What did the Athenians value the most?

Democracy

Explanation: Athenians want to build a democracy to create well-informed citizens.

The answer is concept.  Halle Berry Neuron is best described as responding to the concept of Ms. Berry.

Halle Berry Cells are located in the anterior hippocampus. They are involved in forming long-term and abstract memories.  They become active and respond selectively to visual stimuli that presents images of well-known celebrities, landmarks, or other categories of objects. They encode not the visual features of the images, but the abstract concept of it. Just like the concept of the actress Halle Berry. When one is shown a photograph of the actress dressed as Catwoman, or just by showing her name, the Halle Berry cells will respond to the visual stimuli.