Psychology 3845 Lecture Notes - Lecture 5: Umbilical Cord, Bifidobacterium, Anise
17 Dec 2016
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Ofte(cid:374) thi(cid:374)k of hu(cid:373)a(cid:374) (cid:271)irth as (cid:858)diffi(cid:272)ult (cid:271)irth(cid:859) The shift to a bipedalism stance, bowl shaped pelvis is how we get an obstetric dilemma. A. afarensis squished down, a lot smaller . H. sapiens needs to rotate a lot in order to get out (comes out facing downwards) needed assistance throughout time during the birthing process. Female: wider pelvis does not allow you to run as fast (constraint) Correlation between pelvis shape and if you have a smaller head and if you are taller or shorter. Female: short round shape pelvis / tall heart shape pelvis. Male: short round shape pelvis / tall heart shape pelvis. Assuming that somehow selection is primarily on the pelvis for bio-mechanical reason. But for females the selection is based on how to move effectively and how to give birth effectively. Women has been selected to be good at both of these things (moving and birthing)
