MatthewVD writes: "Human-computer interaction expert Clifford Nass says that his research has shown upset drivers don't like interacting with happy automated voices on their GPSs and their cars. Nass, a Stanford professor and the author of The Man Who Lied to His Laptop, says the ideal voice is "subdued, almost a little sad" but robo-voices should mimic the way you speak, so if you call San Francisco, "San Fran" it's a big plus if your car does too."
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