Answer:
The reason that the effects of long-term potentiation (LTP) at one synapse on a neuron do not spread to nearby synapses on the same neuron is likely because of denditric spines.
Explanation:
A dendritic spine (or spine) is a little membranous protrusion from a neuron's dendrite that typically receives input from a single axon at the synapse. Dendritic spines serve as a storeroom for synaptic strength and help transmit electrical signals to the neuron's cell body.