12/22/2023 0 Comments Shaved chimpanzee conneticutThe ability to extract various information from faces plays a critical role in a wide range of social and emotional interactions. The display of their developmental stages through facial colour may help chimpanzees to induce appropriate behaviour from other individuals.įaces are a rich source of biological and social information such as age, identity, gender, emotional states, impressions and so on in humans 1, 2. Our results showed that chimpanzees use unique infantile facial coloration as a salient cue when discriminating between adult and infant faces. However, we found that facial coloration contributed to age categorisation in chimpanzees more than facial shape. Statistical image quantification analysis revealed significant differences both in shape and colour between adult and infant faces. Then, we tested how their age category judgments transferred to a series of morphed faces which systematically differed in facial shape and colour. We used a symbolic matching-to-sample task in which chimpanzees were trained to discriminate between adult and infant faces. The present study aimed to investigate the relative contributions of facial shape and colour to age categorisation in chimpanzees. However, it is unclear which features serve as critical cues for chimpanzees to recognise developmental changes in their faces. In addition, the infant faces of many primate species have unique skin coloration. Infant faces have peculiar morphological characteristics-relatively large eyes, a small nose, and small mouth-known as baby schema. Social primates must recognise developmental stages of other conspecifics in order to behave appropriately.
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