KIN 210 Study Guide - Midterm Guide: Synaptic Pruning, Aging Brain, Limbic System
26 Sep 2017
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Brain at birth: cortical neuron number at 1 year = cortical neuron number at 2 years, still generate new neurons, 2 regions of brain : white & grey ( increase volume of both) Synaptic pruning: eliminates extra synapses, 2 years: twice as many synapses as an adult, the ones that aren"t eliminated are strengthened, myelination is at specific regions this is when they show signs of skill development. Critical periods: weight of brain at 6 is 90% accomplished ; maturation still needs to continue, puberty will initiate synaptic pruning which results in a mature brain. It is a neurotransmitters that gives us the feeling of pleasure: hypersensitive. Interacts with the limbic system helps with regulation and motivation of an individual. Mismatch development of teenagers: limbic system fully developed, pre-frontal area still developing (has not gone through synaptic pruning); white matter not fully developed, actions of teenagers mostly based on limbic system.
