that the shift in behavior toward greater carefulness also makes sense as an adaptation for caring for small children. Cultural significance Doug Jones, a visiting scholar in anthropology at Cornell University, said that the faces of monkeys, dogs, birds and even the fronts of cars can be made to appear cuter by morphing them with a "cardioidal" (heart-shaped) mathematical transformation. Jones said that negative cardioidal strain results in faces appearing less mature and cuter by causing facial features at the top of the face to expand outward and upward while causing features at the bottom of the face to contract inward and upward. Stephen Jay Gould said that over time Mickey Mouse had been drawn to resemble a juvenile more with a relatively larger head, larger eyes, a larger and more bulging cranium, a less sloping and more rounded forehead, shorter, thicker and "pudgier" legs, thicker arms and a thicker snout which gave the appearance of being less protrusive. Gould suggested that this change in Mickey's image was intended to increase his popularity by making him appear cuter and "inoffensive". Gould said that the neotenous changes to Mickey's form were similar to the neotenous changes that occurred in human evolution. Nancy Etcoff, Ph.D. in psychology from Boston University, said "cartoonists capitalize on our innate preferences for juvenile features", and she mentioned Mickey Mouse and Bambi as examples of this trend. She said Mickey Mouse's bodily proportions "aged in reverse" since his inception, because "[h]is eyes and head kept getting bigger while his limbs kept getting shorter and thicker", culminating in him resembling a "human infant". She further mentioned the "exaggerated high forehead" and the "doe eyes" of Bambi as another example of this trend. Mark J. Estren, Ph.D. in psychology from the University at Buffalo, said cute animals get more public attention and scientific study due to having physical characteristics that would be considered neotenous from the perspective of human development. Estren said that humans should be mindful of their bias for cute animals, so animals that would not be considered cute are also valued in addition to cute animals. The perception of cuteness is culturally diverse. The differences across cultures can be significantly associated to the need to be socially accepted. Cute animals Sherman, Haidt, & Coan (2009) used images of puppies and kittens for the study's "high cuteness" stimuli in two experiments. William R. Miller, assistant professor of