Jacob Nachmias

Nachmias was a psychologist and long-serving professor at the University of Pennsylvania who made fundamental contributions to the science of visual perception and psychophysics, including forced-choice methods, signal-detection theory in vision, and the psychophysical characterization of spatial-frequency-selective channels in the visual system. He was elected to the National Academy of Sciences. Born to a Sephardic Jewish family that emigrated from Greece in 1939, he was Jewish.