Relation Between Frontal Alpha Asymmetry and Anxiety in Young Patients with Generalized Anxiety Disorder

Abstract Frontal alpha asymmetry (the relative difference in power between two signals in different hemispheres) has been suggested as biomarker for anxiety. The goal of this study was to evaluate alpha asymmetry in the frontal region for young people (7-18 years) with generalized anxiety disorder, diagnosed according to two statistic manuals (DMS-IV-R and ICD-10), the medical history and the neuropsychological assessment. The QEEG recording and analysis of the obtained results from alpha spectra power and log of alpha spectra power are made in four conditions (eyes open, eyes closed, VCPT and ACPT). The obtained results for alpha power in general showed higher cortical activity in the right hemisphere, associated with negative emotions. The calculated alpha asymmetry separate for eyes open, eyes closed, VCPT and ACPT conditions showed the right activation in all four conditions. In addition, the right frontal asymmetry was specific for the Fp1-Fp2 region, while a greater left frontal activation was recorded for the F7-F8 region. The log of alpha power in general was additionally analyzed. The calculated asymmetry score in general (in a way that the left log transformed score was subtracted from the right) confirmed a greater right activation. Testing the power of the whole alpha band (μV2) in general, for all four conditions and for frontal region confirmed the right alpha asymmetries in all participants. The right alpha asymmetry in the frontal region was specific only for the Fp1-Fp2 region (frontopolar region). The only greater left frontal activation was registered between the F7-F8 region. Our findings are supported by many other studies using specific localization methods like fMRI or LORETA source localization.

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Microcurrent Stimulation at Shenmen Acupoint Facilitates EEG Associated with Sleepiness and Positive Mood: A Randomized Controlled Electrophysiological Study

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2015/182837 ◽

2015 ◽

Vol 2015 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Mei-chun Cheung ◽

Agnes S. Chan ◽

Joanne Yip

Keyword(s):

Placebo Group ◽

Brain Activity ◽

Frontal Region ◽

Electrocutaneous Stimulation ◽

Alpha Power ◽

Sham Stimulation ◽

Alpha Asymmetry ◽

Frontal Alpha Asymmetry ◽

The Brain ◽

Experimental Group

To examine the electrophysiological effects of microcurrent stimulation at the Shenmen acupoint, 40 healthy normal subjects were randomly assigned to a placebo group (sham stimulation) and an experimental group (bilateral electrocutaneous stimulation at the Shenmen). The following two electroencephalographic indicators were used to measure brain activity. (1) Arousal level was measured with reference to log-transformed absolute alpha power and power source and analyzed using low-resolution electromagnetic tomography and (2) frontal alpha asymmetry was used as an indicator of mood. After real stimulation for 10 minutes, absolute alpha power was globally reduced in the experimental group, particularly in the anterior and centrotemporal regions of the brain. This indicates a decline in the brain activity associated with arousal. Moreover, the reduction was more prominent in the left frontal region, as compared to the right frontal region, resulting in significant increase from negative to positive frontal alpha asymmetry scores and reflecting an increase in the brain activity associated with enhanced mood. However, the placebo group exhibited no significant changes in two indicators after sham stimulation. This study provides initial electrophysiological evidence of changes in brain activity associated with reduced arousal (and thus greater sleepiness) and enhanced mood after microcurrent stimulation at the Shenmen acupoint.

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White-matter abnormalities in the right posterior hemisphere in generalized anxiety disorder: a diffusion imaging study

Psychological Medicine ◽

10.1017/s0033291711001255 ◽

2011 ◽

Vol 42 (2) ◽

pp. 427-434 ◽

Cited By ~ 14

Author(s):

P. Brambilla ◽

G. Como ◽

M. Isola ◽

F. Taboga ◽

R. Zuliani ◽

...

Keyword(s):

