Unit 4 Scientific Approaches Chapter 17 Evolutionary psychology

Human behaviors evolved from bio processes and natural selection Culture also evolved to benefit individuals and the population

Human evolution Common ancestor of apes and humans 7-9 mya Diverged Human ancestors from Africa Family Hominidae Genus Ardipithecus Genus Australopithecus Homo naledi (discovered in 2015)

Meet Ardi and Lucy

Ardi vs Lucy Ardipithecus ramidus Found in 1992 Found in Ethiopia 4.4 mya 50kg Small brain, bipedal, big toe opposable, omnivore Australopithecus afarensis Found in 1974 Found in Kenya, Ethiopia, and Tanzania 3.2 mya 30kg Small brain, bipedal

Bipedal walking Spinal column attached to base and center of skull Pelvic structure Fossil footprint

Homo naledi Found in South Africa in 2015 Lived after Lucy and before Homo erectus Taller than Lucy, shorter than H. erectus Had curved fingers and slightly curved toes

Larger brain size Homo erectus Flatter face Smaller teeth Athletic body Hunted, used fire, made tools, ran

Ice ages Human groups adapted to colder climates Neanderthals (pre homosapiens) were bigger boned, stalky, and used spears Cro-Magnon man (ancestors of modern humans) were slimmer, taller, and used more complex tools