Question:
EEG alpha rhythm occurs in the frequency range
EEG alpha rhythm occurs in the frequency range
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The alpha rhythm is the classic EEG pattern observed during relaxed, wakeful states with the eyes closed. It oscillates within the 8 Hz to 13 Hz frequency band.
Updated On: Jun 23, 2026
- 0.5 - 4 Hz
- 8 - 13 Hz
- 4 - 7 Hz
- 30 - 50 Hz
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The Correct Option is B
Solution and Explanation
Concept:
Electroencephalogram (EEG) signals recorded from the scalp are categorized into distinct frequency bands that correspond to specific physiological states. These primary neurological bands include:
• Delta ($\delta$) band: $0.5\text{ Hz} - 4\text{ Hz}$ (associated with deep sleep).
• Theta ($\theta$) band: $4\text{ Hz} - 7\text{ Hz}$ (associated with drowsiness or light sleep).
• Alpha ($\alpha$) band: $8\text{ Hz} - 13\text{ Hz}$ (associated with relaxed, awake states with eyes closed).
• Beta ($\beta$) band: $14\text{ Hz} - 30\text{ Hz}$ (associated with active thinking and concentration).
• Gamma ($\gamma$) band: $> 30\text{ Hz}$ (associated with high-level cognitive processing).
Step 1: Identifying the Alpha frequency boundaries.
The alpha rhythm is centered within the 8 Hz to 13 Hz frequency range. It is most prominent in the occipital and parietal regions of the brain when a person is awake, relaxed, and resting with their eyes closed. The rhythm is quickly suppressed or attenuated when the person opens their eyes or engages in mental tasks, a phenomenon known as alpha blocking. This confirms Option (B) as the correct range.
• Delta ($\delta$) band: $0.5\text{ Hz} - 4\text{ Hz}$ (associated with deep sleep).
• Theta ($\theta$) band: $4\text{ Hz} - 7\text{ Hz}$ (associated with drowsiness or light sleep).
• Alpha ($\alpha$) band: $8\text{ Hz} - 13\text{ Hz}$ (associated with relaxed, awake states with eyes closed).
• Beta ($\beta$) band: $14\text{ Hz} - 30\text{ Hz}$ (associated with active thinking and concentration).
• Gamma ($\gamma$) band: $> 30\text{ Hz}$ (associated with high-level cognitive processing).
Step 1: Identifying the Alpha frequency boundaries.
The alpha rhythm is centered within the 8 Hz to 13 Hz frequency range. It is most prominent in the occipital and parietal regions of the brain when a person is awake, relaxed, and resting with their eyes closed. The rhythm is quickly suppressed or attenuated when the person opens their eyes or engages in mental tasks, a phenomenon known as alpha blocking. This confirms Option (B) as the correct range.
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