Recent studies suggest a possible link between post-traumatic stress disorder (PTSD) and obesity ... more Recent studies suggest a possible link between post-traumatic stress disorder (PTSD) and obesity risk, which would have implications for the development of obesity-related diseases in this population. The present study examined the association between PTSD and obesity and whether this association differed by sex in a representative sample of the US population. A secondary objective was to determine whether the
Opioid-mediated analgesia develops in experimental animals after traumatic stress, and increased ... more Opioid-mediated analgesia develops in experimental animals after traumatic stress, and increased opioid-mediated analgesia has been observed in combat veterans with posttraumatic stress disorder (PTSD). These observations have led to the hypothesis that increased central nervous system (CNS) opioidergic activity exists in patients with PTSD. However, direct CNS data on opioid peptide concentrations and dynamics in patients with PTSD are lacking.
Pervasive use of improvised explosive devices (IEDs), rocket-propelled grenades, and land mines i... more Pervasive use of improvised explosive devices (IEDs), rocket-propelled grenades, and land mines in the recent conflicts in Iraq and Afghanistan has brought traumatic brain injury (TBI) and its impact on health outcomes into public awareness. Blast injuries have been deemed signature wounds of these wars. War-related TBI is not new, having become prevalent during WWI and remaining medically relevant in WWII and beyond. Medicine's past attempts to accurately diagnose and disentangle the pathophysiology of war-related TBI parallels current lines of inquiry and highlights limitations in methodology and attribution of symptom etiology, be it organic, psychological, or behavioral. New approaches and biomarkers are needed. Serological biomarkers and biomarkers of injury obtained with imaging techniques represent cornerstones in the translation between experimental data and clinical observations. Experimental models for blast related TBI and PTSD can generate critical data on injury threshold, for example for white matter injury from acceleration. Carefully verified and validated models can be evaluated with gene expression arrays and proteomics to identify new candidates for serological biomarkers. Such models can also be analyzed with diffusion MRI and microscopy in order to identify criteria for detection of diffuse white matter injuries, such as DAI (diffuse axonal injury). The experimental models can also be analyzed with focus on injury outcome in brain stem regions, such as locus coeruleus or nucleus raphe magnus that can be involved in response to anxiety changes. Mild (and some moderate) TBI can be difficult to diagnose because the injuries are often not detectable on conventional MRI or CT. There is accumulating evidence that injured brain tissues in TBI patients generate abnormal low-frequency magnetic activity (ALFMA, peaked at 1-4Hz) that can be measured and localized by magnetoencephalography (MEG). MEG imaging detects TBI abnormalities at the rates of 87% for the mild TBI, group (blast-induced plus non-blast causes) and 100% for the moderate group. Among the mild TBI patients, the rates of abnormalities are 96% and 77% for the blast and non-blast TBI groups, respectively. There is emerging evidence based on fMRI and MEG studies showing hyper-activity in the amygdala and hypo-activity in pre-frontal cortex in individuals with PTSD. MEG signal may serve as a sensitive imaging marker for mTBI, distinguishable from abnormalities generated in association with PTSD. More work is needed to fully describe physiological mechanisms of post-concussive symptoms.
