1856 — Hermann von Helmholtz published his research on the physiology of stereoscopic vision.
1860 — George F. Stout was born. Stout was primarily known for his psychology textbooks, especially his Manual of Psychology (1899), and for the doctrine of conation, a theory of mental processes that incorporated thinking, feeling, and motivational factors.
1906 — Clarence H. Graham was born. Graham won the APA Distinguished Scientific Contribution Award in 1966 for his classic studies of color vision and studies of characteristics of achromatic vision such as critical flicker frequency, luminosity curves, and the area-intensity problem.
1943 — Patrick H. DeLeon was born. DeLeon, a clinical and forensic psychologist and executive assistant to U.S. Senator Daniel K. Inouye, has provided an informed influence on the congressional treatment of psychological services in public health policy. APA Award for Distinguished Service in the Public Interest, 1984; APA Distinguished Professional Contribution Award, 1986 and 1989. APA President, 2000.
1953 — The antiepileptic drug Dilantin (phenytoin; Parke-Davis) was approved for use by the U.S. Food and Drug Administration. Phenytoin appears to control seizures by promoting sodium efflux from neurons, increasing the threshold of stimulation for neural firing.
1988 — The APA agreed to take over publication of the Clinician’s Research Digest from the Relational Dynamics Institute. The agreement took effect on July 1, 1988. George Stricker was the first editor under APA ownership.