And another question we're interested in is whether the animal actually has a mental picture of another dolphin when it hears a dolphin's signature whistle.

NPR: Study: Dolphins Call Out Their Own Names

The best controllers, they say, maintain a constantly moving mental picture of all their air traffic -- what they call situation awareness.

CNN: Can technology fix the FAA's air traffic troubles?

The old mental picture of a nomad invariably had him mostly him, at that time lugging lots of them.

ECONOMIST: Nomads at last

If Holmes was on medication, that may have made him appear more drowsy, making it more difficult to get a complete picture of his mental state, she said.

CNN: STORY HIGHLIGHTS

When he and his colleagues taught children a simple set of mental tricks such as pretending that the candy is only a picture, surrounded by an imaginary frame he dramatically improved their self-control.

NEWYORKER: Don��t!