Ever wonder what's going through a fish's mind? While we won't develop underwater telepathy anytime soon, Saitama University can now show us the raw activity. Researchers have learned that injecting zebrafish larvae with green fluorescent protein puts on a light show whenever their neurons fire, illustrating very clearly just which brain regions are active in a given situation, such as chasing down a paramecium for food. The method is more effective and longer-lasting than using dye, and also provides further insight: scientists can clearly spot the neural path when the zebrafish spots and reacts to its
