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Exploration of intrinsic brain activity in migraine with and without comorbid depression

Abstract

Background

Major depressive disorder is a common comorbidity in migraineurs. Depression may affect the progression and prognosis of migraine. Few studies have examined the brain function in migraineurs that may cause this comorbidity. Here, we aimed to explore depression-related abnormalities in the intrinsic brain activity of interictal migraineurs with comorbid depression using resting-state functional magnetic resonance imaging.

Results

Significant main effects of migraine and depression provided evidence that migraine and depression jointly affected the left medial prefrontal cortex, which was thought to be the neural basis of self-referential mental activity in previous studies. Abnormalities in this region may contribute to determining the common symptoms of migraine and depression and even result in comorbidity. Additionally, migraineurs with comorbid depression had different developmental trajectories in the right thalamus and fusiform, which were associated with recognizing, transmitting, controlling and remembering pain and emotion.

Conclusions

Based on our findings, the abnormal mPFC which may contribute to determining the common symptoms in migraine and depression and may be a therapeutic target for migraineurs comorbid depression. The different developmental trajectory in thalamus and fusiform indicates that the comorbidity may arise through a specific mechanism rather than simple superposition of migraine and depression.

Background

Migraine is often accompanied by emotional dysfunction. The depression comorbidity has high prevalence which is the most common comorbidity in migraineurs. The incidence of depression in migraineurs ranges from 8.6% to 47.9%, according to a meta-analysis of 12 studies [1]. Depression in migraineurs is a significant risk factor for migraine chronification, refractoriness to migraine treatments, overuse of medication, increased migraine-related disability, affective temperament dysregulation and suicidal behaviors which contribute to the psychosocial impairment and altered quality of life [2,3,4,5,6]. However, the depression comorbidity is often overlooked in migraineurs. Therefore, it is imperative to attach importance to this comorbidity to prevent, identify and treat depression in patients with migraine.

The combination of migraine and depression has been associated with smaller brain tissue volume than that in patients with one or neither of these conditions [7]. The brains of migraineurs with comorbid depression differed from patients with migraine only or depression only. Many migraine neuroimaging studies explored alterations of the brain, identified abnormal functions of specific brain regions and speculated that these regions may contribute to determining the depressive symptoms of migraine in migraine without aura [8,9,10,11]. However, previous researches have bot clearly determined whether these brain regions differ in migraineurs with depression compared with patients diagnosed with migraine only or depression only. We postulate that migraine and depression exert different effects in brain state, particularly the functions of specific brain regions that might be associated with clinical symptom and the shared etiological risk factors of the migraine-depression comorbidity.

The amplitude of low-frequency fluctuation (ALFF) is a way of measuring regional intrinsic brain activity to explore the pathophysiology underlying neurological and psychiatric diseases [12, 13]. We aimed to explore depression-related abnormalities in the intrinsic brain activity of interictal migraineurs with comorbid depression using resting-state functional magnetic resonance imaging (RS-fMRI) and compare the findings among four groups, including migraineurs with depression (dMIG), migraineurs without depression (ndMIG), patients with major depressive disorder (MDD) and healthy controls (HC).

Results

Demographic and neuropsychological characteristics

Subject demographics and clinical characteristics are shown in Table 1. With the exception of the HRSD scores, no significant differences were observed among the four groups (F = 18.494, P < 0.001). A post hoc test was applied to the mean 24-HRSD scores of the four groups; higher scores were recorded for in the groups of dMIG and MDD than in the groups of ndMIG or HC (P < 0.001).

Table 1 Demographic and clinical characteristics of all subjects

Significant main effects

The two-way ANOVA on ALFF reveled three significant brain regions with a main effect of migraine: the bilateral posterior cingulate cortex/precuneus (PCC/precuneus) (F = 13.10; P < 0.001) (Fig. 1a), the right gyrus rectus (REC) (F = 11.83; P < 0.001) and left medial prefrontal cortex (mPFC) (F = 16.0; P < 0.001) (Fig. 1b). The only region which was observed with a significant main effect of depression was the left mPFC (F = 71.57, P < 0.001) (Fig. 1c). The details of these brain regions were shown in the Table 2. Post hoc analysis showed significantly decreased ALFF values in the right REC and increased values in the bilateral PCC/precuneus and left mPFC in dMIG and ndMIG compared with the MDD and HC groups, as well assignificantly increased ALFF values in the left mPFC in dMIG and MDD groups compared with those in ndMIG and HC groups. No significant differences were observed in any other comparison.

