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Chapter 12

Psychology 1000 Chapter 12: Psych - Chapter 12
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Department
Psychology
Course Code
Psychology 1000
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Dr.Mike

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Description
Chapter 12 Development over the Lifespan Developmental psych examines changes in our biological, physical, psychological, and behavioural processes as we age Research designs used: Cross sectional design compare people of different ages at same point in time o Quick o Drawback people grow up in different historical ages, ex. Are young people actually smarter than old ones or is it just that the old people grew up in poorer environments (less education, less medical care, etc. In 1950s) Longitudinal design repeatedly test same cohort as they age o Ensures everyone exposed to same historical time frame o Time consuming o Some people die, drop out of study, etc. o Some things can be unique to cohort Sequential design combines the 2, repeadetly test several age cohorts as they grow older o Best one o Time consuming PRENATAL DEVELOPMENT 3 stages Germinal stage first two weeks, begins with sperm fertilizing egg making a zygote o After many divisions, becomes a mass of cells and attaches to uterus after about 2 weeks Embryonic stage 2 to 8 weeks after conception o Mass of cells called embryo o Placenta forms allows nutrient flow from blood to umbilical cord o Umbilical cord blood vessels that carry nutrients and oxygen to embryo, and waste products from embryo to mother o Organs develop, heart starts beating, brain starts forming, features begin Fetal stage after 9 weeks o Muscles become stronger, development o 24 weeks eyes open o 28 weeks age of viability Genetics and Sex Determination Sperm and egg have 23 chromosomes Zygote has 23 pairs of chromosomes
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