Dopamine beta-hydroxylase (DBH) is the biosynthetic enzyme catalyzing formation of norepinephrine... more Dopamine beta-hydroxylase (DBH) is the biosynthetic enzyme catalyzing formation of norepinephrine. Changes in DBH expression or activity have been implicated in the pathogenesis of cardiovascular and neuropsychiatric disorders. Genetic determination of DBH enzymatic activity and its secretion are only incompletely understood. We began with a genome-wide association search for loci contributing to DBH activity in human plasma. Initially, in a population sample of European ancestry, we identified the proximal DBH promoter as a region harboring three common trait-determining variants (top hit rs1611115, P 5 7.2 3 10 251 ). We confirmed their effects on transcription and showed that the three variants each acted additively on gene expression. Results were replicated in a population sample of Native American descent (top hit rs1611115, P 5 4.1 3 10 215 ). Jointly, DBH variants accounted for 57% of DBH trait variation. We further identified a genome-wide significant SNP at the LOC338797 locus on chromosome 12 as trans-quantitative trait locus (QTL) (rs4255618, P 5 4.62 3 10 28 ). Conditional analyses on DBH identified a third genomic region contributing to DBH variation: a likely cis-QTL adjacent to DBH in SARDH (rs7040170, P 5 1.31 3 10 214 ) on chromosome 9q. We conclude that three common SNPs in the DBH promoter act additively to control phenotypic variation in DBH levels, and that two additional novel loci (SARDH and LOC338797) may also contribute to the expression of this catecholamine biosynthetic trait. Identification of DBH variants with strong effects makes it possible to take advantage of Mendelian randomization approaches to test causal effects of this intermediate trait on disease. *
Purpose Comorbid post-traumatic stress disorder (PTSD) and depression are often associated with n... more Purpose Comorbid post-traumatic stress disorder (PTSD) and depression are often associated with negative physical and mental health outcomes in Operation Enduring Freedom/Operation Iraqi Freedom (OEF/OIF) combat veterans. The current study examines the individual contributions of these two disorders on health-related quality of life (HRQoL) in an OEF/OIF cohort. The study hypothesizes that PTSD and depression will each significantly predict lower physical and mental HRQoL even when controlling for overlapping symptoms: anhedonia, concentration, and insomnia. Method Participants were 220 OEF/OIF combat veterans who completed an interview and self-report questionnaires examining study variables. All study hypotheses were tested with multiple regression analyses. Results PTSD and depression significantly contributed to mental and physical HRQoL, even after controlling for overlapping symptoms. However, while independent main effects of PTSD and depression, with and without overlapping symptoms, emerged for predicting mental HRQoL, no significant independent main effects emerged for predicting physical HRQoL. Conclusion Findings suggest PTSD and depression contribute uniquely to the negative relationship with HRQoL, adding to the growing literature on distinctive and common effects of these disorders in OEF/OIF veterans. Results highlight the need to better understand the implications for assessment and treatment.
We aimed to describe differences in combat experience for male and female veterans and characteri... more We aimed to describe differences in combat experience for male and female veterans and characterize differential effects on postdeployment physical and mental health symptoms, including aggression. Retrospective cross-sectional health screening data from 554 Operation Enduring Freedom and Operation Iraqi Freedom veterans who enrolled for Veterans Affairs health care in San Diego were examined including measures of combat experience, pain intensity, traumatic brain injury symptoms, military sexual trauma, post-traumatic stress disorder, depression, alcohol use, and aggression. Although male veterans (n = 458) experienced significantly higher rates of combat than female veterans (n = 96), both experienced similar levels of postdeployment post-traumatic stress disorder and depression symptoms as well self-reported aggressive behavior compared to male veterans. Female veterans had higher rates of military sexual trauma and lower alcohol consumption than male veterans. All Operation Enduring Freedom and Operation Iraqi Freedom veterans returning from deployment may benefit from broad-based screening of physical and mental health symptoms, beyond those currently mandated by Veterans Affairs, including anger and aggression.
for the Marine Resiliency Study Team IMPORTANCE Posttraumatic stress disorder (PTSD) has been ass... more for the Marine Resiliency Study Team IMPORTANCE Posttraumatic stress disorder (PTSD) has been associated in cross-sectional studies with peripheral inflammation. It is not known whether this observed association is the result of PTSD predisposing to inflammation (as sometimes postulated) or to inflammation predisposing to PTSD. OBJECTIVE To determine whether plasma concentration of the inflammatory marker C-reactive protein (CRP) helps predict PTSD symptoms.
Traumatic brain injury (TBI) is a leading cause of sustained impairment in military and civilian ... more Traumatic brain injury (TBI) is a leading cause of sustained impairment in military and civilian populations. However, mild TBI (mTBI) can be difficult to detect using conventional MRI or CT. Injured brain tissues in mTBI patients generate abnormal slow-waves (1-4 Hz) that can be measured and localized by resting-state magnetoencephalography (MEG). In this study, we develop a voxel-based whole-brain MEG slow-wave imaging approach for detecting abnormality in patients with mTBI on a single-subject basis. A normative database of resting-state MEG source magnitude images (1-4 Hz) from 79 healthy control subjects was established for all brain voxels. The high-resolution MEG source magnitude images were obtained by our recent Fast-VESTAL method. In 84 mTBI patients with persistent post-concussive symptoms (36 from blasts, and 48 from non-blast causes), our method detected abnormalities at the positive detection rates of 84.5%, 86.1%, and 83.3% for the combined (blast-induced plus with non-blast causes), blast, and non-blast mTBI groups, respectively. We found that prefrontal, posterior parietal, inferior temporal, hippocampus, and cerebella areas were particularly vulnerable to head trauma. The result also showed that MEG slow-wave generation in prefrontal areas positively correlated with personality change, trouble concentrating, affective lability, and depression symptoms. Discussion is provided regarding the neuronal mechanisms of MEG slow-wave generation due to deafferentation caused by axonal injury and/or blockages/limitations of cholinergic transmission in TBI. This study provides an effective way for using MEG slow-wave source imaging to localize affected areas and supports MEG as a tool for assisting the diagnosis of mTBI.