Fig. 1
figure1

Significant main effect of migraine. Significant main effect of migraine in left medial prefrontal cortex (a), the bilateral posterior cingulate cortex/ precuneus (b) and the right rectus gyrus (c) and main effect of depression in left medial prefrontal cortex (d); mPFC: medial prefrontal cortex; REC: rectus gyrus; PCC: posterior cingulate cortex. dMIG: migraineurs with depression; ndMIG: migraineurs without depression; MDD: patients with major depressive disorderand; HC: healthy controls; mPFC: medial prefrontal cortex; PCC: posterior cingulate cortex; REC: rectus gyrus

Table 2 Brain regions showing significant main and interaction effects among four groups

Interaction effects

Significant interaction effects were observed in the right thalamus (F = 10.89; P < 0.001) (Fig. 2a) and right fusiform (F = 16.56; P < 0.001) (Fig. 2b). The details of these brain regions were shown in the Table 2. According to the post hoc analysis, the ALFF values in the right thalamus were decreased in the dMIG group comparing with those in ndMIG group (P = 0.006, Bonferroni corrected) and MDD group (P = 0.01, Bonferroni corrected). Furthermore, in the fusiform, the dMIG group displayed increased ALFF values compared with those in the ndMIG group (P = 0.005, Bonferroni corrected), and the ALFF values of the ndMIG group were decreased compared with those in HC group (P = 0.004, Bonferroni corrected), but no difference in any other comparison were observed between the groups.

Fig. 2
figure2

Significant interaction effects. Significant interaction effects in right thalamus (a) and the right fusiform (b); * uncorrected, P < 0.05. ** indicated Bonfornni corrected. dMIG migraineurs with depression, ndMIG migraineurs without depression, MDD patients with major depressive disorder and, HC healthy controls

Clinical correlations

As these analyses were exploratory, we used a statistical significance level of P < 0.01. Significant correlations were observed between the ALFF values for other ROIs and clinical characteristics.

Discussion

In the current study, we examined the effect of depression on intrinsic brain activity, as reflected by ALFF in migraineurs and HCs among the four groups. Compared with persons without migraine, migraineurs exhibited significantly decreased activity in the right REC and increased intrinsic brain activity in the bilateral PCC/precuneus. Additionally, migraine and depression affected the left mPFC with increasing ALFF simultaneously and exerted different effects in right thalamus and fusiform. Taken together, these findings may yield insights into the comorbidity and provide a basis for developing novel imaging biomarkers for gauging the impact of therapeutics.

Although many studies have shown a clear relationship between migraine and depression, most of them were based on clinical observations, case studies, and genetic epidemiology. Based on these studies, it was speculated that many factors, including serotonergic disorders, hypothalamic-pituitary-adrenal axis hyperactivity, inflammation, and environmental or genetic risk factors for inflammation may converge to result in an altered brain state that could predispose individuals to both migraine and depression [1, 9, 14, 15]. However, the specific changes in brain regions function have not yet been reported in the literature. Therefore, we examined the effect of depression on intrinsic brain activity, reflected by ALFF in migraine and HC among four groups.

Consistent with the findings of previous studies, the current study observed that the depressive patients had increased intrinsic brain activity in the left mPFC. As the anterior node of the default mode network (DMN), the mPFC was highly active at rest but had suppressed activity during cognitive and emotional processing [16, 17]. Converging evidence suggested altered mPFC functional connectivity involved in the development of MDD and the mPFC had long been suspected to be the neural basis of self-referential mental activity [18, 19]. In this study, migraineurs also exhibited increased intrinsic brain activity in the left mPFC. Neuroimaging studies have identified frontal cortical abnormalities in migraineurs [20, 21]. Neuropsychological investigations have highlighted PFC related cognitive impairments in migraineurs, including working memory and executive function deficits [22, 23]. Based on these findings, we speculate that abnormalities in the mPFC region contribute to determining the common symptoms of migraine and depression, even results in the comorbidity and may be a therapeutic target for migraineurs comorbid depression.