Anxiety Disorder ◽

White Matter ◽

Generalized Anxiety Disorder ◽

Parietal Cortex ◽

Right Hemisphere ◽

Diffusion Imaging ◽

Generalized Anxiety ◽

Healthy Controls ◽

Apparent Diffusion Coefficients ◽

The Right

BackgroundPrior imaging studies have shown structural, functional and biochemical impairments in patients with generalized anxiety disorder (GAD), particularly in the right hemisphere. In this study we investigated, for the first time to the best of our knowledge, the white-matter microstructure organization in GAD.MethodA total of 12 patients with DSM-IV GAD and 15 matched healthy controls underwent a magnetic resonance imaging session of diffusion weighted imaging, exploring white-matter water molecules by the means of apparent diffusion coefficients (ADCs). Regions of interests were placed in the frontal, parietal, temporal and occipital lobes and in the splenium and genu of the corpus callosum, bilaterally.ResultsADC measures were significantly greater in patients with GAD in the right splenium and right parietal cortex compared with healthy controls (p⩽0.002). No significant correlations between ADCs and age or clinical variables were found.ConclusionsWe provide evidence that GAD is associated with disrupted white-matter coherence of posterior right hemisphere regions, which may partly sustain the impaired cognitive regulation of anxiety. Future diffusion imaging investigations are expected to better elucidate the communication between the parietal cortex and other right hemisphere regions in sustaining the cognitive processing of social and emotional stimuli in patients with GAD.

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Cortical and subcortical brain structure in generalized anxiety disorder: findings from 28 research sites in the ENIGMA-Anxiety Working Group

Translational Psychiatry ◽

10.1038/s41398-021-01622-1 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Anita Harrewijn ◽

Elise M. Cardinale ◽

Nynke A. Groenewold ◽

Janna Marie Bas-Hoogendam ◽

Moji Aghajani ◽

...

Keyword(s):

Anxiety Disorder ◽

Generalized Anxiety Disorder ◽

Brain Structure ◽

Working Group ◽

Secondary Analysis ◽

Small Sample ◽

Generalized Anxiety ◽

Healthy Controls ◽

Imaging Data ◽

The Right

AbstractThe goal of this study was to compare brain structure between individuals with generalized anxiety disorder (GAD) and healthy controls. Previous studies have generated inconsistent findings, possibly due to small sample sizes, or clinical/analytic heterogeneity. To address these concerns, we combined data from 28 research sites worldwide through the ENIGMA-Anxiety Working Group, using a single, pre-registered mega-analysis. Structural magnetic resonance imaging data from children and adults (5–90 years) were processed using FreeSurfer. The main analysis included the regional and vertex-wise cortical thickness, cortical surface area, and subcortical volume as dependent variables, and GAD, age, age-squared, sex, and their interactions as independent variables. Nuisance variables included IQ, years of education, medication use, comorbidities, and global brain measures. The main analysis (1020 individuals with GAD and 2999 healthy controls) included random slopes per site and random intercepts per scanner. A secondary analysis (1112 individuals with GAD and 3282 healthy controls) included fixed slopes and random intercepts per scanner with the same variables. The main analysis showed no effect of GAD on brain structure, nor interactions involving GAD, age, or sex. The secondary analysis showed increased volume in the right ventral diencephalon in male individuals with GAD compared to male healthy controls, whereas female individuals with GAD did not differ from female healthy controls. This mega-analysis combining worldwide data showed that differences in brain structure related to GAD are small, possibly reflecting heterogeneity or those structural alterations are not a major component of its pathophysiology.

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Reduced cortical thickness and increased gyrification in generalized anxiety disorder: a 3 T MRI study

Psychological Medicine ◽

10.1017/s003329171700352x ◽

2017 ◽

Vol 48 (12) ◽

pp. 2001-2010 ◽

Cited By ~ 13

Author(s):

Cinzia Molent ◽

Eleonora Maggioni ◽

Filippo Cecchetto ◽

Marco Garzitto ◽

Sara Piccin ◽

...

Keyword(s):

Anxiety Disorder ◽

Generalized Anxiety Disorder ◽

Cortical Thickness ◽

Right Hemisphere ◽

Gray Matter Volume ◽

Structural Mri ◽

Generalized Anxiety ◽

Magnetic Resonance Imaging Mri ◽

The Right ◽

Mri Study

AbstractBackgroundAlthough the study of the neuroanatomical correlates of generalized anxiety disorder (GAD) is gaining increasing interest, up to now the cortical anatomy of GAD patients has been poorly investigated and still no data on cortical gyrification are available. The aim of the present study is to quantitatively examine the cortical morphology in patients with GAD compared with healthy controls (HC) using magnetic resonance imaging (MRI). To the best of our knowledge, this is the first study analyzing the gyrification patterns in GAD.MethodsA total of 31 GAD patients and 31 HC underwent 3 T structural MRI. For each subject, cortical surface area (CSA), cortical thickness (CT), gray matter volume (GMV), and local gyrification index (LGI) were estimated in 19 regions of interest using the Freesurfer software. These parameters were then compared between the two groups using General Linear Model designs.ResultsCompared with HC, GAD patients showed: (1) reduced CT in right caudal middle frontal gyrus (p < 0.05, Bonferroni corrected), (2) hyper-gyrification in right fusiform, inferior temporal, superior parietal and supramarginal gyri and in left supramarginal and superior frontal gyri (p < 0.05, Bonferroni corrected). No significant alterations in CSA and GMV were observed.ConclusionsOur findings support the hypothesis of a neuroanatomical basis for GAD, highlighting a possible key role of the right hemisphere. The alterations of CT and gyrification in GAD suggest a neurodevelopmental origin of the disorder. Further studies on GAD are needed to understand the evolution of the cerebral morphology with age and during the clinical course of the illness.

