Electrical Activity Frequency Power Spectrum Analysis (EEG)

What This Test Measures

The test analyzes the power distribution of brain wave frequencies (e.g., delta, theta, alpha, beta) recorded during an EEG. It quantifies how often certain frequency ranges appear in your brain activity, which can reflect underlying brain function or pathology.

How the Test Works

During an EEG, electrodes are placed on your scalp to detect electrical signals. The test then processes these signals into a power spectrum, breaking down brain wave activity into frequency bands (e.g., slow waves vs. fast waves). This helps identify patterns or imbalances in brain electrical activity.

Common Uses

EEG power spectrum analysis is often used to diagnose conditions like epilepsy, sleep disorders, brain injuries, or developmental delays. It may also help evaluate brain function in cases of headaches, seizures, or neurological symptoms without clear causes.

What to Expect

You’ll lie down with electrodes attached to your scalp while resting or performing simple tasks. The test typically lasts 20–60 minutes. No special preparation is needed, but avoid caffeine or bright lights before the procedure.