What you need:
A partner
What to do:
1. Stand facing your partner.
2. Place your left hand against your partner’s right hand so that your fingers line up. The palms need to touch as well.
3. Use the thumb and index finger of your free hand to simultaneously stroke the index finger on your hand and the index finger on your partners hand.
4. Swap roles to compare notes.
What happens:
Slowly, you start to feel that your index finger resting against your partners has gone numb.
Why?
Sometimes the brain skips certain sensory information. This is known as perceptual disjunction which simply means incomplete or inconsistent perception. In this case, the brain forgets that you are not touching both sides of your index finger because your partners finger is in the way. While stroking only one side of the index finger, it concludes that the other side has gone numb.
Picture Credit : Google
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