A cross-sectional study exploring the relationship between symptoms of anxiety/depression and P50 sensory gating in adult patients diagnosed with chronic fatigue syndrome/myalgic encephalomyelitis. — CFSMEATLAS
A cross-sectional study exploring the relationship between symptoms of anxiety/depression and P50 sensory gating in adult patients diagnosed with chronic fatigue syndrome/myalgic encephalomyelitis.
Liu, Xinyi, Liu, Sitong, Ren, Runtao et al. · Frontiers in neuroscience · 2023 · DOI
Quick Summary
This study looked at 249 people with ME/CFS to understand how anxiety and depression relate to a specific brain activity pattern called P50 sensory gating. Researchers used questionnaires to measure anxiety and depression, and brain scans (EEG) to measure how well the brain filters out repetitive sounds. They found that abnormal filtering of sounds was linked to anxiety, depression, and fatigue severity.
Why It Matters
Understanding the relationship between psychiatric symptoms and brain sensory processing in ME/CFS may help explain why many patients experience overlapping anxiety and depression, and could point toward new treatment approaches targeting brain function rather than treating mood symptoms in isolation.
Observed Findings
17.3% of patients showed no anxiety or depression using strict cutoff scores; 69.5% had no mental health problems on the SCL-90-R screening
Significant correlation found between somatization scores and P50 sensory gating ratio in both overall sample and no-anxiety/depression subgroups
Regression analysis identified anxiety and depression as risk factors for abnormal P50 sensory gating ratio
P50 sensory gating abnormalities were significantly associated with fatigue, anxiety, and depression severity
Inferred Conclusions
Brain sensory processing abnormalities (P50 SG dysfunction) may be involved in the mechanism underlying ME/CFS and its associated psychiatric symptoms
Anxiety and depression are significant risk factors linked to abnormal sensory gating in ME/CFS patients
P50 sensory gating ratio may have value for understanding disease mechanisms, patient classification, treatment selection, and prognosis, though not for diagnosis
ME/CFS should be considered a potential functional neurological disorder with measurable brain processing abnormalities
Remaining Questions
Does abnormal sensory gating precede the development of anxiety/depression in ME/CFS, or do these symptoms develop first and then alter brain function?
What This Study Does Not Prove
This study does not prove that anxiety and depression cause abnormal sensory gating, or vice versa—the correlation could reflect a shared underlying biological mechanism. It also does not establish that P50 sensory gating is useful for diagnosing ME/CFS, nor does it explain whether psychiatric symptoms are primary features of ME/CFS or secondary consequences of the illness.