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Sleep Stages EEG
AP Psychology · States of Consciousness
The Sleep Cycle

An Electroencephalogram (EEG) measures brain waves. Different stages of consciousness exhibit distinct waveform patterns (frequency and amplitude).

Select Stage
Tags
ConsciousnessEEGREMBrain Waves
Awake & Relaxed
Beta & Alpha Waves Conscious
When awake and alert, the brain emits high-frequency, low-amplitude Beta waves. As you relax and close your eyes, slower Alpha waves appear.
Wave Frequency (Hz)
13 - 30 Hz (Fast)
Wave Amplitude
Low Voltage
Key Characteristics
Normal consciousness, alertness, logical thinking.