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      The influence of leg-to-body ratio, arm-to-body ratio and intra-limb ratio on male human attractiveness

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          Abstract

          Human mate choice is influenced by limb proportions. Previous work has focused on leg-to-body ratio (LBR) as a determinant of male attractiveness and found a preference for limbs that are close to, or slightly above, the average. We investigated the influence of two other key aspects of limb morphology: arm-to-body ratio (ABR) and intra-limb ratio (IR). In three studies of heterosexual women from the USA, we tested the attractiveness of male physiques that varied in LBR, ABR and IR, using figures that ranged from −3 to +3 standard deviations from the population mean. We replicated previous work by finding that the optimally attractive LBR is approximately 0.5 standard deviations above the baseline. We also found a weak effect of IR, with evidence of a weak preference for the baseline proportions. In contrast, there was no effect of ABR on attractiveness, and no interactions between the effects of LBR, ABR and IR. Our results indicate that ABR is not an important determinant of human mate choice for this population, and that IR may exert some influence but that this is much smaller than the effects of LBR. We discuss possible reasons for these results, including the limited variability in upper limb proportions and the potentially weak fitness-signal provided by this aspect of morphology.

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          Confidence Intervals from Normalized Data: A correction to Cousineau (2005)

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            MHC heterozygosity confers a selective advantage against multiple-strain infections.

            Genetic heterozygosity is thought to enhance resistance of hosts to infectious diseases, but few tests of this idea exist. In particular, heterozygosity at the MHC, the highly polymorphic loci that control immunological recognition of pathogens, is suspected to confer a selective advantage by enhancing resistance to infectious diseases (the "heterozygote advantage" hypothesis). To test this hypothesis, we released mice into large population enclosures and challenged them with multiple strains of Salmonella and one of Listeria. We found that during Salmonella infections with three avirulent strains, MHC heterozygotes had greater survival and weight than homozygotes (unlike sham controls), and they were more likely to clear chronic Salmonella infection than homozygotes. In laboratory experiments, we found that MHC heterozygosity enhanced the clearance of multiple-strain Salmonella infections. Yet, contrary to what is widely assumed, the benefits of heterozygosity were due to resistance being dominant rather than overdominant, i.e., heterozygotes were more resistant than the average of parental homozygotes, but they were not more resistant than both. The fact that MHC heterozygotes were more resistant to infection and had higher fitness than homozygotes provides a functional explanation for MHC-disassortative mating preferences.
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              Elected in 100 milliseconds: Appearance-Based Trait Inferences and Voting

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                Author and article information

                Journal
                R Soc Open Sci
                R Soc Open Sci
                RSOS
                royopensci
                Royal Society Open Science
                The Royal Society Publishing
                2054-5703
                May 2018
                16 May 2018
                16 May 2018
                : 5
                : 5
                Affiliations
                [1 ]University of Cambridge , Cambridge, UK
                [2 ]Leverhulme Centre for Human Evolutionary Studies, University of Cambridge , Cambridge, UK
                [3 ]Department of Psychology, University of Cambridge , Cambridge, UK
                Author notes
                Author for correspondence: William J. Skylark e-mail: wjm22@ 123456cam.ac.uk

                Electronic supplementary material is available online at https://dx.doi.org/10.6084/m9.figshare.c.4085342.

                Article
                rsos171790
                10.1098/rsos.171790
                5990728
                56334657-9a5f-4ab1-8fc9-08ec9cc70471
                © 2018 The Authors.

                Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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                Categories
                1001
                205
                70
                Psychology and Cognitive Neuroscience
                Research Article
                Custom metadata
                May, 2018

                attractiveness,morphology,limb proportions
                attractiveness, morphology, limb proportions

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