  From theoretical linguistic and cognitive perspectives, situated dialog
systems are interesting as they provide ideal test-beds for investigating the
interaction between language and perception. At the same time there are a
growing number of practical applications, for example robotic systems and
driver-less cars, where spoken interfaces, capable of situated dialog, promise
many advantages. To date, however much of the work on situated dialog has
focused resolving anaphoric or exophoric references. This paper, by contrast,
opens up the question of how perceptual memory and linguistic references
interact, and the challenges that this poses to computational models of
perceptually grounded dialog.
