ABSTRACT
Of the many possible ways of classifying memory, this chapter uses only one; the effects on memory of interference from other events that happen to the person. We can find types of memory that are impaired by event A but not by B, whereas a different class of memories may show impairment by B but not by A. Consequently, there must be something different about the changes in the nervous system that hold the representations of each type. The two types need not, of course, be physically distinct, in location in the brain or in the type of physiological coding used. They are, however, computationally distinct; they do different things. As we shall see, a classification based on this approach may well parallel classifications of other types, and does not exclude them.
