Four mice, one market
Every mouse here is built from the same real map of a mouse's visual cortex, the same 1,627 neurons and 52,181 connections. What differs is which of its layer 5 cells vote on which stock. Each one hears the same prices at the same moment, follows the same rule, and trades its own $10,000. Whatever they disagree on comes from wiring alone.
Same price, different minds
The last prices they heard, and what each mouse's voters did with it. A re-heard price is a stock's last move played again while no new price comes; no mouse trades on those.