1. School of Psychological Sciences (Arad, Azriel, Lazarov, Bar-Haim), Sackler School of Medicine (Weiser, Bloch), and Sagol School of Neuroscience (Bar-Haim), Tel Aviv University, Tel Aviv, Israel; Section on Development and Affective Neuroscience, NIMH, Bethesda, Md. (Pine); Psychiatric Division, Sheba Medical Center, Ramat Gan, Israel (Sol, Weiser); Psychiatry Division, Sourasky Medical Center, Tel Aviv, Israel (Garber, Bloch).