Abstract
Abstract In this chapter we begin by defining a category of tasks usually referred to as delayed-response tasks. In particular, we describe the classic direct method delayed-response (DR) task, and the spatial delayed alternation (DA) task. Next, we briefly outline the neuroanatomic systems important for performing DR and DA tasks, and we review results of DR and DA testing in several human populations with neurologic dysfunction. One of our goals is to contribute toward an understanding of two basic issues: (1) The extent to which prefrontal cortex may be involved in DR and DA performance in humans, and (2) the nature of the neuropsychologic functions necessary for the successful performance of DR and DA tasks by humans.
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