What makes memory in the human brain an emergent property?

In the context of systems biology, memory in the human brain is considered an emergent property because it cannot be explained by the function of a single neuron or even a small group of neurons viewed in isolation.1

Instead, memory arises from the collective behavior and interactions of a large number of neurons acting together. This aligns with the fundamental principle of systems biology that biological systems possess "emergent properties"—critical attributes that result from the collective interactions of many molecular or cellular parts, which cannot be predicted or understood by studying those individual components alone.1

While specific brain regions like the hippocampus are known to be essential for memory formation and storage, the phenomenon of remembering is a complex, distributed process. It relies on the integration of information across vast neural networks, where the strength and efficacy of synaptic connections are altered through experience, allowing the system to encode, store, and retrieve past information.2345