chance-05.11 - NEUROBIOLOGY & BEHAVIOR BIO SCI N110...

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NEUROBIOLOGY & BEHAVIOR BIO SCI N110 Spring Quarter 2009 May 11, 2009
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Stimulus presented to each eye individually rank recorded neurons (1-7) 1 = driven by contralateral eye 4 = equally driven by both eyes 7 = driven by ipsilateral eye
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inject radioactive proline into one eye - transported through LGN to V1 in V1, can see what fraction of neurons get inputs from which eyes
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autoradiogram of normal macaque monkey V1
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suture eye 2 wks old 18 mo
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Stimulus presented to each eye individually rank recorded neurons (1-7) 1 = driven by contralateral eye 4 = equally driven by both eyes 7 = driven by ipsilateral eye
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these experiments also illustrate that there is a period in development when circuits are especially vulnerable to perturbation this is called the “critical period”
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Martha Constantine-Paton implanted 3rd eye in tadpoles
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“BANDING” After crushing optic nerve @ 2 weeks No banding @ 4 weeks Reorganization begins TTX = blocks action potentials blocks reorganization NO TTX @6-7 Weeks Banding will return
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crush optic nerve @ 2 wks - banding is gone @ 4 wks - reorganization begins @ 6-7 wks - banding is again present
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chance-05.11 - NEUROBIOLOGY & BEHAVIOR BIO SCI N110...

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