"Electric cars are great for the environment, but they come with a problem - they're too quiet, and this makes them dangerous to pedestrians used to the loud noises of the internal combustion engine. One idea is to add noise to the cars, and Mark Changizi recently wondered whether perceptual psychologists could help design a better sound, using an illusion. I don't think it would work, and the reason is a nice example of why it's important to understand the relationship between the world and perceptual information about the world."
[A follow up to a previous post about adding the illusion of sound to the almost silent electric car. This excellent post describes in some detail why it won't work. - GC]