supporters of extended cognition have used clark's comparison between inga and otto as a champion analogy to support the theory of the internal mind extending into the environment. in an article on the argument of extended cognition, erik myin makes note of this group, "a close causal coupling between persons and environments," such as otto and his notebook, "can license the conclusion that the mind spreads into the environment." his also writes that some followers use clark's argument of, "external elements" playing a role that could be seen as, "cognitive if played by something internal to a person." a good reference to this would be how otto's notebook is used for cognitive verification.