In the late 70s, Henri Begleiter and B. Porjesz at the State University of NY in Brooklyn attached electrodes to detect a brain wave, designated P300, to the scalps of 25 boys aged 7-13 who were sons of alcoholic fathers, with a control group of 25 boys who had no family history of drug or alcohol addiction.
None of the boys in either group had themselves ever used alcohol or drugs, and the researchers conducting the tests were “blind” to the family history of each boy. The goal was to explore electrophysiological “markers” to identify children at risk. They found that in response to visual stimuli, the sons of alcoholic fathers had a measurably lower amplitude of P300 brain waves. However, they cautioned that the results were not conclusive as a diagnostic predictor of later addictive behavior. Even so, the finding suggests that addiction is much more of a medical and genetic mystery than either the moralists or the self-help gurus can confidently address with didactic or formulaic solutions.
My point here is that every twist of mind that we experience, be it thought, emotion, imagination or whatever is simultaneously a neourchemical event in the brain, and these all give off brain waves, some of which we currently have the technology to detect with PET scanners, MRIs and the like, and some not. But I think it would be fascinating to find out if other psychic phenomena and mental illnesses also run in families, and there have been studies of that suggest that they do. The Amish and the Icelanders, for example, are excellent populations to study for two reasons. They’re very inbred and their societies are too close-knit to keep family “skeletons” in the closet, so there is data available there that would be very hard to come by in open societies. But I firmly believe that all these phenomena are legitimate fields for neurological and genetic research.