Redheads are often thought to be quick-tempered and able to handle more pain than others. While there isn't scientific proof of the quick temper, recent research suggests there might be some truth to their higher pain tolerance. Scientists at Massachusetts General Hospital (MGH) have discovered why people with red hair
There’s an important distinction to be made between pain threshold (when a sensation is recognised as painful) and pain tolerance.
Were the dentists trying to find out how much was needed for the subject to notice the painful stimulus, or for them to no longer be able to tolerate it?