In this study, compared with persons without migraine, migraineurs exhibited significantly decreased activity in the right REC and increased intrinsic brain activity in the bilateral PCC/precuneus which has been reported to be dysfunctional in previous studies, particularlythe PCC/precuneus. The REC exhibits a reduced volume in patients with schizophrenia and depression, but relatively fewer studies have reported similar findings in migraine. The REC is part of a circuit that mediates some specific cognitive and emotional functions in humans and plays an important role in the pathogenesis of behavioral addiction combined with substance abuse [24, 25]. Thus, we speculated that the abnormalities in the right REC in migraine may suggest that migraineurs are prone to emotional disorders and drug addiction. The bilateral PCC/ precuneus are the key nodes of DMN and have been observed dysfunction in previous study. There were few reports about activation alteration in migraine. The regions had a high baseline metabolic rate measured by PET. They reduced metabolism and functional connectivity in healthy aging and neurodegenerative diseases like Alzheimier’s disease [26, 27]. However, it was reported that the region increased metabolism and altered functional connectivity in MDD [28, 29]. So we speculated that the altered activity of PCC/ precuneus in migraine might be associated with the depressive tendency. It need more neuroimaging study to verify.Migraineurs with comorbid depression showed decreased intrinsic brain activity in the thalamus compared with ndMIG and MDD and increased activity in the fusiform compared with ndMIG. As a critical multifunctional relay center, the thalamus is considered the transmission control center of emotion and is thought to play an important role in the transmission of nociceptive inputs to cortical structures that are speculated to be involved in the migraine-depression comorbidity, as depression may affect the homeostasis of the transmission of headache-related nociceptive signals from the thalamus to the cortex [30, 31]. Thalamic neurons must adjust to constantly changing physiological (sleep, wakefulness, food intake, body temperature, heart rate, and blood pressure), behavioral (addiction and isolation), cognitive (attention, learning, and memory use), and affective (stress, anxiety, depression, and anger) parameters to maintain homeostasis [32]. The current finding of decreased activity in the thalamus may support the hypothesis that the habituation deficit in migraineurs with depression is due to a reduced preactivation level of sensory cortices and not to increased excitability or reduced intracortical inhibition. Moreover, the ALFF of the right fusiform negatively correlated with the mean headache degree of migraine in ndMIG. Vey fewstudies of fusiform activity have been conducted, and they have found divergent results concerning migraine [33, 34]. The divergence in finding from migraine may be due to differences in the course of migraine or a lack of consideration of the emotional effect. The function of the fusiform has been linked to various neural pathways related to recognition, cognitive pain processing and various neurological phenomena such as synesthesia, dyslexia, and prosopagnosia [35]. Atypical functions and structure of the fusiform gyrus have been identified in chronic low back pain, fibromyalgia, and cluster headache patients [35, 36]. Depression combined with migraine may recruit additional neural resources to improve task performance and enhance the mental imagery of pain based on memories of recurrent migraine headaches, raising the possibility of migraine chronification [37].

Migraineurs with comorbid depression showed significantly decreased intrinsic brain activity in the thalamus and increased activity in the fusiform compared with ndMIG. According to genetic studies, migraine may be a symptom or consequence of MDD in at least a subset of migraine patients with depression as the comorbid depression and migraine were genetically most similar to depression patient [38]. Although our results revealed that migraineurs with comorbid depression exhibit significant changes in brain activity in the thalamus and fusiform gyrus (indicated Bonfornni corrected) with those migraineurs and patients with depression. We speculate that these changes determine the different symptoms. This finding highlights the abnormal developmental patterns of intrinsic brain activity in migraine-depression comorbidity as opposed to migraine or depression alone.

