Memory in silent neurons: How do unconnected neurons communicate?

According to a generally-accepted model of synaptic plasticity, a neuron that communicates with others of the same kind emits an electrical impulse as well as activating its synapses transiently. This electrical pulse, combined with the signal received from other neurons, acts to stimulate the synapses. How is it that some neurons are caught up in the communication interplay even when they are barely connected? This is the chicken-or-egg puzzle of synaptic plasticity that a team is aiming to solve.

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