“You can see a very strong modulation, which is always there. As the modulation gets to be more profound, it eventually flattens out, and that’s when the brain reaches the deeper state,” Brown says.
When the amount of drug was reduced, the amplitude of the alpha waves began to increase again.
The researchers also found a distinctive pattern in the slow and delta waves seen in the patients’ EEG readings. Slow and delta oscillations are the slowest brain waves, and as the amount of drug was increased, the frequency of these waves became slower and slower, reflecting a decrease in brain activity.
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