Touch -- Zoha

Everything humans do involves using one or more senses. It is through the senses that infants discover the world. Humans experience these sensations through interactions with the environment; interpreting the meaning of these sensations for actions is called sensory processing.

Touch is our oldest, most primitive and pervasive sense. It's the first sense we experience in the womb and the last one we lose before death Not only does the skin have a main job of protecting the young infant, but it also exposes the infant to the sense of touch. It lets your infant feel it's way around and feel the differences between a soft blanket and a hard wood floor.

Touch may be considered one of five human senses; however, when a person touches something or somebody this gives rise to various feelings: the perception of pressure (hence shape, softness, texture, vibration, etc.), relative temperature and sometimes pain. Thus the term "touch" is actually the combined term for several senses. In medicine, the colloquial term "touch" is usually replaced with somatic senses, to better reflect the variety of mechanisms involved.

http://social.jrank.org/pages/557/Sensory-Development-Touch.html
http://en.wikipedia.org/wiki/Somatosensory_system