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An electroencephalography cap is a head-worn device that holds EEG electrodes in set positions on the scalp. It helps record electrical activity from the brain during an EEG test. The cap may use wet electrodes with conductive gel or dry electrodes depending on the system. EEG caps are used by trained clinicians, technologists, and researchers to support brain activity recording.
read more about electroencephalography cap ...An electroencephalography cap is used to help place multiple electrodes quickly and consistently for EEG recording. It may be used during evaluation for seizures, epilepsy, sleep disorders, altered awareness, brain injury, or other neurologic concerns. Research systems may use high-density caps with many electrodes to study brain activity in more detail. The cap records signals, but a clinician interprets the EEG with symptoms, history, and other tests.
The cap positions electrodes over specific scalp areas so tiny electrical signals from brain activity can be detected. Conductive gel, paste, saline, or dry electrode contact helps reduce resistance between the scalp and electrode. The signals are amplified and displayed as wave patterns on a computer. Good contact and low electrical noise are important for readable results.
EEG caps can be wet, dry, semi-dry, disposable, reusable, low-density, or high-density. Wet caps usually need gel or paste to improve signal quality. Dry caps may be faster to set up but can be more sensitive to movement or contact issues. The number and placement of electrodes depend on the exam type, age, head size, and clinical or research protocol.
EEG caps are noninvasive and do not send electricity into the brain. Skin irritation, gel residue, pressure marks, or discomfort can happen, especially during longer recordings. Signal quality can be affected by loose electrodes, hair products, sweating, movement, blinking, muscle activity, or poor scalp contact. Seizures, loss of consciousness, or concerning neurologic symptoms should be evaluated by medical professionals rather than relying on EEG cap data alone.
No. An EEG cap records electrical activity patterns from the brain, but it does not read thoughts or memories.
No. It is usually painless, though gel, pressure, or long setup time can feel uncomfortable for some patients.
Standard EEG caps use surface electrodes on the scalp, not needles. Some specialized monitoring uses other electrode types, but that is different from a routine EEG cap.
Yes. Thick hair, oils, styling products, or poor electrode contact can affect signal quality. Patients may receive preparation instructions before the test.
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EEG. MedlinePlus Medical Encyclopedia. https://medlineplus.gov/ency/article/003931.htm. Date Accessed June 18, 2026.
EEG (Electroencephalogram). Mayo Clinic. https://www.mayoclinic.org/tests-procedures/eeg/about/pac-20393875. Date Accessed June 18, 2026.
Electroencephalogram. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK563295/. Date Accessed June 18, 2026.
EEG (Electroencephalogram). NHS. https://www.nhs.uk/tests-and-treatments/electroencephalogram/. Date Accessed June 18, 2026.