This research was supported by NIMH grant MH 40496. The authors gratefully acknowledge the assistance of Robert Adams, Ed Dana, Anthony Majoros, Leslie Munro, and Victoria Staples in data collection, Young-Way Liu for programming of on-line computer control, and Dr. William C. Williams for programming off-line computer scoring. We thank the Journal Associate Editor (Alvin Bernstein) and the Consulting Editors (David Siddle and two anonymous reviewers) for offering helpful suggestions and constructive criticism.