School of Psychology - Activities - Demonstrations - Fog Slow Down

Demonstration - Fog Slow Down

Does the scene with the fog or the scene without the fog look slower?

Both scenes show the vehicle travelling at 60 kph but the scene with the fog effect looks slower because of a visual illusion. These scenes were part of an experiment, published in the journal Perception, in which we wanted to see what the effect of reducing image contrast was on speed judgements. We found that adding the fog effect (effectively reducing the contrast of the image) made the vehicle’s speed look about 5 kph slower and also made it harder for people to tell apart different speeds. This finding could have implications for the crash risk of people driving in low contrast conditions, such as in fog, with dirty or tinted windows, or when the driver has cataracts.

Accessed: 4464 times
Created: Wednesday, 9th December 2009 by paulj
Modified: Friday, 8th July 2011 by paulj
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