<p>Stem cells in a new brain are prolific, but in an adult brain, few neurons are produced and most stem cells remain inactive. It is from age 25 until about 55 (or later 50s) that we are at the seeming apex of our development as humans. Our sleep cycles remain constant, our hormones are also reliable, and we are relatively stable (barring insult). Inless otherwise mentioned herein, when EEG is referenced, in general, it is referenced in view of the normal, healthy adult bran.&nbsp;<br></p>