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Lecture 9

ANTH 239 Lecture 9: 9

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ANTH 239
Kimberly Garza

Between 7 and 11, the brain undergoes a huge spurt of growth of connections similar to that experienced between birth and 3 years of age Synaptic Pruning Majority of pruning is in the frontal lobes Loss of about 3% of grey matter Contains cell bodies and dendrites Myelination The second change is in myelination; in adolescene, it is not finished. The last part of the brain to myelinate is the frontal lobes. And myelination is not complete in the frontal lobes of the brain until around 18 to 20 or later Myelination on a neuron allows it to operate more efficiently Neurotransmitters All messages are passed to connected neurons through the form of chemicals called neurotransmitters Neurotransmitters and Risk Taking Dopamine - among other things, produces pleasure and desire through the reward system and is involved with social information processing. Significant changes in the amount and location of receptors at puberty Regions activated during exposure to social stimuli overlap with regions sensitive to reward system Social acceptance by peers seems to be processed in ways similar to other sorts fo non cocial rewards This helps to explain why risk taking happens in the context of peers Oxytocin influence on social memory, information processing, bonding Signifcant changes at puberty Influence on social memory, social information processing, and social bonding Explains adolescence heightened awareness Wrapping it up Some of the most imporatn changes in the brain occur between the ages of 10-20 Adolescent Brain Development Underdevelopment of the frontal lobe/prefrontal cortex and the limbic system make adolescent more prone to behave emotionally or impulsively Adolescents tend to use an alternative part of the brain the socio-emotional system rather than the cognitive-control system to process information Adolescent risk raking is far more likely to happen in groups Adolescent Brain Development Early adolescents are not very skilled at distinguishing the subtlety of facial expression (excitement, anger, fear, sadness, etc.)-results in a lot of miscuses
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