The reception density will be different for each body part because it is most likely for our fingertips’ receptors to be more heightened than the back of our neck because we use our fingertips to sense objects surrounding us often. Since we were toddlers, the majority of our discoveries were through our sense of touch. A possible reason our hands, in general, to be more sensitive than the rest of our body can be traced back to Cenozoic Era, when the first sight of the human species was discovered. For example, humans in that era learned how to survive by touching fire. If they did not touch fire, they would not have known that fire is hot, and survived the ice age by warming themselves with fire.
