BIOL 115 Lecture Notes - Lecture 19: Pax6, Hominidae, Motor Learning
23 Jan 2018
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Document Summary
During this time period, early humans began to walk upright and make simple tools. Grew rapidly after birth and reached adulthood earlier than modern humans. Long, strong arms, curved fingers adapted for tree-climbing. Bipedalism: walking on two limbs instead of four. Proportions of arms/legs long arms are adaptive for climbing and swinging through trees. While a. afarensis was bipedal, changes in the proportion of arms/legs/torso wouldn"t occur until later. From 2 million 800,000 years ago: brain and body size increase. During this time period early humans spread around the globe, encountering many new environments on different countries. Greater use of tools and fire (though not yet controlled use) These challenges, along with an increase in body size, led to an increase in brain size. First human species to live outside of africa. Oldest known early humans with human-like body proportions. Expanded brain case relative to size of face. Longer legs, shorter arms relative to the torso.
