http://www.newsweek.com/pet-cat-map-owner-movements-voice-1648319

Pet cats have been found to "mentally map" the whereabouts of their owners when they are out-of-sight, scientists have found. Researchers found that cats track their owners' movements by creating mental representations linked to vocal signals.

The researchers, led by Saho Takagi from the Department of Psychology at Kyoto University, Japan, conducted a series of experiments on cats, using vocal cues from either their owners or strangers.