Question:
In an E.E.G, this type of waves are present in the persons who are drowsy/sleepy with closed eyes:
In an E.E.G, this type of waves are present in the persons who are drowsy/sleepy with closed eyes:
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Alpha waves (8--13 Hz) are seen in relaxed individuals with closed eyes. Beta waves indicate alertness, while Delta waves indicate deep sleep.
Updated On: Jun 17, 2026
- Alpha waves
- Beta waves
- Theta waves
- Delta waves
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The Correct Option is A
Solution and Explanation
Concept:
Electroencephalography (EEG) records the electrical activity of the brain. Different brain states produce different types of waves, each having characteristic frequencies.
Step 1: Understanding EEG waves.
The major EEG waves are:
• Alpha waves
• Beta waves
• Theta waves
• Delta waves Each wave is associated with a particular mental or physiological state.
Step 2: Characteristics of Alpha waves.
Alpha waves have frequencies ranging approximately from 8 to 13 Hz. These waves are typically observed when a person is:
• Awake but relaxed
• Resting quietly
• Drowsy
• Sitting with eyes closed Therefore, alpha waves are characteristic of relaxed wakefulness.
Step 3: Why other options are incorrect.
• Beta waves occur during alertness and active concentration.
• Theta waves are common during light sleep.
• Delta waves occur during deep sleep. Hence, the waves associated with drowsy individuals having closed eyes are Alpha waves.
Step 1: Understanding EEG waves.
The major EEG waves are:
• Alpha waves
• Beta waves
• Theta waves
• Delta waves Each wave is associated with a particular mental or physiological state.
Step 2: Characteristics of Alpha waves.
Alpha waves have frequencies ranging approximately from 8 to 13 Hz. These waves are typically observed when a person is:
• Awake but relaxed
• Resting quietly
• Drowsy
• Sitting with eyes closed Therefore, alpha waves are characteristic of relaxed wakefulness.
Step 3: Why other options are incorrect.
• Beta waves occur during alertness and active concentration.
• Theta waves are common during light sleep.
• Delta waves occur during deep sleep. Hence, the waves associated with drowsy individuals having closed eyes are Alpha waves.
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