PSYC 210 Lecture Notes - Lecture 4: Myelin, Occipital Lobe, Parietal Lobe
3 Dec 2017
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Proximodistal - center of torso to tips of fingers. Grow about 3/4 inch per month first year. By 2 years, infants weigh about 26 to 32 pounds, average 32-35 inches tall. At birth, weighs about 25% of adult weight. By 2nd birthday, weighs about 75% of adult weight. 4 lobes - frontal lobe, temporal lobe, parietal lobe, occipital lobe. Lateralization - specialization of function in one hemisphere or the other of the brain. Axon - carries signals away from the cell body. Dendrites - carry signals toward the cell body. Myelin sheath - provides insulation, helps signals travel faster. Terminal buttons - at end of axon, release neurotransmitters into synapses. Unused connections are replaced by other pathways or disappear. By 6 months, the majority of infants sleep throughout the night. Highest cause of infant death in the united states. Rates decrease when infants sleep on their backs. Infants motivated to move by something in the environment.
