6.7.2 Electroencephalogram (EEG)

• What is an electroencephalogram (EEG)?

  Measures electrical brain activity
• EEG electrodes are placed on the scalp
• Alpha brain waves are associated with deep sleep.

  False
• What mental state is associated with beta brain waves?

  Alert, actively thinking
• Theta brain waves are characteristic of a drowsy state.
• Match the brain wave type with its frequency and state of consciousness:

  Alpha ↔️ 8-12 Hz, Relaxed

  Beta ↔️ 12-30 Hz, Alert

  Theta ↔️ 4-8 Hz, Drowsy

  Delta ↔️ 0.5-4 Hz, Deep sleep
• Order the brain waves from highest to lowest frequency:

  1️⃣ Beta

  2️⃣ Alpha

  3️⃣ Theta

  4️⃣ Delta
• How does EEG help diagnose seizures?

  Identifies high-frequency discharges
• Polysomnography, including EEG, is used to diagnose sleep disorders.
• EEG has high spatial resolution.

  False
• What is a major limitation of EEG in terms of data quality?

  Susceptible to artifacts
• EEG is a cost-effective brain imaging technique.
• EEG requires no expertise for proper interpretation.

  False