This study measured the extent to which subjects were able to unconsciously detect another person covertly staring at them from a distance. A video camera was focused on the subject while a person in another room (the observer) concentrated on the image of the subject as displayed on a color monitor This procedure was used to preclude any direct sensory contact between the two participants; the subjects were unaware of when they were being observed. A microprocessor controlled the experiment, recording and averaging the skin conductance level (SCL) of the subject during a random sequence of 30-s periods in which the video monitor was either activated or shut off. There was a total of 16 periods of covert observation (monitor on) and 16 control periods (monitor off) per session. Thirty-nine subjects participated in a total of 48 experimental sessions. As pre dieted, SCL during the covert observation periods was significantly greater than during the control periods, (t(47) = 2.652, P <.005). Twenty-six subjects (66.7% of the total number) showed greater SCL during observation than during the control condition; only 13 subjects (33% of the total number) showed greater SCL in the covert observation condition than the control condition.