An experimental test battery designed to measure several perceptual abilities was administered to 1,368 (51.8% male) paying clients of the Johnson O'Connor Research Foundation (JOCRF) in an effort to identify and measure three perceptual abilities: (1) flexibility of closure; (2) speed of closure; and (3) spatial scanning. Subjects, who ranged in age from 14 to 69 years, also took the standard JOCRF battery. The experimental battery consisted of eight worksamples--six designed by the Educational Testing Service, and two developed within the JOCRF. Internal structure analyses of the tests indicated that the following worksamples had moderately high reliabilities: (1) Maze Tracing; (2) Hidden Patterns; (3) Drawing; and (4) Concealed Words. The experimental tests considered jointly were found to measure three distinct factors: (1) one represented by Gestalt Completion, Snowy Pictures, and Concealed Words; (2) a second measured by Hidden Patterns, Hidden Figures, Drawing, and Tactics; and (3) a third represented by Maze Tracing. The perceptual ability factors studied were not measured by the JOCRF standard battery. The Concealed Words Test, the Hidden Patterns Test, and Maze Tracing Speed Test were found to be the most suitable perceptual abilities measures; they may be useful additions to the standard JOCRF battery. Twenty-two tables and 16 figures present study data. (SLD)