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Frequency-specific alternations in the moment-to-moment BOLD signals variability in schizophrenia

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Abstract

Variability of neuronal activity is considered as the fundamental mechanism for the flexible and optimal brain function. Moreover, different frequency neuro signal is related to specific function. While little is currently known regarding changes in spontaneous BOLD variability of schizophrenia. The current study used resting-state fMRI data from 53 chronic schizophrenic subjects and 67 healthy subjects to investigate this issue. The data-driven method was used to measure the BOLD variability (MSSD: mean square successive difference) in two different frequency bands respectively (slow-5: 0.01–0.027 Hz; slow-4:0.027–0.073 Hz). Schizophrenic subjects exhibited decreased BOLD variability in thalamus region, sensorimotor and visual networks, and increased BOLD variability in salience network compared to matched healthy controls. Moreover, the interaction effects between frequency and group were observed in thalamus and right dorsolateral prefrontal cortex (DLPFC). These findings identified that altered BOLD variability is frequency dependent in schizophrenia. Importantly, the severity of patients’ negative symptom was related to the increased BOLD variability of DLPFC within slow-4 frequency band, highlighting the evidence that abnormal BOLD variability of frontal cortex is likely to have effects on the pathophysiology of negative symptom in schizophrenia.

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Acknowledgments

This study was funded by the National Nature Science Foundation of China (grant number: 81801775; 31700947) and Advanced Talents Introduction Program of Chengdu Normal University (YJRC2017-4).

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Youxue Zhang had made a substantial contribution to the conception and drafting and revising the article; Youxue Zhang, Rui Yang and Xueli Cai had made a substantial contribution to the analysis and interpretation of the data, and then they gave final approval of the version to be published.

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Correspondence to Youxue Zhang.

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All procedures performed in study involving participants were in accordance with the ethical standards of the Institutional Review Boards (IRB) o the USA.

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Informed consent was obtained from all subjects included in the study.

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Zhang, Y., Yang, R. & Cai, X. Frequency-specific alternations in the moment-to-moment BOLD signals variability in schizophrenia. Brain Imaging and Behavior 15, 68–75 (2021). https://doi.org/10.1007/s11682-019-00233-1

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  • DOI: https://doi.org/10.1007/s11682-019-00233-1

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