ABSTRACT
Any theory of language processing must eventually confront the acquisition of the processes involved in this skill. It is surprising how little research on speech perception across development has been carried out relative to the large number of studies of infants and young adults. Lifespan studies are central to evaluating theories of the processes responsible for observed differences and similarities in language processing with age. The experiments discussed in this chapter were designed to assess the evaluation and integration of audible and visible speech across a broad range of ages. The question of interest is whether the differences and similarities could be accounted for in a reasonable way within the framework of this investigation.
