Development Spring 2009 TV 2

Development Spring 2009 TV 2 - Chapter 9: Development...

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Chapter 9: Development Revised Version for Thursday, March 19
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Updates and Announcements We need to skip Chapter 8 to stay on schedule. Abnormal sexual phenotype and homosexuality stuff will be covered in next unit (on Sex and Gender) Development will spill over into early next week, but we WILL finish CH 9 by the end of next week (so read ahead). Clickers: You only need to participate in 75% of the clicker activities in order to receive FULL (extra) credit. Because of the clicker conundrum during the first half of the term, everyone has full credit for that period, but you need to show up and participate for ¾ of the remainder of class days to ensure maximum extra credit for attendance.
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Nature-Nurture Issue To what extent is an individual’s development (e.g. of their personality, of psychological disorders, et cetera) determined by biology (nature) and to what extent is it determined by culture and environment (nurture)?
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Gestational Terms to Know Zygote: a fertilized egg Embryonic stage: 2 nd – 8 th week post- conception Fetal stage: 9 th week – birth Viability: The gestational age at which the baby would likely survive (with intensive medical care) if born prematurely Currently about 24-25 week in the US
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Down Syndrome (Trisomy 21) A genetic disorder involving three chromosomes (instead of the normal two) making up the 21 st chromosomal pair. Characteristic facial abnormalities, increased risk of heart deformities, mental retardation (all varying degrees) ALL develop Alzheimer’s in by their 40’s if they live that long.
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Teratogens Environmental factors (e.g. drugs, radiation, communicable diseases) that have the potential to harm the developing embryo/fetus.
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Fetal Alcohol Syndrome Teratogenic exposure to ethanol Associated with: Low birth weight Limb, head and face abnormalities Mental retardation (MR) FAS is the #1 cause of MR
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Plasticity Plasticity has to do with the adaptability of the various regions of the brain to take on a variety of functions. Brain plasticity helps a person recover from injury to the brain, and the more “plastic” the brain is, the more recovery can be expected. In general, younger brains are more plastic than older brains.
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Sensory Development: Seeing Vision: Babies are very nearsighted (myopic) at birth They have a hard time focusing due to lack of “convergence” (of the eyeballs) Young babies prefer to look at faces
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Development Spring 2009 TV 2 - Chapter 9: Development...

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