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

ECONOMIST: Nomads at last

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?

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

Evelyn Bromet, professor of psychiatry at SUNY Stony Brook, says the study's real value may be in the picture of mental health that emerges over time.

NPR: Mental Issues Surge, Suicide Rates Flat Post-Katrina

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 faced with an incomplete picture, the brain works to complete the mental image by inferring the missing information.

FORBES: Are You Making the Right Connections?

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!