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A) Reinforcement: spiking of neuron 2 stops the stimulation in neuron 0. The direct weight w0,2 grows faster than other weights, even when starting at a lower value. B) Artificially fixing the direct weight w0,2 to 0, a longer pathway of 2 connections 0 → 1 → 2 is established. C) Pruning: spiking of neuron 2 starts external stimulation to neuron 0. As a result, w0,2 is pruned.
