Sensation And Perception Brain Teaser

After a musical concert that you enjoyed without distraction, a companion complains that she heard little of the music due to frequent shuffling and throat-clearing in the audience. The difference in your experience and hers is related to

If you are a gymnast, dancer, or athlete your _____ must be very in tune.

This was seen in a scene where person A was getting directions from a bystander, then was interrupted by construction workers, then was replaced with person B. The bystander doesn’t notice the switch from person A to person B 40% of the time. What phenomenon does this represent?

The spinal cord has small nerve fibers that conduct pain and large nerve fibers that conduct everything else. When you’re hurt, the small fibers are activated and you feel PAIN! Then the large fibers block the sensation to the brain and you feel no pain. This theory is supported by things like massage and acupuncture that stimulate other areas (the large fibers) and thus cut down on pain. What is it?