Abstract
The extent of functional abnormalities in frontal-subcortical circuits in obsessive-compulsive disorder (OCD) is still unclear. Although neuroimaging studies, in general, and resting-state functional Magnetic Resonance Imaging (rs-fMRI), in particular, have provided relevant information regarding such alterations, rs-fMRI studies have been typically limited to the analysis of between-region functional connectivity alterations at low-frequency signal fluctuations (i.e., <0.08 Hz). Conversely, the local attributes of Blood Oxygen Level Dependent (BOLD) signal across different frequency bands have been seldom studied, although they may provide valuable information. Here, we evaluated local alterations in low-frequency fluctuations across different oscillation bands in OCD. Sixty-five OCD patients and 50 healthy controls underwent an rs-fMRI assessment. Alterations in the fractional amplitude of low-frequency fluctuations (fALFF) were evaluated, voxel-wise, across four different bands (from 0.01 Hz to 0.25 Hz). OCD patients showed decreased fALFF values in medial orbitofrontal regions and increased fALFF values in the dorsal-medial prefrontal cortex (DMPFC) at frequency bands <0.08 Hz. This pattern was reversed at higher frequencies, where increased fALFF values also appeared in medial temporal lobe structures and medial thalamus. Clinical variables (i.e., symptom-specific severities) were associated with fALFF values across the different frequency bands. Our findings provide novel evidence about the nature and regional distribution of functional alterations in OCD, which should contribute to refine neurobiological models of the disorder. We suggest that the evaluation of the local attributes of BOLD signal across different frequency bands may be a sensitive approach to further characterize brain functional alterations in psychiatric disorders.
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Acknowledgments
This study was supported by the Carlos III Health Institute (PI09/01331, PI10/01753, PI10/01003, CP10/00604, PI13/01958, and CIBER-CB06/03/0034), FEDER funds (“a way to build Europe”), and the Agency for Administration of University and Research (AGAUR, Barcelona; 2014SGR1672). Dr. Soriano-Mas is funded by a “Miguel Servet” contract (CP10/00604), Dr. Real by a “Juan Rodés” contract (J14/00038) and Dr. Subirà by a “Rio Hortega” contract (CM15/00189) from the Carlos III Health Institute. Mr. Guinea-Izquierdo is supported by a Ministry of Education, Culture and Sport grant (FPU014/04822). Dr. Harrison is supported by a National Health and Medical Research Council of Australia (NHMRC) Project Grant (Grant # 1025619) and a NHMRC Clinical Career Development Fellowship (Grant # 628509). Dr. Sato is supported by Sao Paulo Research Foundation – Brazil (FAPESP Grant # 2013/10498-6); Dr. Hoexter is supported by Sao Paulo Research Foundation – Brazil (FAPESP Grant # 2013/16864-4).
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national: Institutional Review Board of Bellvitge University Hospital) and with the Helsinki Declaration of 1975, and the applicable revisions at the time of the investigation. Informed consent was obtained from all patients for being included in the study.
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Mònica Giménez and Andrés Guinea-Izquierdo contributed equally to the work
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Giménez, M., Guinea-Izquierdo, A., Villalta-Gil, V. et al. Brain alterations in low-frequency fluctuations across multiple bands in obsessive compulsive disorder. Brain Imaging and Behavior 11, 1690–1706 (2017). https://doi.org/10.1007/s11682-016-9601-y
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DOI: https://doi.org/10.1007/s11682-016-9601-y