playing back EEGs to cause beneficial cognitive effects using different voltages or currents to reach deeper into tissue, notably though some currents and voltages might verge into tDCS (although AC-like) which is a different thing; the previously
described gelatin capsule sized piezoelectric frond hair adhering and head skin seeking technology could also do some tDCS as well as EEG recording, playback and software based synthesis; children’s EEGs could also be played back at adults to find out
if there were child-mind effects as well as, just possibly, longevising, wellness, or healthspan effects (seems unlikely, but is possible), notably children have more delta waves, and these occur during sleep, although less so at older people, these
child EEG frequencies could be played back while adults sleep; this could be tested on rats, or some larger animal like cows, sheep, or horses

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