for the Marine Resiliency Study Team IMPORTANCE Whether traumatic brain injury (TBI) is a risk fa... more for the Marine Resiliency Study Team IMPORTANCE Whether traumatic brain injury (TBI) is a risk factor for posttraumatic stress disorder (PTSD) has been difficult to determine because of the prevalence of comorbid conditions, overlapping symptoms, and cross-sectional samples.
Background: Post-traumatic stress disorder (PTSD) and pain are highly comorbid. Objective: The pu... more Background: Post-traumatic stress disorder (PTSD) and pain are highly comorbid. Objective: The purpose of this study was to examine the association of PTSD with specific pain complaints in veterans of Operations Enduring and Iraqi Freedom (OEF/OIF). Method: A total of 381 primarily male (88.5%) veterans with a mean age of 30 years completed a battery of self-report questionnaires. A positive PTSD screen was defined as a score of Ն40 on the Davidson Trauma Scale. Logistic regression was used to examine the association of positive PTSD screen with specific pain complaints. Results: There were no significant demographic or physical and mental health differences between veterans who screened positive for PTSD only and those with PTSD and at least one pain complaint, although differences on rates of combat injury and depression approached significance. Veterans who screened positive for PTSD were 2 to 3 times more likely to report abdominal pain, muscle aches or cramps, and joint aches, even after controlling for age, gender, combat injury, and depression. Conclusions: Similar to findings in other populations, there is a relationship between PTSD and pain complaints in OEF/OIF veterans. Future research should examine the mechanisms that link PTSD with specific pain complaints, especially abdominal pain.
Background: Research on the etiology of post-traumatic stress disorder (PTSD) has rapidly matured... more Background: Research on the etiology of post-traumatic stress disorder (PTSD) has rapidly matured, moving from candidate gene studies to interrogation of the entire human genome in genome-wide association studies (GWAS). Here we present the results of a GWAS performed on samples from combat-exposed U.S. Marines and Sailors from the Marine Resiliency Study (MRS) scheduled for deployment to Iraq and/or Afghanistan. The MRS is a large, C.M. Nievergelt et al.
Post-traumatic stress disorder (PTSD) is a leading cause of sustained impairment, distress, and p... more Post-traumatic stress disorder (PTSD) is a leading cause of sustained impairment, distress, and poor quality of life in military personnel, veterans, and civilians. Indirect functional neuroimaging studies using PET or fMRI with fear-related stimuli support a PTSD neurocircuitry model that includes amygdala, hippocampus, and ventromedial prefrontal cortex (vmPFC). However, it is not clear if this model can fully account for PTSD abnormalities detected directly by electromagnetic-based source imaging techniques in resting-state. The present study examined resting-state magnetoencephalography (MEG) signals in 25 active-duty service members and veterans with PTSD and 30 healthy volunteers. In contrast to the healthy volunteers, individuals with PTSD showed: 1) hyperactivity from amygdala, hippocampus, posterolateral orbitofrontal cortex (OFC), dorsomedial prefrontal cortex (dmPFC), and insular cortex in high-frequency (i.e., beta, gamma, and high-gamma) bands; 2) hypoactivity from vmPFC, Frontal Pole (FP), and dorsolateral prefrontal cortex (dlPFC) in high-frequency bands; 3) extensive hypoactivity from dlPFC, FP, anterior temporal lobes, precuneous cortex, and sensorimotor cortex in alpha and low-frequency bands; and 4) in individuals with PTSD, MEG activity in the left amygdala and posterolateral OFC correlated positively with PTSD symptom scores, whereas MEG activity in vmPFC and precuneous correlated negatively with symptom score. The present study showed that MEG source imaging technique revealed new abnormalities in the resting-state electromagnetic signals from the PTSD neurocircuitry. Particularly, posterolateral OFC and precuneous may play important roles in the PTSD neurocircuitry model.
