PSYC 311 1st EditionLecture 25Current LectureApril 30- Warfare, cont. o Economical bases for warfare Different people exploit similar aspects of the environment - Fishing rights, foreign vs. domestic energy Combined population of two groups is greater than ecological carrying capacity of environment - Assumption of superiority by aggressor o Japanese in WWII, Nazi request for Lebensraum Both cultures exploit resources that can be easily monopolized - Mid-eastern oil - Evidence on evolution of adaptive human traits o Human behavior and physical traits resulted from Need to adapt to drastic changes in environment (climate) - Sahara desert from Sahara forest Invasion of savannah Bipedal posture and locomotion - More efficient walking (hands free)- Allowed man to see over savannah grasses - Increased surface area for attachment of muscles that link hips to upper leg bones and lower back Tool making and usage- Development of sharp stone cutting edges, bow and arrow, spears/spearthrowers (atlatl) Increased dexterity - Thumbs – distance between thumb and other fingers of chimps were shorter, more curved, pointed o Better power grips and more precision Omnivorous status – agriculture, hunting/gathering, spices for preservation Pursuit of prey animals through cooperative hunting Gender specific division of labor- changes in anatomy and physiology Ability of group to hung species larger than man Language Information processing capabilities of advanced turbo CNS- Color vision, 3D vision, frontal evaluative cortex, memory, imagery, ability to share ideation o Selection for competing with carnivores Highly structured social organization - Presence of leaders Group territoriality Intense aggression toward strangers and competition from other species Killing of competitors High degree of intelligence - Infant care protection o Gender specific division of labor Women nurse/scare for young – bodies evolved to be able to give birth to big CNS youth Men evolved to hunt, defend hunting grounds, etc. o Prolonged protection/care of young by both genders Humans require years of nurturance and instruction to be able to reproduce in
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