BIOMARKER OF COGNITIVE FATIGUE

 A

The biomarker identified by Stefanie Linnhoff and colleagues is:

👉 The “frontal aperiodic exponent” in EEG brain activity

What that means (simply):

• It’s a measure derived from EEG (brainwave recordings).

• It reflects the balance between excitation and inhibition in the brain, especially in the frontal (prefrontal) region.

🔬 Key finding:

• People with higher cognitive fatigue show lower (flatter) frontal aperiodic exponent values.

• This indicates an altered brain activity balance, linked to mental exhaustion. (Cambridge University Press & Assessment)

🧠 Why it matters:

• It provides an objective, measurable signal of cognitive fatigue (instead of relying only on self-reports).

• It works across conditions like long Covid and multiple sclerosis, making it a transdiagnostic biomarker. (Cambridge University Press & Assessment)

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📌 In one line:

The biomarker is an EEG-based measure—specifically the frontal aperiodic exponent—that reflects disrupted brain activity linked to cognitive fatigue.

If you want, I can explain it in even simpler terms (like a quick analogy).