Each point on and inside the body is represented by a point on the surface of the brain. Any two points or more in simultaneous action can combine in the brain and augment or neutralise one another. So your pain, pin prick, from the thumb, can be neutralised by tickling the index finger or other parts of the body or looking at a good picture or hearing good music can neutralise or modify it.
Similarly, somebody scolding you at about the time of the pin prick may magnify the effects of the pin prick.
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