Percent of neurons die as brain develops because

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between 20-80 percent of neurons die as brain develops, because  neurons connections are either wrong or cant find better targets hormones affect external anatomy normal development depends on nutrition of the mother Teratogens Give an example of  how teratogens in the  maternal blood  supply can influence  development. factors that disrupt development mostly due to environment: lead and mercury, alcohol, cigarette  smoke fetal alcohol syndrome: developmental disorder that affects children  whose mothers consumer alcohol during pregnancy. Its effects  include a range of psychological problems and physical abnormalities Infancy and  Childhood long period of  dependency=  good cuz we base  most stuff on  learning genetic and  environment  factors shape  childs learning,  such as 
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environment  (toxins=  retardation),  (stimulus  information like  toys you can  explore and  manipulate  simulate neural  growth)  Physical/ sensory  development growth in brain size and complexity and growth in body come in  spurts of every few months (around age 2,6,110, and 14) Sensory capacities:  Can tell difference between mothers voice and other See objects a foot away and can track moving stimulus with  eyes Cant really control body movements grasp reflex-  an infantile reflex in which an infant closes her  hand into a fist when her palm is touched rooting reflex-  in an infant, the sucking elicited by stroking  applied on or around the lips; the reflex aids breast-feeding sucking reflex-  an infantile reflect in which an infant sucks  on whatever is placed in his mouth Milestones for babies Newborns: some reflexes 3 months: roll over, track objects with eyes 5 months: reach/grasp objects, cooler perception 6: sitting up, vocal play 9: walking, babble, peek-a-boo 12 months: drink from cup first words Jean Piaget Theory Rejected nativism but wasn’t happy with empiricists view.   Constructivism Kids systematize knowledge as they grow and learn, not just learning facts This is possible because of maturation of cognitive structures (schemas,  operations) and the child’s experience.  It is a combination of empiricism  (complex structure in brain) and nativism (you already have a sense of what’s  going on) Anatomy + Logic.   How does learning  Assimilation:  put experience into existing knowledge and theory
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work? Accommodation:  change existing theory to fit new experience Children learn because they want to.  They are intrinsically motivated...they  are like scientists with no reward schedule required.  Pruning Do you still have  about the same  number of neurons 
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