psy2_lec6_physcogdev - Early physical and cognitive...

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Early physical and cognitive development
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Prenatal development s The odds of being you b 1,000 follicles per menstrual cycle… s 400 mature eggs in a woman’s lifetime b 200 million sperm start a journey… s But most die or get lost s Y sperm and X sperm
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Prenatal development: stages s Zygote: first 2 weeks b Morula: ~16 cells s About 60% don’t survive
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Prenatal development: stages s Embryo: through week 8 b Implanted in uterine wall: ~10-14 days s Outer layer of cells becomes placenta s Day ~16-24: neural tube b Week 4: heartbeat b Week 8: 1 inch long s Early reflexes
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Prenatal development: stages s Fetus: 9 weeks b 12 weeks: external genitals b 16 weeks: 250,000 new neurons/minute s synaptogenesis b 25 weeks: viable b 27 weeks: neurogenesis slowed s responds to light b 32 weeks: neural circuits like newborn’s s Taste, smell, hearing
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Prenatal development: environment s Mother’s diet b Proteins, fats, energy b Vitamins (e.g., folate) b Minerals (e.g., sodium, potassium) s Mother’s stress b Chronic high cortisol constricts blood vessels
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psy2_lec6_physcogdev - Early physical and cognitive...

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