People don't keep their heads still when looking to one side, and other people can tell

Twenty pairs of photographs were made of adults looking 25 degrees to the l eft and 25 degrees to the right while attempting to face forwards. The eye regions of each photograph were concealed. Twenty adults attempted to sort each pair into left-looking and right-looking pictures. They were successfu l 65% of the time, p < 0.001. This suggests models have difficulty looking to one side without a perceptible head turn or comparable facial cue. This previously unrecognised phenomenon has implications for research on detecti on of gaze.