This experiment demonstrates how different nerve endings respond to different stimuli. By holding an ice cube bowl until the hands are chilled, then trying to touch a bowl of rice grains, the cold-numbed hands will not feel the touch sensation. This shows that nerve impulses from sensations of pain and touch travel to the brain at different speeds, with pain taking longer.

1. 076 RESPONSE OF NERVE IMPULSES
MATERIALS REQUIRED :
Bowl of ice
Bowl of rice grains

2. Hold the ice cubes bowl until the hands get chilled.
ICE CUBES

3. Now when you try to touch the bowl of grains, at once
the hand doesn't tend to touch the bowl with grains.
Bowl with grains

4. Different types of nerve endings respond to
different reactions.
Thus feeling of pain travels through brain
more slowly than feeling of touch.