The cause of Sense, is the External Body, or Object, which presseth the organ proper to each Sense, either immediately, as in theTaste and Touch; or mediately, as in Seeing, Hearing, and Smelling: which pressure, by the mediation of Nerves, and other strings, and membranes of the body, continued inwards to the Brain, and Heart, causeth there a resistance, or counter- pressure, or endeavor of the heart, to deliver it self: which endeavor because Outward, seemeth to be some matter without.
Thomas Hobbes (2008). “Leviathan”, p.21, Simon and Schuster