This document discusses the role of neurons in memory formation based on the work of Eric Kandel. It summarizes that Kandel found any experience resulting in memory produces physical changes in the brain at the neuronal level, including changes in neuronal structure and function. It describes how Kandel studied memory and learning in Aplysia, observing changes at synapses in the form of increased neurotransmitter release, more receptor sites, and growth of new synapses, known collectively as long-term potentiation. These synaptic changes are what enable memories to form at the neuronal level.