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This device was developed in research supported in part by Pre-doctoral Fellowship MF-17372 to M. G. Saslow from the National Institute of Mental Health, USPHS, and in part by the following grants to D. Krech, M. R. Rosenzweig, and E. L. Bennett: Grant MH-1292 from the National Institute of Mental Health, USPHS; Grant GB-291 from the National Science Foundation; and Contract DA-49-193-MD-2329 from the Office of the Surgeon General.