Eye tracking task results.
Across both measures, there were main effects of sex: females (gray) > males (red), *ps < 0.05. Error bars reflect standard error of the mean. (a) Look durations to faces. (b) The eye-mouth index (EMI) reflects the relative amount of time looking to the eye and mouth regions of the face, with values of .50 indicating equal looking to eyes and mouth and values above .50 indicating more looking to the eyes.