16 plasticity and deprivation

16 plasticity and deprivation - Research positions in the...

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3/28/11 1 Research positions in the B.A.B.Y. Lab http://babylab.psych.cornell.edu Applications are in the “research opportunities for students” section 2 Experience-expectant systems • Typical mechanisms: –Overproduction of synapses, followed by experienced-based selection (pruning) –Hebbian synapses • Timescale: –Early in development (sensitive period) • Evidence: –Deprivation causes changes in morphology of system and long-term impairment in behavior –Abnormal experience => abnormal pattern of neural organization 3 Experience-expectant systems • Examples : –Development of ocular dominance columns –Development of sensitivity to orientation of line • Visual cortex dendrites mirror experienced line orientation –detection of movement –Motor coordination in walking • Implications : –Genes produce “rough outline” of system (but watch the level…) –System completed/tuned through experience –Sources of stimulation are stable over evolutionary time 4 Categories of plasticity (Greenough) • Adaptations for incorporating information from the environment • Experience-dependent plasticity –Environmental info stored for later use –Examples: learning, memory formation 5 Experience-dependent systems • Typical mechanisms: –Generation of new dendritic growth/synaptic connections in response to stimulation/event
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This note was uploaded on 06/01/2011 for the course PSYCH 2090 taught by Professor Goldstein, m during the Spring '07 term at Cornell.

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16 plasticity and deprivation - Research positions in the...

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