Brain activity is not a precise meassure, not in terms of fMRI, which just shows an increased blood flow.<p>The hypothesis is obvious on the other hand. However, individuals that would submit to a test on psychedelics is likely the type that gets easily exited just for the sake of it and doesn&#x27;t. Or brain activity doesn&#x27;t corralate with actually functioning correctly. I&#x27; expect a failing subsystem would respond with increased activity, simple feedback. Eventually some controle unit would shut it off or the subsystem would keep working but a bit unusual, despite increased blood flow.