Recent studies suggest a possible link between post-traumatic stress disorder (PTSD) and obesity ... more Recent studies suggest a possible link between post-traumatic stress disorder (PTSD) and obesity risk, which would have implications for the development of obesity-related diseases in this population. The present study examined the association between PTSD and obesity and whether this association differed by sex in a representative sample of the US population. A secondary objective was to determine whether the
Opioid-mediated analgesia develops in experimental animals after traumatic stress, and increased ... more Opioid-mediated analgesia develops in experimental animals after traumatic stress, and increased opioid-mediated analgesia has been observed in combat veterans with posttraumatic stress disorder (PTSD). These observations have led to the hypothesis that increased central nervous system (CNS) opioidergic activity exists in patients with PTSD. However, direct CNS data on opioid peptide concentrations and dynamics in patients with PTSD are lacking.
Pervasive use of improvised explosive devices (IEDs), rocket-propelled grenades, and land mines i... more Pervasive use of improvised explosive devices (IEDs), rocket-propelled grenades, and land mines in the recent conflicts in Iraq and Afghanistan has brought traumatic brain injury (TBI) and its impact on health outcomes into public awareness. Blast injuries have been deemed signature wounds of these wars. War-related TBI is not new, having become prevalent during WWI and remaining medically relevant in WWII and beyond. Medicine's past attempts to accurately diagnose and disentangle the pathophysiology of war-related TBI parallels current lines of inquiry and highlights limitations in methodology and attribution of symptom etiology, be it organic, psychological, or behavioral. New approaches and biomarkers are needed. Serological biomarkers and biomarkers of injury obtained with imaging techniques represent cornerstones in the translation between experimental data and clinical observations. Experimental models for blast related TBI and PTSD can generate critical data on injury threshold, for example for white matter injury from acceleration. Carefully verified and validated models can be evaluated with gene expression arrays and proteomics to identify new candidates for serological biomarkers. Such models can also be analyzed with diffusion MRI and microscopy in order to identify criteria for detection of diffuse white matter injuries, such as DAI (diffuse axonal injury). The experimental models can also be analyzed with focus on injury outcome in brain stem regions, such as locus coeruleus or nucleus raphe magnus that can be involved in response to anxiety changes. Mild (and some moderate) TBI can be difficult to diagnose because the injuries are often not detectable on conventional MRI or CT. There is accumulating evidence that injured brain tissues in TBI patients generate abnormal low-frequency magnetic activity (ALFMA, peaked at 1-4Hz) that can be measured and localized by magnetoencephalography (MEG). MEG imaging detects TBI abnormalities at the rates of 87% for the mild TBI, group (blast-induced plus non-blast causes) and 100% for the moderate group. Among the mild TBI patients, the rates of abnormalities are 96% and 77% for the blast and non-blast TBI groups, respectively. There is emerging evidence based on fMRI and MEG studies showing hyper-activity in the amygdala and hypo-activity in pre-frontal cortex in individuals with PTSD. MEG signal may serve as a sensitive imaging marker for mTBI, distinguishable from abnormalities generated in association with PTSD. More work is needed to fully describe physiological mechanisms of post-concussive symptoms.
