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| Mechanism for “winner-take-all” (open
eye) and synapse elimination (closed eye): |
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| -Cooperative,
synchronous firing and
competition (Hebb; LTP) |
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| -Postsynaptic NMDA receptors
open |
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| -Neurotrophins from
postsynaptic cell released and taken up by active |
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| presynaptic
terminals (ones that are strongly firing, cooperatively |
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| -Neurotrophins act on presynaptic axons,
axon arbors branch and expand |
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