Quantitative EEG is a digital analysis of the brain's surface electrical activity, processed with mathematical algorithms that translate frequency bands and connectivity into a topographic map. A 2020 NIH review describes qEEG as complementary to conventional EEG and other diagnostic evaluations in neuropsychiatric care, used to add objective signal alongside the clinical interview and standardized testing.
At Stepwell, brain mapping is one of our diagnostic services, and the qEEG is one of four inputs in your comprehensive assessment, alongside pharmacogenetic testing, a neurofeedback baseline, and standardized psychological testing. The map is read by your care team to inform medication considerations and to set the starting parameters for neurofeedback if neurofeedback enters your plan. American Clinical Neurophysiology Society guidance frames qEEG as an aid to interpretation, not a stand-alone diagnostic instrument.
The recording itself is non-invasive. A clinician fits a soft cap of surface electrodes against your scalp using a small amount of conductive paste, and the recording captures 20 to 30 minutes of brain activity while you sit quietly. There are no needles, no medication, and no sedation. The map is then read together with your pharmacogenetic profile, neurofeedback baseline, and clinical interview at our Lakeway, Texas facility before any treatment plan is written.