What is eeg scan? Explain the wave patterns seen in an eeg scan.
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Answer Posted / Nilesh Kumar Borde
An EEG (Electroencephalogram) scan is a non-invasive diagnostic test used to evaluate brain activity by recording electrical signals produced by the brain. Electrodes are placed on the scalp to detect these electrical signals, which can provide information about the brain's electrical activity, function, and abnormalities.
In an EEG scan, various wave patterns are observed:
1. Alpha Waves (8-13 Hz): Produced during relaxation with eyes closed.
2. Beta Waves (14-30 Hz): Common in active thinking or focus.
3. Delta Waves (below 4 Hz): Associated with deep sleep.
4. Theta Waves (4-7 Hz): Observed during light sleep and daydreaming.
5. Gamma Waves (above 30 Hz): Involved in higher brain functions such as attention, learning, and memory.
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