Perception of pain can be affected by attention

Not only Perception of pain can be affected by expectation, it can also be affected by attention.

One example of this is when we are putting all our attention into a game, and you will feel less pain.

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References

Goldstein, Cognitive Psychology (p. 61).

In another study, it was found that the activity of serious gaming (active distraction) could reduce pain behaviour and subjective distress in children undergoing wound care (Nilsson, Ensnare, Hallquist, & Kokinsky, 2013).