Which of the following techniques is used to measure the variations in the activity of Ascending Reticular Activating System (ARAS)?
Show Hint
- ECG
- PET
- fMRI
- EEG
The Correct Option is D
Solution and Explanation
Step 1: Understanding ARAS.
The Ascending Reticular Activating System (ARAS) plays a crucial role in regulating wakefulness and alertness. To measure its activity, various brain imaging techniques are used.
Step 2: Analyzing the options.
- (A) Incorrect, ECG (Electrocardiogram) measures heart activity, not brain activity.
- (B) Incorrect, PET (Positron Emission Tomography) is used for imaging metabolic activity in the brain but is not specifically designed for measuring ARAS.
- (C) Incorrect, fMRI (functional Magnetic Resonance Imaging) detects brain activity by measuring blood flow but is not typically used for ARAS specifically.
- (D) Correct, EEG (Electroencephalogram) is a technique that directly measures electrical activity in the brain, including that of the ARAS.
Step 3: Conclusion.
Thus, the correct answer is (D) EEG.
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