Recently, the functional organization of white matter (WM) in resting-state has received greater attention. Several studies demonstrated the existence of functional brain activity in the WM in normal controls and insufficient or ineffective communication associated with WM abnormalities in many brain disorders, including schizophrenia, epilepsy, Alzheimer’s and Parkinson’s disease [39,40,41,42,43]. In particular, diffusion tensor imaging (DTI) can offer a unique noninvasive insight into the microstructure of WM tracts in the living brain. The DTI studies have revealed abnormal WM integrity in patients with migraine and depression. Solid evidence has been shown that patients with migraine and depression show abnormal diffusion characteristics in several WM tracts such as frontal WM cluster, corpus callosum, optic radiation and internal capsule [44,45,46,47]. In current study, it can be found that the partials of the regions of main effect were located in the white matter (WM), especially the with matter in mPFC which has been detected increased radial diffusivity in migraine and depression [45, 48]. Converging the considerable evidence and current results, the mPFC may be the key region of migraineurs cormobid depression.

Based on the results from this study, migraine and depression selectively affect the function of the posterior and anterior nodes of the DMN [4951]. The DMN is highly related to cognitive processes and influences behavior in response to the environment in a predictive manner [52]. The network reduces its activation during task-related activities or those that require executive function in the healthy human brain. Previous studies have demonstrated that the DMN is dysfunctional in a resting state in various neurological and neuropsychiatric disorders, such as migraine, epilepsy and depression [50, 53, 54]. Studies of functional connectivity and the DMN are necessary to further examine the comorbidity of migraine and depression. Moreover, the relationship between the intrinsic brain activity and cortical thickness has been shown that the spatial distribution of cortical thickness was negatively correlated with surface-based intrinsic brain activity at whole-brain level in epilepsy [55]. This finding contributes to the analysis clinical application of the current results and combine with previous studies of cortical thickness in migraine or depression. But there is no study reporting the cortical thickness in migraine comorbid with depression. Thus, it may be a good direction to research the cortical thickness and elucidate its associate with intrinsic brain activity to aware the brain function of migraineur comorbid with depression.

Similar to most clinical studies, the present study has several limitations. First,, we only included the patients who had never taken any antidepressants or durgs to prevent migraine before the RS-fMRI scan in order to avoid the effects of drugs for migraine and depression on brain activation and the possible withdrawal effect. Therefore, only 10 of 120 migraineurs with depression completed the fMRI scan. The small number of patients could leave our study too underpowered to reveal more subtle findings, such as correlations between clinical features, although our research used rigorous statistical methods with appropriate corrections. Second, as this study employed a cross-sectional design, we were unable to easily estimate whether this abnormal intrinsic brain activity exhibited dynamic changes with follow-up. In the future, it is necessary to conduct prospective longitudinal studies with large sample sizes to assess the associations between migraine with depression and changes in brain activation. An fMRI assessment of changes in functional connectivity might help clarify the association between migraine headache and MDDand elucidate the direction of comorbidity development.

Conclusions

This study explored intrinsic brain activity in migraine with comorbid depression in four groups. As expected, migraine and depression jointly affected left mPFC, which is thought to be the neural basis of self-referential mental activity and has been shown the increased ALFF in depression patients. We speculated the abnormal mPFC may contribute to determining the common symptoms in migraine and depression and may be a therapeutic target for migraineurs comorbid depression. Besides, it was found that migraine and depression had apparently different developmental trajectory in the right thalamus and right fusiform, which are associated with recognizing, transmitting, controlling and remembering pain and emotion. The abnormalities in these regions may be relevant to the special phenotype of the migraine and depression comorbidity, and our results suggest that the comorbidity arises through a specific mechanism rather than a mere superposition of migraine and depression. In the future, migraine studies may need to consider depression when interpreting fMRI data.

Methods

Study population

All the patients were recruited from the Department of Neurology or Psychiatry of West China Hospital between June 2016 and February 2017 and were evaluated by at least two neurologists and two psychiatrists. The diagnosis of migraine without aura was made according to the International Classification of Headache Disorders, 3rd edition (beta version) (ICHD-3 beta). The diagnosis of migraine without aura in ICHD-3 beta is not different from the diagnosis based on ICHD-3 [56]. Depression was diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) criteria. The inclusion criteria of all subjects were (1) Han ethnicity (the predominant ethnic group in China), (2) 18–60 years of age, (3) right-handed, and (4) first came to the clinic seeking medical help for migraine and depression. The exclusion criteria were (1) a history of systemic disease, chronic pain disorders and serious neurological disorders; (2) a history of analgesic overuse, as we aimed to avoid recruiting patients with common secondary headache-medication overused headache; (3) the presence of intracranial lesions detected in previous MRI or CT scans; (4) had the contraindications for MRI scanning, including metal implant or psychiatric disorders, such as anxiety (claustrophobia), that prevented patients from completing the MRI scanning; (5) a headache attack during RS-fMRI or within 24 h after scanning.

