junction , VT , USA.,p Department of Psychiatry , Geisel School of Medicine , Hanover , NH , USA
| | - Marie-Louise Sharp
- g King's Centre for Military Health Research, King's College London , London , UK
| | - James M Thompson
- i Veterans Affairs Canada , Charlottetown , Canada.,q Department of Public Health Sciences , Queen's University , Kingston , ON , Canada
| | - Robert J Ursano
- r Center for the Study of Traumatic Stress, Department of Psychiatry , Uniformed Services University School of Medicine , Bethesda , MD , USA
| | - Miranda Van Hooff
- l Centre for Traumatic Stress Studies , University of Adelaide , Adelaide , Australia
| | - Darryl Wade
- a Centenary of Anzac Centre, Phoenix Australia-Centre for Posttraumatic Mental Health, Department of Psychiatry , University of Melbourne , Carlton , Australia
| | - Simon Wessely
- g King's Centre for Military Health Research, King's College London , London , UK
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Proskovec AL, Heinrichs-Graham E, Wilson TW. Load modulates the alpha and beta oscillatory dynamics serving verbal working memory. Neuroimage 2018; 184:256-265. [PMID: 30213775 DOI: 10.1016/j.neuroimage.2018.09.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 09/05/2018] [Accepted: 09/07/2018] [Indexed: 11/17/2022] Open
Abstract
A network of predominantly left-lateralized brain regions has been linked to verbal working memory (VWM) performance. However, the impact of memory load on the oscillatory dynamics serving VWM is far less understood. To further investigate this, we had 26 healthy adults perform a high-load (6 letter) and low-load (4 letter) variant of a VWM task while undergoing magnetoencephalography (MEG). MEG data were evaluated in the time-frequency domain and significant oscillatory responses spanning the encoding and maintenance phases were reconstructed using a beamformer. To determine the impact of load on the neural dynamics, the resulting images were examined using paired-samples t-tests and virtual sensor analyses. Our results indicated stronger increases in frontal theta activity in the high- relative to low-load condition during early encoding. Stronger decreases in alpha/beta activity were also observed during encoding in bilateral posterior cortices during the high-load condition, and the strength of these load effects increased as encoding progressed. During maintenance, stronger decreases in alpha activity in the left inferior frontal gyrus, middle temporal gyrus, supramarginal gyrus, and inferior parietal cortices were detected during high- relative to low-load performance, with the strength of these load effects remaining largely static throughout maintenance. Finally, stronger increases in occipital alpha activity were observed during maintenance in the high-load condition, and the strength of these effects grew stronger with time during the first half of maintenance, before dissipating during the latter half of maintenance. Notably, this was the first study to utilize a whole-brain approach to statistically evaluate the temporal dynamics of load-related oscillatory differences during encoding and maintenance processes, and our results highlight the importance of spatial, temporal, and spectral specificity in this regard.
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Affiliation(s)
- Amy L Proskovec
- Department of Psychology, University of Nebraska Omaha, Omaha, NE, USA; Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Elizabeth Heinrichs-Graham
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Tony W Wilson
- Department of Psychology, University of Nebraska Omaha, Omaha, NE, USA; Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Neurological Sciences, UNMC, Omaha, NE, USA.
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19
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Worse baseline executive functioning is associated with dropout and poorer response to trauma-focused treatment for veterans with PTSD and comorbid traumatic brain injury. Behav Res Ther 2018; 108:68-77. [DOI: 10.1016/j.brat.2018.07.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/28/2018] [Accepted: 07/13/2018] [Indexed: 11/23/2022]
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20
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Embury CM, Wiesman AI, Proskovec AL, Heinrichs-Graham E, McDermott TJ, Lord GH, Brau KL, Drincic AT, Desouza CV, Wilson TW. Altered Brain Dynamics in Patients With Type 1 Diabetes During Working Memory Processing. Diabetes 2018; 67. [PMID: 29531139 PMCID: PMC5961408 DOI: 10.2337/db17-1382] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
It is now generally accepted that diabetes increases the risk for cognitive impairment, but the precise mechanisms are poorly understood. A critical problem in linking diabetes to cognitive impairment is that patients often have multiple comorbidities (e.g., obesity, hypertension) that have been independently linked to cognitive deficits. In the study reported here we focused on young adults with and without type 1 diabetes who were virtually free of such comorbidities. The two groups were matched on major health and demographic factors, and all participants completed a verbal working memory task during magnetoencephalographic brain imaging. We hypothesized that patients would have altered neural dynamics in verbal working memory processing and that these differences would directly relate to clinical disease measures. Accordingly, we found that patients had significantly stronger neural responses in the superior parietal cortices during memory encoding and significantly weaker activity in parietal-occipital regions during maintenance compared with control subjects. Moreover, disease duration and glycemic control were both significantly correlated with neural responses in various brain regions. In conclusion, young healthy adults with type 1 diabetes already have aberrant neural processing relative to their peers without diabetes, using compensatory responses to perform the task, and glucose management and duration may play a central role.
