Early childhood physical

Early childhood physical - Excess exp-exp synapses Rat...

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1 Physical Development in Early Childhood Body size • About 5 pounds per year • 2-3 inches per year • Head size becomes more proportionate • Body slims down Brain development • Brain grows in spurts – Not new neurons – More blood vessels – More glial cells – More mylenation • Synaptic pruning – After age 2, more synapses are lost than gained – As many as 100,000 per second
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2 • Experience-expectant brain development – Development of universal skills in which excess synapses form and are pruned according to experience • Experience-dependent brain development – Development of specific skills in which new synapses form to code the experience. Fragile X • Inherited cause of MR in boys • Don’t produce FMRP – Protein necessary for pruning
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Unformatted text preview: Excess exp-exp synapses Rat study Young rats placed in stimulating cage had fewer synapses than rats in boring cage Adult rats placed in stimulating cage had more synapses than rats in boring cage 3 Nutrition in early childhood Important in physical and brain growth Preschoolers are picky Eat what others eat Malnutrition In U.S., 11% of families do not have enough food Much higher in developing world Related to: Stunted growth Lower intelligence Lower academic achievement Kwashiorkor: Adequate calories; low protein More common after 18 months Marasmus: Not enough calories More common in first year...
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This note was uploaded on 12/21/2010 for the course PSYCH 4 taught by Professor Ritabutterfield during the Fall '10 term at Santa Rosa.

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Early childhood physical - Excess exp-exp synapses Rat...

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