The dMIG group

The subjects were diagnosed with migraine without aura and comorbid depression according to the criteria of ICHD-3 beta and the DSM-5. They were all initially diagnosed with migraine and depression and had not used any antidepressants or drugs to preventing migraine. All the patients in this group had scores of greater than 24 on 24-item Hamilton Rating Scale for Depression (24-HRSD). The patients had no history of other types of headache, anxiety or other psychiatric disorders.

The ndMIG group

The patients in this group were recruited from the Department of Neurology and diagnosed with migraine without aura and had no history of any psychiatric disorders including MDD or depressive mood. The patients were all initially diagnosed with migraine and had not previously used any drugs to prevent migraine. All the patients in this group had scores of less than 8 on the 24-HRSD.

The MDD group

The patients in the MDD group were diagnosed according to the DSM-5 by at least two psychiatrists. They had no history of migraine, other types of headache, anxiety or other psychiatric disorders. The patients were all first diagnosed with depression and had never used any antidepressant.

The HC group

HC were recruited in June 2016 and February 2017. They were evaluated by two neurologists and two psychiatrists and had no history of migraine, depression, alcohol dependence or of using medications. Besides, they had no family history of migraine and psychiatric disorders.

The subjects in the four groups were matched for sex, mean age, and years of education. After evaluating the potential subjects, we established 4 groups, including 10 dMIG, 22 ndMIG (migraineurs with no depressive mood), 13 MDD and 27 HC. The demographic data of all the subjects and clinical characteristics of migraineurs were obtained, including age, gender, years of education, migraine duration, attack frequency and attack duration of migraine, headache degree, the Headache Impact Test-6 (HIT-6) and scores on the 24-HRSD, 14-Hamilton Anxiety Rating Scale (14-HAMA) and Montreal Cognitive Assessment (MoCA).

MRI data acquisition

All the scans were performed on a 3.0-T MRI scanning system (Siemens Trio Tim, Erlangen, Germany) at the Department of Radiology, West China Hospital of Sichuan University. Earplugs and tight padded clamps were used to minimize noise exposure and head motion. The participants were instructed to remain still, close their eyes, remain awake and let their minds wander. Scanning was terminated if the participant complained of any discomfort. Images of structures were obtained using routine T1 weighted imaging, and the RS-fMRI was conducted using an echo-planar imaging (EPI) sequence (TR 2000 ms, TE 30 ms, voxel size 3.75 × 3.75 × 5 mm3, flip angle 90°, slice thickness 5 mm, matrix 64 × 64, FOV 24 × 24 cm2). Each resting-state scan lasted for 6 min and 180 volumes were collected. Two experienced neuroradiologists performed all scan and checked the images to exclude brain tissue abnormalities in the four groups.

RS-fMRI image preprocessing

Functional images were preprocessed with the software Data Processing Assistant for Resting-State fMRI, Advanced Edition (DPARSF A, http://rfmri.org/DPARSF) in MATLAB (R2010b). The first 10 volumes were removed for each subject. The remaining images were corrected by slicing time and realigned. No subjects displayed head movement i.e., head motions exceeding 2.0 mm of translation or 2.0 degrees of rotation during the scanning process to disqualify them from the study. The subsequent processing steps included normalizing the scans into the standard stereotactic space using the Montreal Neurological Institute EPI template; smoothing with an 8 × 8 × 8 mm3 full width at half-maximum kernel; and removing covariates by linear regression, including head motion parameters, averaged signal from the white matter and signal from the cerebrospinal fluid, to further reduce the effects of confounding factors. Finally, the functional images were detrended by bandpass filtering (0.01–0.08 Hz) to reduce low-frequency drift and physiological high-frequency respiratory and cardiac noise.