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Affiliation(s)
- Christine M Embury
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
- Department of Psychology, University of Nebraska Omaha, Omaha, NE
| | - Alex I Wiesman
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
| | - Amy L Proskovec
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
- Department of Psychology, University of Nebraska Omaha, Omaha, NE
| | - Elizabeth Heinrichs-Graham
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
| | - Timothy J McDermott
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
| | - Grace H Lord
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Kaitlin L Brau
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Andjela T Drincic
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Cyrus V Desouza
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Tony W Wilson
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
- Center for Magnetoencephalography, University of Nebraska Medical Center, Omaha, NE
- Department of Psychology, University of Nebraska Omaha, Omaha, NE
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21
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Cognitive Training for Military Application: a Review of the Literature and Practical Guide. JOURNAL OF COGNITIVE ENHANCEMENT 2018. [DOI: 10.1007/s41465-018-0076-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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22
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Badura-Brack A, McDermott TJ, Becker KM, Ryan TJ, Khanna MM, Pine DS, Bar-Haim Y, Heinrichs-Graham E, Wilson TW. Attention training modulates resting-state neurophysiological abnormalities in posttraumatic stress disorder. Psychiatry Res 2018; 271:135-141. [PMID: 29174765 PMCID: PMC5741514 DOI: 10.1016/j.pscychresns.2017.11.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 11/02/2017] [Accepted: 11/12/2017] [Indexed: 12/12/2022]
Abstract
Recent research indicates the relative benefits of computerized attention control treatment (ACT) and attention bias modification treatment (ABMT) for posttraumatic stress disorder (PTSD); however, neural changes underlying these therapeutic effects remain unknown. This study examines how these two types of attention training modulate neurological dysfunction in veterans with PTSD. A community sample of 46 combat veterans with PTSD participated in a randomized double-blinded clinical trial of ACT versus ABMT and 32 of those veterans also agreed to undergo resting-state magnetoencephalography (MEG) recordings. Twenty-four veterans completed psychological and MEG assessments at pre- and post-training to evaluate treatment effects. MEG data were imaged using an advanced Bayesian reconstruction method and examined using statistical parametric mapping. In this report, we focus on the neural correlates and the differential treatment effects observed using MEG; the results of the full clinical trial have been described elsewhere. Our results indicated that ACT modulated occipital and ABMT modulated medial temporal activity more strongly than the comparative treatment. PTSD symptoms decreased significantly from pre- to post-test. These initial neurophysiological outcome data suggest that ACT modulates visual pathways, while ABMT modulates threat-processing regions, but that both are associated with normalizing aberrant neural activity in veterans with PTSD.
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Affiliation(s)
- Amy Badura-Brack
- Department of Psychology, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA.
