 (1) Many philosophers hold an externalist view of intentionality, according to which intentionality requires representation, and representation depends on circumstances external to the body of the representing subject. (To illustrate with Putnam’s (1975) famous example from Twin Earth, what a thought that \(S\) might express by “This is water” is actually about depends on what the transparent, tasteless liquid in \(S\)’s environment actually is.) It seems, however, that the causal determinants of \(S\)’s behavior can depend only on events occurring inside \(S\)’s body. Thus, if externalism is right, what \(S\) does cannot depend on the intentional content of \(S\)’s thoughts.