> Before the advent of the pharmacological revolution, it was widely understood that brain activity depends on both chemical and electrical signals. The subsequent dominance of pharmacology almost obliterated interest in the electrophysiology of the brain for several decates.

From The Body Keeps the Score by Bessel van der Kolk, M.D., in a section about "Applied Neuroscience" as it pertains to resolving trauma. It seems that the wave properties of the brain have been under-valued since psychopharmacology really took off in the 70s.