Eye tracking, attention, and schizotypal symptoms in nonpsychotic relatives of patients with schizophrenia.
Keefe RS, Silverman JM, Mohs RC, Siever LJ, Harvey PD, Friedman L, Roitman SE, DuPre RL, Smith CJ, Schmeidler J, et al. Arch Gen Psychiatry. 1997 Feb; 54(2):169-76.