ALFF analysis

We computed the ALFF value for each voxel using DPARSF software (Advanced Edition, http://rfmri.org/DPARSF) to construct the intrinsic brain activity map of each subject, The power spectrum was obtained after the time series of each voxel was transformed to the frequency domain. The average square root of the power spectrum was regarded as the ALFF. For the purpose of reducing the global effects of variability across subjects, the ALFF value of each voxel was normalized to the global mean ALFF value [49].

Statistical analysis

The values are reported as absolute numbers with percentages for categorical variables and as means with SDs for continuous variables. χ2 tests, t-tests and analysis of variance (ANOVA) were performedto compare categorical variables between groups, continuous variables between two groups, and continuous variables among four groups, respectively. The level of statistical significance was defined as combined P < 0.01.

Two-way ANOVA with migraine and depression as between-subject factors was performed on the individual normalized ALFF maps using statistical parametric mapping (SPM 8, www.fil.ion.ucl.ac.uk/spm). Comparisons of the main effects and interaction effect were corrected using AlphaSim correction. The level of statistical significance was defined as combined P < 0.05 (combined height threshold P < 0.001 and a minimum cluster size of 10 voxels with AlphaSim correction).The brain regions with significant main effects and interaction effects were designated as regions of interest (ROIs). Post hoc tests were then performed on the ROIs using Bonferroni correction (P < 0.05/4 = 0.0125). We computed Pearson correlation coefficients of average ROI ALFF values versus clinical factors of migraine (duration, mean attack frequency, duration of daily attack, mean visual analogue scale score (VAS score) and HIT-6) and neuropsychological variables (MoCA, 14-HRSD and 14-HAMA) separately for dMIG, ndMIG and MDD groups to explore the relationship between intrinsic brain activity and the clinical characteristics.

Abbreviations

14-HAMA:

14-item Hamilton Anxiety Rating Scale

24-HRSD:

24-item Hamilton Rating Scale for Depression

ALFF:

the amplitude of low-frequency fluctuation

ANOVA:

Analysis of variance

dMIG:

Migraineurs with depression

DMN:

Default mode network

DPARSF A:

Data Processing Assistant for Resting-State fMRI, Advanced Edition

DSM-5:

The Diagnostic and Statistical Manual of Mental Disorders, 5th edition

EPI:

Echo-planar imaging

HC:

Healthy controls

HIT-6:

Headache Impact Test-6

ICHD− 3:

The International Classification of Headache Disorders, 3-rd

MDD:

Major depressive disorder

mFPC:

Medial prefrontal cortex

MoCA:

Montreal Cognitive Assessment

ndMIG:

Migraineurs without depression

PCC:

Posterior cingulate cortex

REC:

Right gyrus rectus

ROIs:

Regions of interest

RS-fMRI:

Resting-state functional magnetic resonance imaging

SPM 8:

Statistical parametric mapping 8

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Acknowledgments

We would like to thank Wei Wei and Jing Zhang for diagnosiing depression in the enrolling patients and Gui Fu for providing technical assistance during MRI scanning.

Funding

This work was supported by grants from the National Natural Science Foundation of China.

(Grant Nos. 81071140, 81500959, 81000605 and 81110108007).

Availability of data and materials

All the relevant data are included within the paper.

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Authors

Contributions

MMM and JRZ were responsible for analyzing the data, revising and drafting the manuscript and they contributed equally to this work. NC, JG and YZ were responsible for data acquisition and interpretation. LH conceived and designed the study. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Li He.

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The study protocol was approved by the Local Ethics Committee of West China Hospital, Sichuan University. Written informed consent was obtained from all the subjects.

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Consent to publish had been obtained from all the subjects.

Competing interests

The authors declare that they have no competing interests.

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Cite this article

Ma, M., Zhang, J., Chen, N. et al. Exploration of intrinsic brain activity in migraine with and without comorbid depression. J Headache Pain 19, 48 (2018). https://doi.org/10.1186/s10194-018-0876-9

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Keywords

  • Migraine
  • Psychiatric comorbidity
  • Depression
  • Neuroimaging
  • Amplitude of low frequency fluctuation patterns
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