tag:blogger.com,1999:blog-7785493.post6365453315215502016..comments2024-01-04T04:11:55.717+02:00Comments on Dienekes’ Anthropology Blog: Why do we have chins? (Thayer and Dobson 2010)Dienekeshttp://www.blogger.com/profile/02082684850093948970noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-7785493.post-30402741721898946802010-06-04T01:09:18.271+03:002010-06-04T01:09:18.271+03:00"Southern Africans are extreme in their dimor..."Southern Africans are extreme in their dimorphism"<br /><br />According to an abstract statistical decomposition of profile shape at a single location on the jaw. <br /><br />Looking at actual mandibular <a href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1468021/" rel="nofollow">measurements</a>: <i>"The Spitalfields sample exhibits higher sexual dimorphism than the Zulu sample in all of the variables apart from the heights of the mandibular notch and ramus."</i>n/ahttps://www.blogger.com/profile/02378473351485233448noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-21015089428199036592010-06-02T11:58:57.182+03:002010-06-02T11:58:57.182+03:00Sexual selection explains the presence of sexual d...Sexual selection explains the presence of sexual dimorphism in chin development, but it doesn't necessarily explain the emergence of human chin in the first place. So the statement "While the sexual selection hypothesis predicts dimorphism in chin shape, most biomechanical hypotheses <b>preclude</b> it" (emphasis mine) in the abstract is wrong: sexual selection may be responsible only for a small proportion of the human chin evolution.Onur Dincerhttps://www.blogger.com/profile/05041378853428912894noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-53000541596369114902010-06-02T11:29:46.109+03:002010-06-02T11:29:46.109+03:00Surely adult male human chins are naturally obscur...Surely adult male human chins are naturally obscured by hair - as shown by the two gentleman on either side of this blog. This must significantly reduce the opportunity for sexual selection.Andrew Millardhttps://www.blogger.com/profile/08035606100093142182noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-45738018135394175662010-06-02T01:36:21.246+03:002010-06-02T01:36:21.246+03:00Does the research show any connection between test...Does the research show any connection between testosterone levels and chin structure? If there is a positive correlation between chin size and testosterone levels then this may explain why women don't like men with very exaggerated chins since high levels of testosterone can have a negative effect on the immune system.Average Joehttps://www.blogger.com/profile/12203996329459638052noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-79100637576515722352010-06-02T01:35:07.977+03:002010-06-02T01:35:07.977+03:00There has not to be any adaptative reason: it is p...There has not to be any adaptative reason: it is probably just a random accident of evolution: a founder effect at the origins of Humankind or a coalescent accident after long drift in a small distinct population.Majuhttps://www.blogger.com/profile/12369840391933337204noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-80154068202791777342010-06-01T21:51:56.087+03:002010-06-01T21:51:56.087+03:00This comment has been removed by the author.Ebizurhttps://www.blogger.com/profile/16925110639823856429noreply@blogger.com