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The French Version of the Revised Child Anxiety and Depression Scale (RCADS) in a Nonclinical Sample

Swiss Journal of Psychology ◽

10.1024/1421-0185/a000158 ◽

2015 ◽

Vol 74 (3) ◽

pp. 119-127 ◽

Cited By ~ 10

Author(s):

Martine Bouvard ◽

Anne Denis ◽

Jean-Luc Roulin

Keyword(s):

Factor Analysis ◽

Anxiety Disorder ◽

Confirmatory Factor Analysis ◽

Generalized Anxiety Disorder ◽

Child Anxiety ◽

Depression Scale ◽

Anxiety And Depression ◽

Generalized Anxiety ◽

French Version ◽

Confirmatory Factor

This article investigates the psychometric properties of the Revised Child Anxiety and Depression Scale (RCADS). A group of 704 adolescents completed the questionnaires in their classrooms. This study examines potential confirmatory factor analysis factor models of the RCADS as well as the relationships between the RCADS and the Screen for Child Anxiety Related Emotional Disorders-Revised (SCARED-R). A subsample of 595 adolescents also completed an anxiety questionnaire (Fear Survey Schedule for Children-Revised, FSSC-R) and a depression questionnaire (Center for Epidemiological Studies Depression Scale, CES-D). Confirmatory factor analysis of the RCADS suggests that the 6-factor model reasonably fits the data. All subscales were positively intercorrelated, with rs varying between .48 (generalized anxiety disorder-major depression disorder) and .65 (generalized anxiety disorder-social phobia/obsessive-compulsive disorder). The RCADS total score and all the RCADS scales were found to have good internal consistency (> .70). The correlations between the RCADS subscales and their SCARED-R counterparts are generally substantial. Convergent validity was found with the FSSC-R and the CES-D. The study included normal adolescents aged 10 to 19. Therefore, the findings cannot be extended to children under 10, nor to a clinical population. Altogether, the French version of the RCADS showed reasonable psychometric properties.

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Psychometric Properties of the Spontaneous and Deliberate Mind Wandering Scales

European Journal of Psychological Assessment ◽

10.1027/1015-5759/a000470 ◽

2019 ◽

Vol 35 (6) ◽

pp. 878-890 ◽

Cited By ~ 4

Author(s):

David Marcusson-Clavertz ◽

Oscar N. E. Kjell

Keyword(s):

Anxiety Disorder ◽

Psychometric Properties ◽

Generalized Anxiety Disorder ◽

Social Desirability ◽

Cognitive Task ◽

Experience Sampling ◽

Well Being ◽

Mind Wandering ◽

Generalized Anxiety ◽

Psychological Variables

Abstract. Thinking about task-unrelated matters (mind wandering) is related to cognition and well-being. However, the relations between mind wandering and other psychological variables may depend on whether the former commence spontaneously or deliberately. The current two studies investigated the psychometric properties of the Spontaneous and Deliberate Mind Wandering Scales (SDMWS; Carriere, Seli, & Smilek, 2013 ). Study 1 evaluated the stability of the scales over 2 weeks ( N = 284 at Time 1), whereas Study 2 ( N = 323) evaluated their relations to Generalized anxiety disorder symptoms, Openness, Social desirability, and experience-sampling reports of intentional and unintentional mind wandering during an online cognitive task. The results indicated that the SDMWS were better fitted with a two-factor than a one-factor solution, although the fit was improved with the exclusion of one item. The scales exhibited strong measurement invariance across gender and time, and moderately high test-retest reliability. Spontaneous mind wandering predicted Generalized anxiety disorder and experience-sampling reports of unintentional mind wandering, whereas Deliberate mind wandering predicted Openness and experience-sampling reports of intentional mind wandering. Furthermore, Spontaneous mind wandering showed a negative association with social desirability of weak-to-medium strength. In sum, the scales generally showed favorable psychometric properties.

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