Dopamine beta-hydroxylase (DBH) is the biosynthetic enzyme catalyzing formation of norepinephrine... more Dopamine beta-hydroxylase (DBH) is the biosynthetic enzyme catalyzing formation of norepinephrine. Changes in DBH expression or activity have been implicated in the pathogenesis of cardiovascular and neuropsychiatric disorders. Genetic determination of DBH enzymatic activity and its secretion are only incompletely understood. We began with a genome-wide association search for loci contributing to DBH activity in human plasma. Initially, in a population sample of European ancestry, we identified the proximal DBH promoter as a region harboring three common trait-determining variants (top hit rs1611115, P 5 7.2 3 10 251 ). We confirmed their effects on transcription and showed that the three variants each acted additively on gene expression. Results were replicated in a population sample of Native American descent (top hit rs1611115, P 5 4.1 3 10 215 ). Jointly, DBH variants accounted for 57% of DBH trait variation. We further identified a genome-wide significant SNP at the LOC338797 locus on chromosome 12 as trans-quantitative trait locus (QTL) (rs4255618, P 5 4.62 3 10 28 ). Conditional analyses on DBH identified a third genomic region contributing to DBH variation: a likely cis-QTL adjacent to DBH in SARDH (rs7040170, P 5 1.31 3 10 214 ) on chromosome 9q. We conclude that three common SNPs in the DBH promoter act additively to control phenotypic variation in DBH levels, and that two additional novel loci (SARDH and LOC338797) may also contribute to the expression of this catecholamine biosynthetic trait. Identification of DBH variants with strong effects makes it possible to take advantage of Mendelian randomization approaches to test causal effects of this intermediate trait on disease. *
Purpose Comorbid post-traumatic stress disorder (PTSD) and depression are often associated with n... more Purpose Comorbid post-traumatic stress disorder (PTSD) and depression are often associated with negative physical and mental health outcomes in Operation Enduring Freedom/Operation Iraqi Freedom (OEF/OIF) combat veterans. The current study examines the individual contributions of these two disorders on health-related quality of life (HRQoL) in an OEF/OIF cohort. The study hypothesizes that PTSD and depression will each significantly predict lower physical and mental HRQoL even when controlling for overlapping symptoms: anhedonia, concentration, and insomnia. Method Participants were 220 OEF/OIF combat veterans who completed an interview and self-report questionnaires examining study variables. All study hypotheses were tested with multiple regression analyses. Results PTSD and depression significantly contributed to mental and physical HRQoL, even after controlling for overlapping symptoms. However, while independent main effects of PTSD and depression, with and without overlapping symptoms, emerged for predicting mental HRQoL, no significant independent main effects emerged for predicting physical HRQoL. Conclusion Findings suggest PTSD and depression contribute uniquely to the negative relationship with HRQoL, adding to the growing literature on distinctive and common effects of these disorders in OEF/OIF veterans. Results highlight the need to better understand the implications for assessment and treatment.
We aimed to describe differences in combat experience for male and female veterans and characteri... more We aimed to describe differences in combat experience for male and female veterans and characterize differential effects on postdeployment physical and mental health symptoms, including aggression. Retrospective cross-sectional health screening data from 554 Operation Enduring Freedom and Operation Iraqi Freedom veterans who enrolled for Veterans Affairs health care in San Diego were examined including measures of combat experience, pain intensity, traumatic brain injury symptoms, military sexual trauma, post-traumatic stress disorder, depression, alcohol use, and aggression. Although male veterans (n = 458) experienced significantly higher rates of combat than female veterans (n = 96), both experienced similar levels of postdeployment post-traumatic stress disorder and depression symptoms as well self-reported aggressive behavior compared to male veterans. Female veterans had higher rates of military sexual trauma and lower alcohol consumption than male veterans. All Operation Enduring Freedom and Operation Iraqi Freedom veterans returning from deployment may benefit from broad-based screening of physical and mental health symptoms, beyond those currently mandated by Veterans Affairs, including anger and aggression.
for the Marine Resiliency Study Team IMPORTANCE Posttraumatic stress disorder (PTSD) has been ass... more for the Marine Resiliency Study Team IMPORTANCE Posttraumatic stress disorder (PTSD) has been associated in cross-sectional studies with peripheral inflammation. It is not known whether this observed association is the result of PTSD predisposing to inflammation (as sometimes postulated) or to inflammation predisposing to PTSD. OBJECTIVE To determine whether plasma concentration of the inflammatory marker C-reactive protein (CRP) helps predict PTSD symptoms.
Traumatic brain injury (TBI) is a leading cause of sustained impairment in military and civilian ... more Traumatic brain injury (TBI) is a leading cause of sustained impairment in military and civilian populations. However, mild TBI (mTBI) can be difficult to detect using conventional MRI or CT. Injured brain tissues in mTBI patients generate abnormal slow-waves (1-4 Hz) that can be measured and localized by resting-state magnetoencephalography (MEG). In this study, we develop a voxel-based whole-brain MEG slow-wave imaging approach for detecting abnormality in patients with mTBI on a single-subject basis. A normative database of resting-state MEG source magnitude images (1-4 Hz) from 79 healthy control subjects was established for all brain voxels. The high-resolution MEG source magnitude images were obtained by our recent Fast-VESTAL method. In 84 mTBI patients with persistent post-concussive symptoms (36 from blasts, and 48 from non-blast causes), our method detected abnormalities at the positive detection rates of 84.5%, 86.1%, and 83.3% for the combined (blast-induced plus with non-blast causes), blast, and non-blast mTBI groups, respectively. We found that prefrontal, posterior parietal, inferior temporal, hippocampus, and cerebella areas were particularly vulnerable to head trauma. The result also showed that MEG slow-wave generation in prefrontal areas positively correlated with personality change, trouble concentrating, affective lability, and depression symptoms. Discussion is provided regarding the neuronal mechanisms of MEG slow-wave generation due to deafferentation caused by axonal injury and/or blockages/limitations of cholinergic transmission in TBI. This study provides an effective way for using MEG slow-wave source imaging to localize affected areas and supports MEG as a tool for assisting the diagnosis of mTBI.
