Abstract

The paper discusses the criticism of externalist theories of content which, on the basis of "Twin Earth" considerations, claims that such theories cannot make intentional properties supervenient on basic, intrinsic properties of the organism -- while supervenience is a necessary condition for the causal efficacy of any macro-property. The paper accepts the supervenience requirement, understood as arising from a requirement that macro- properties should be explained by micro- properties. It points out, however, that as a consequence of this, the modality in the concept of supervenience should be understood as "nomic", not conceptual. Then the paper attempts to show that the usual thought- experiments do not establish that such variety of supervenience does not hold for psychological properties -- at least with regard to a particular, teleo- functional way of interpreting them.