PSYC 1001 Chapter Notes - Chapter 3: Zygote, Thyroid Hormones, Impulsivity
7 Nov 2014
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Developing brain: brain grows from conception to adulthood, growth spurts involve different brain areas, 17 20 years, frontal lobes, ability to plan, control emotions, synaptic pruning from birth to around 10 years, dendrites, axons grow as synapses develop, myelination continues through adolescence. Neurons: soma: nucleus, sustaining functions, dendrites: receives signals, gila: glue, removes waste, axon: electrical transmission, myelin sheath: insulation, speeds up transmission, terminal buttons and synapses: chemical transmission to next neuron. Neurotransmitters: acetylcholine excites muscles, learning, dopamine excites and inhibits learning, attention, movement, reinforcement, norepinephrine eating, alertness, wakefulness, fear, epinephrine surges of energy anger, secrotonin mood, sleep, impulsivity, aggression, appetite, gaba (gamma aminobutyric acid) learning, thought, emotions, anxiety, endorphins pain, produce feelings of pleasure and well being like opiates. Genetic level of behavior: behavior genetics: influence of genetic factors on behavior, chromosomes: strands of dna carrying genetic information, human cells 46 chromosomes (23 sex cells, each chromosomes contains thousands of genes, dominant, recessive, homozygous, heterozygous, genotype/phenotype, polygenic inheritance.
