The point of the experiment isn't the sound itself, however, it's carefully timing the sounds to the allegedly correct part of the alpha brainwave cycle. That'

The point of the experiment isn't the sound itself, however, it's carefully timing the sounds to the allegedly correct part of the alpha brainwave cycle. That's why the participants were wearing EEG headbands for the study. By having a sham treatment with random sound timing, you capture the baseline effect of the sound in both the experiment and control, leaving the timing as the experimental variable.