McCraty R, Atkinson M, Rein G, Watkins AD Music enhances the effect of positive emotional states on salivary IgA. Sims Medicine 1996; 12: 167-175. Pallas SL Intrinsic and extrinsic factors that shape neocortical specification. Trends in Nemostiences 24:417-423. Petryshen, P., Stevens, B., Hawkins, J., & Stewart, M