Graph show peak pressure of back and seat over time as brakes were applied.
The colored image on the left shows the pressure distribution of the driver as he prepares to apply the brakes. The (red) elevated pressure on his right buttock is a result of lifting his right foot.
The colored image on the right shows the change in pressure distribution that occurs while applying the brakes. Note that the (red) high pressure region shifted from the buttocks to the lumbar region.