Why does long-term potentiation (LTP) in hippocampal neurons, crucial for memory consolidation, require repetitive synaptic stimulation at high frequencies?

💡 Explanation

LTP induction requires sufficient postsynaptic depolarization to remove the magnesium ion blocking the NMDA receptor channel, allowing calcium influx, because repetitive high-frequency stimulation is needed to achieve this threshold. Therefore, the magnesium block is relieved, rather than sodium channels being activated or direct spine size increase occurring immediately.

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