What is pressure sensitive?

Famous quotes containing the words pressure and/or sensitive:

    Osteopath—One who argues that all human ills are caused by the pressure of hard bone upon soft tissue. The proof of his theory is to be found in the heads of those who believe it.
    —H.L. (Henry Lewis)

    Peasants are a rude lot, and hard: life has hardened their hearts, but they are thick and awkward only in appearance; you have to know them. No one is more sensitive to what gives man the right to call himself a man: good-heartedness, bravery and virile brotherhood.
    Jacques Roumain (1907–1945)