for the Marine Resiliency Study Team IMPORTANCE Whether traumatic brain injury (TBI) is a risk fa... more for the Marine Resiliency Study Team IMPORTANCE Whether traumatic brain injury (TBI) is a risk factor for posttraumatic stress disorder (PTSD) has been difficult to determine because of the prevalence of comorbid conditions, overlapping symptoms, and cross-sectional samples.
Background: Post-traumatic stress disorder (PTSD) and pain are highly comorbid. Objective: The pu... more Background: Post-traumatic stress disorder (PTSD) and pain are highly comorbid. Objective: The purpose of this study was to examine the association of PTSD with specific pain complaints in veterans of Operations Enduring and Iraqi Freedom (OEF/OIF). Method: A total of 381 primarily male (88.5%) veterans with a mean age of 30 years completed a battery of self-report questionnaires. A positive PTSD screen was defined as a score of Ն40 on the Davidson Trauma Scale. Logistic regression was used to examine the association of positive PTSD screen with specific pain complaints. Results: There were no significant demographic or physical and mental health differences between veterans who screened positive for PTSD only and those with PTSD and at least one pain complaint, although differences on rates of combat injury and depression approached significance. Veterans who screened positive for PTSD were 2 to 3 times more likely to report abdominal pain, muscle aches or cramps, and joint aches, even after controlling for age, gender, combat injury, and depression. Conclusions: Similar to findings in other populations, there is a relationship between PTSD and pain complaints in OEF/OIF veterans. Future research should examine the mechanisms that link PTSD with specific pain complaints, especially abdominal pain.
Background: Research on the etiology of post-traumatic stress disorder (PTSD) has rapidly matured... more Background: Research on the etiology of post-traumatic stress disorder (PTSD) has rapidly matured, moving from candidate gene studies to interrogation of the entire human genome in genome-wide association studies (GWAS). Here we present the results of a GWAS performed on samples from combat-exposed U.S. Marines and Sailors from the Marine Resiliency Study (MRS) scheduled for deployment to Iraq and/or Afghanistan. The MRS is a large, C.M. Nievergelt et al.
Post-traumatic stress disorder (PTSD) is a leading cause of sustained impairment, distress, and p... more Post-traumatic stress disorder (PTSD) is a leading cause of sustained impairment, distress, and poor quality of life in military personnel, veterans, and civilians. Indirect functional neuroimaging studies using PET or fMRI with fear-related stimuli support a PTSD neurocircuitry model that includes amygdala, hippocampus, and ventromedial prefrontal cortex (vmPFC). However, it is not clear if this model can fully account for PTSD abnormalities detected directly by electromagnetic-based source imaging techniques in resting-state. The present study examined resting-state magnetoencephalography (MEG) signals in 25 active-duty service members and veterans with PTSD and 30 healthy volunteers. In contrast to the healthy volunteers, individuals with PTSD showed: 1) hyperactivity from amygdala, hippocampus, posterolateral orbitofrontal cortex (OFC), dorsomedial prefrontal cortex (dmPFC), and insular cortex in high-frequency (i.e., beta, gamma, and high-gamma) bands; 2) hypoactivity from vmPFC, Frontal Pole (FP), and dorsolateral prefrontal cortex (dlPFC) in high-frequency bands; 3) extensive hypoactivity from dlPFC, FP, anterior temporal lobes, precuneous cortex, and sensorimotor cortex in alpha and low-frequency bands; and 4) in individuals with PTSD, MEG activity in the left amygdala and posterolateral OFC correlated positively with PTSD symptom scores, whereas MEG activity in vmPFC and precuneous correlated negatively with symptom score. The present study showed that MEG source imaging technique revealed new abnormalities in the resting-state electromagnetic signals from the PTSD neurocircuitry. Particularly, posterolateral OFC and precuneous may play important roles in the PTSD neurocircuitry model.
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