| | - Timothy J McDermott
- Department of Psychology, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA; Center for Magnetoencephalography (MEG), University of Nebraska Medical Center (UNMC), Omaha, NE, USA
| | - Katherine M Becker
- Center for Magnetoencephalography (MEG), University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Psychology, Colorado State University, Fort Collins, CO, USA
| | - Tara J Ryan
- Department of Psychology, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA; Department of Psychology, Simon Fraser University, Burnaby, BC, Canada
| | - Maya M Khanna
- Department of Psychology, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA
| | - Daniel S Pine
- Intramural Research Program, National Institute of Mental Health, Bethesda, MD, USA
| | - Yair Bar-Haim
- School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel; The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Elizabeth Heinrichs-Graham
- Center for Magnetoencephalography (MEG), University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Tony W Wilson
- Center for Magnetoencephalography (MEG), University of Nebraska Medical Center (UNMC), Omaha, NE, USA; Department of Neurological Sciences, UNMC, Omaha, NE, USA
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23
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Khanna MM, Badura-Brack AS, McDermott TJ, Embury CM, Wiesman AI, Shepherd A, Ryan TJ, Heinrichs-Graham E, Wilson TW. Veterans with post-traumatic stress disorder exhibit altered emotional processing and attentional control during an emotional Stroop task. Psychol Med 2017; 47:2017-2027. [PMID: 28478767 PMCID: PMC5831077 DOI: 10.1017/s0033291717000460] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Post-traumatic stress disorder (PTSD) is often associated with attention allocation and emotional regulation difficulties, but the brain dynamics underlying these deficits are unknown. The emotional Stroop task (EST) is an ideal means to monitor these difficulties, because participants are asked to attend to non-emotional aspects of the stimuli. In this study, we used magnetoencephalography (MEG) and the EST to monitor attention allocation and emotional regulation during the processing of emotionally charged stimuli in combat veterans with and without PTSD. METHOD A total of 31 veterans with PTSD and 20 without PTSD performed the EST during MEG. Three categories of stimuli were used, including combat-related, generally threatening and neutral words. MEG data were imaged in the time-frequency domain and the network dynamics were probed for differences in processing threatening and non-threatening words. RESULTS Behaviorally, veterans with PTSD were significantly slower in responding to combat-related relative to neutral and generally threatening words. Veterans without PTSD exhibited no significant differences in responding to the three different word types. Neurophysiologically, we found a significant three-way interaction between group, word type and time period across multiple brain regions. Follow-up testing indicated stronger theta-frequency (4-8 Hz) responses in the right ventral prefrontal (0.4-0.8 s) and superior temporal cortices (0.6-0.8 s) of veterans without PTSD compared with those with PTSD during the processing of combat-related words. CONCLUSIONS Our data indicated that veterans with PTSD exhibited deficits in attention allocation and emotional regulation when processing trauma cues, while those without PTSD were able to regulate emotion by directing attention away from threat.
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Affiliation(s)
- Maya M. Khanna
- Department of Psychology, Creighton University, Omaha, NE, USA
| | | | - Timothy J. McDermott
- Department of Psychology, Creighton University, Omaha, NE, USA
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Christine M. Embury
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Alex I. Wiesman
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Alex Shepherd
- Department of Psychology, Creighton University, Omaha, NE, USA
- Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY, USA
| | - Tara J. Ryan
- Department of Psychology, Creighton University, Omaha, NE, USA
- Department of Psychology, Simon Fraser University, Burnaby, BC, Canada
| | - Elizabeth Heinrichs-Graham
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Neurological Sciences, UNMC, Omaha, NE, USA
| | - Tony W. Wilson
- Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Neurological Sciences, UNMC, Omaha, NE, USA
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Aberrant Neuronal Dynamics during Working Memory Operations in the Aging HIV-Infected Brain. Sci Rep 2017; 7:41568. [PMID: 28155864 PMCID: PMC5290733 DOI: 10.1038/srep41568] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 12/20/2016] [Indexed: 11/08/2022] Open
Abstract
Impairments in working memory are among the most prevalent features of HIV-associated neurocognitive disorders (HAND), yet their origins are unknown, with some studies arguing that encoding operations are disturbed and others supporting deficits in memory maintenance. The current investigation directly addresses this issue by using a dynamic mapping approach to identify when and where processing in working memory circuits degrades. HIV-infected older adults and a demographically-matched group of uninfected controls performed a verbal working memory task during magnetoencephalography (MEG). Significant oscillatory neural responses were imaged using a beamforming approach to illuminate the spatiotemporal dynamics of neuronal activity. HIV-infected patients were significantly less accurate on the working memory task and their neuronal dynamics indicated that encoding operations were preserved, while memory maintenance processes were abnormal. Specifically, no group differences were detected during the encoding period, yet dysfunction in occipital, fronto-temporal, hippocampal, and cerebellar cortices emerged during memory maintenance. In addition, task performance in the controls covaried with occipital alpha synchronization and activity in right prefrontal cortices. In conclusion, working memory impairments are common and significantly impact the daily functioning and independence of HIV-infected patients. These impairments likely reflect deficits in the maintenance of memory representations, not failures to adequately encode stimuli.
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