PSYC1101_Biology_III

PSYC1101_Biology_III - activity a. Ex. People are better at...

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Plasticity 5/28/10 I. Plasticity: a property of the brain that allows it to change as a result of experience or influence a. The role of experience: genetic programming specifies the sequence of brain development 1. Ex. General vision has to develop before ability to see depth 2. However expression of the genes is fully dependent on the environment ii. Critical period: A period of time in which certain experiences have to occur for development to proceed normally 1. Ex. Genie neglect case 2. Ex. Wiesel & Hubel (1963)-visually deprived kittens from birth to 2-3 months of age in one eye a. Kittens who were visually deprived at this age were permanently blind in the deprived eye b. This effect was not present in adult cats who were visually deprived for a 2-3 month period iii. Learning 1. Primary source of physical change in the brain from learning is in the strength of synaptic connections a. Neurons that “fire together, wire together” iv. Culture 1. Cultural differences are related to different patterns of brain
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Unformatted text preview: activity a. Ex. People are better at classifying emotional expressions in their own cultural group i. This corresponds to higher levels of brain activity when viewing facial expressions from your own cultural group b. Plasticity in adulthood i. Plasticity is much greater in childhood than in adulthood ii. However, there is some neural plasticity in adulthood 1. Learning (fire together, wire together) a. Strengthening of synaptic connections 2. Neurogenesis a. The creation of new neurons in the brain b. Most active during prenatal development, but continues to some extent into adulthood c. Plasticity in response to brain injury i. If a portion of the cortex is injured, nearby grey matter can assume the function of the damaged area 1. Referred to as cortical reorganization 2. Begins immediately after injury and continues for years 3. Capability for cortical reorganization is much higher in children a. Ex. Radical hemispherectomy...
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PSYC1101_Biology_III - activity a. Ex. People are better at...

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