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I thought this was an interesting article. There's a whole 'science' devoted to this sort of thing, from the way supermarkets are set up, to the way companies advertise food subliminally.
Have you ever noticed that the voice-over on a fast food commercial is usually a guy, and that guy usually has a pretty deep voice? Advertisers have long known that humans have rather predictable associations when it comes to sounds, and a new study by researchers at the Georgia Institute of Technology and Vanderbilt University just provided some very concrete evidence to support of one those suspected mental connections: deep voices and low-pitched sounds force your brain to think something is big.
I always thought it was because the deep voice sounds it belongs to a very big hefty guy, and if he's approving it, it'll be more than filling enough for the average person.