Alexandra Horowitz, a research scientist in the field of dog cognition believes that dogs are able to use their keen sense of smell to determine what time of day it is. Smells in a room change as the day goes on. Hot air rises, and it usually rises in currents along the walls and will rise to the ceiling and go kind of to the center of the room and drop. If we were able to visualize the movement of air through the day, what we're really visualizing is the movement of odor through the day.
Listing some reference articles by vets from Australia, UK and USA regarding slow feed bowls, and their benefits in preventing obesity, bloat, vomiting and other gastrointestinal disorders in cats and dogs. The conclusion drawn is that the slow feeder bowl is effective in slowing down the rate of eating of your pet. While doing so it can also provide some mental stimulation during meal times.