Faces Sex (image) Penn State Caption This shows facial features affected by the response-based imputed variable for sex. First row shows the range of facial features three standard deviations to either side of the mean in profile and full face. Second row shows (left to right) the proportion of the total variation, and three priamry facial shape change parameters:area ratio, curvature difference and normal displacement. Credit Shriver/Claes; Penn State Usage Restrictions Non commercial use only Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.