Putting properties of objects in context: reply to Nickerson.

Nickerson argued that "the properties of both the immediate stimulus and the set of possibilities are important determinants of performance," as if these are separate and independent things. However, there cannot be relations that are separate from the properties that compose them. My studies demonstrate that similarity relations are important to performance. The question here is whether properties of the presented stimulus, independent of these relations, are also important to performance. There currently seems to be no evidence that they are.