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      The brightness dimension as a marker of gender across cultures and age

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      1 , , 2 , 3 ,
      Psychological Research
      Springer Berlin Heidelberg

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          Abstract

          Universally, female skin color is lighter than male skin color, irrespective of geographical location. This difference is a distinctive and universal adaptive pattern that emerges after puberty. We address whether this sexual dimorphism is cognitively and culturally represented to ground gender. To this end, we examine a non-Western, non-industrialized population, namely the Wichí (Salta, Argentina) and a Western industrialized population (Spain). The two cultural populations included both adults and prepubescent children. Across two experiments, we utilized a novel task with children and adults who had to make a choice for a female (male) target person between two identical objects that differed only in terms of their brightness. The results in both experiments revealed that the children from the two cultural communities choose a lighter colored object for the female target and a darker version of the same object for the male target. This pattern held across cultures irrespective of the age of participants, except for the male Wichí participants. We discuss how sexual dimorphism in skin color contributes to a universal grounding of the gender category, and advance possible explanations as to why Wichi males did not consistently link gender and brightness.

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          The online version of this article (10.1007/s00426-019-01213-2) contains supplementary material, which is available to authorized users.

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          The evolution of human skin coloration.

          Skin color is one of the most conspicuous ways in which humans vary and has been widely used to define human races. Here we present new evidence indicating that variations in skin color are adaptive, and are related to the regulation of ultraviolet (UV) radiation penetration in the integument and its direct and indirect effects on fitness. Using remotely sensed data on UV radiation levels, hypotheses concerning the distribution of the skin colors of indigenous peoples relative to UV levels were tested quantitatively in this study for the first time. The major results of this study are: (1) skin reflectance is strongly correlated with absolute latitude and UV radiation levels. The highest correlation between skin reflectance and UV levels was observed at 545 nm, near the absorption maximum for oxyhemoglobin, suggesting that the main role of melanin pigmentation in humans is regulation of the effects of UV radiation on the contents of cutaneous blood vessels located in the dermis. (2) Predicted skin reflectances deviated little from observed values. (3) In all populations for which skin reflectance data were available for males and females, females were found to be lighter skinned than males. (4) The clinal gradation of skin coloration observed among indigenous peoples is correlated with UV radiation levels and represents a compromise solution to the conflicting physiological requirements of photoprotection and vitamin D synthesis. The earliest members of the hominid lineage probably had a mostly unpigmented or lightly pigmented integument covered with dark black hair, similar to that of the modern chimpanzee. The evolution of a naked, darkly pigmented integument occurred early in the evolution of the genus Homo. A dark epidermis protected sweat glands from UV-induced injury, thus insuring the integrity of somatic thermoregulation. Of greater significance to individual reproductive success was that highly melanized skin protected against UV-induced photolysis of folate (Branda & Eaton, 1978, Science201, 625-626; Jablonski, 1992, Proc. Australas. Soc. Hum. Biol.5, 455-462, 1999, Med. Hypotheses52, 581-582), a metabolite essential for normal development of the embryonic neural tube (Bower & Stanley, 1989, The Medical Journal of Australia150, 613-619; Medical Research Council Vitamin Research Group, 1991, The Lancet338, 31-37) and spermatogenesis (Cosentino et al., 1990, Proc. Natn. Acad. Sci. U.S.A.87, 1431-1435; Mathur et al., 1977, Fertility Sterility28, 1356-1360).As hominids migrated outside of the tropics, varying degrees of depigmentation evolved in order to permit UVB-induced synthesis of previtamin D(3). The lighter color of female skin may be required to permit synthesis of the relatively higher amounts of vitamin D(3)necessary during pregnancy and lactation. Skin coloration in humans is adaptive and labile. Skin pigmentation levels have changed more than once in human evolution. Because of this, skin coloration is of no value in determining phylogenetic relationships among modern human groups. Copyright 2000 Academic Press.
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            INCIDENTAL LANGUAGE LEARNING:. Listening (and Learning) out of the Comer of Your Ear

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              The Evolution of Human Skin and Skin Color

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                Author and article information

                Contributors
                carla.sebastian@gmail.com
                gun.r.semin@gmail.com
                Journal
                Psychol Res
                Psychol Res
                Psychological Research
                Springer Berlin Heidelberg (Berlin/Heidelberg )
                0340-0727
                1430-2772
                14 June 2019
                14 June 2019
                2020
                : 84
                : 8
                : 2375-2384
                Affiliations
                [1 ]GRID grid.119021.a, ISNI 0000 0001 2174 6969, Education Sciences, , Universidad de La Rioja, ; Calle Luis Ulloa 2, 26004 Logroño, Spain
                [2 ]GRID grid.410954.d, ISNI 0000 0001 2237 5901, William James Center for Research, ISPA - Instituto Universitário, ; Rua Jardim do Tabaco 41, 1149-041 Lisbon, Portugal
                [3 ]GRID grid.5477.1, ISNI 0000000120346234, Utrecht University, ; Utrecht, The Netherlands
                Author information
                http://orcid.org/0000-0002-5304-5566
                Article
                1213
                10.1007/s00426-019-01213-2
                7515938
                31201533
                e5859534-d054-49a0-a25b-f6f9a422faac
                © The Author(s) 2019

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

                History
                : 31 March 2019
                : 6 June 2019
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100001871, Fundação para a Ciência e a Tecnologia;
                Award ID: IF/00085/2013/CP1186/CT0001
                Award Recipient :
                Categories
                Original Article
                Custom metadata
                © Springer-Verlag GmbH Germany, part of Springer Nature 2020

                Clinical Psychology & Psychiatry
                Clinical Psychology & Psychiatry

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