Naina B. answered 07/04/15
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Response of an animal to touch or tactile sensation is known as mechanoreception where touch, a mechanical stimulation activates the touch receptors provided the touch is in the area rich in tactile receptors. For instance, if we touch the body of horse tail then it would get sensation since skin of the tail is rich in tactile receptors that carry the stimulation to brain through neurons that transmit the stimulation as electrical current. The brain would respond (feedback response as Michael writes) through neurons telling the horse to remove that touch sensation by moving the tail and in fact, using the tail to remove that sensation. However, if we touch the hairs on tail tip then horse may not respond since hairs may not be that rich in tactile receptors. However, if we pull those hair then it would be touch and pain/discomfort stimulation and the animal would respond to that combined stimulation (touch and discomfort) though neurons in the similar manner trying to remove uncomfortable stimulation.
Hope this helps.