Re:Define:tool (Score 1)

Without having read the article about how they actually performed the experiment, yes, your computer is an extension of your body. For an astoundingly clear analysis read "Understanding Media: The Extensions of Man" by McLuhan. You never knew light bulbs were so interesting. You're getting hung up on what cognitive scientists called intentionality -- see Brentano's intentionality. A typewriter is only an extension of your self because you imbue it with intentionality, a monkey can't do that because a monkey doesn't understand type, or written language like you or I do. In the primate's defense, I'm sure that teaching a monkey to type would follow shortly after teaching it to read and spell.