Hormones and cuteness variation There are suggestions that hormone levels can affect a person's perception of cuteness. Konrad Lorenz suggests that "caretaking behaviour and affective orientation" towards infants as an innate mechanism, and this is triggered by cute characteristics such as "chubby cheeks" and large eyes. The Sprengelmeyer et al. (2009) study expands on this claim by manipulating baby pictures to test groups on their ability to detect differences in cuteness. The studies show that premenopausal women detected cuteness better than same aged postmenopausal women. Furthermore, to support this claim, women taking birth control pills that raise levels of reproductive hormones detect cuteness better than same aged women not taking the pill. Sprengelmeyer gathered 24 young women, 24 young men, and 24 older women to participate in his study. He ran three studies in which images of white European babies were shown, and the participants were asked to rate them on a cuteness scale of one to seven. The study found differences among the groups in cuteness discrimination, which ruled out cohort and social influences on perceived cuteness. In the second study it was found that premenopausal women discriminated cuteness at a higher level than their postmenopausal female peers. This finding suggested a biological factor, which was then investigated further in the third study. Here, Sprengelmeyer compared cuteness sensitivity between premenopausal women who were, and were not taking oral contraceptives. The study concluded that post-perceptual processes were impacted by hormone levels (progesterone and estrogen specifically) in females, and thus impacted sensitivity to cuteness. Caregiving correlates A study by Konrad Lorenz in the early 1940s found that the shape of an infant's head positively correlated with adult caregiving and an increased perception of "cute". However a study by Thomas Alley found no such correlation and pointed out faulty procedures in that study. Alley's study found that cephalic head shape of an infant did induce a positive response from adults, and these children were considered to be more "cute". In his study, Alley had 25 undergraduate students rate line drawings of an infant's face. The same drawing was used each time, however the cephalic head shape was changed using a cardioidal transformation (a transformation that models cephalic growth in relation to ageing process) to adjust the perceived age; other features of the face were not changed. The study concluded that a large head shape increased perceived cuteness, which then elicited a positive