 Due to limitations of space, we will not discuss psychological and psycholinguistic studies of tense but will focus solely on processing studies of aspect. Moreover, within this topic we limit ourselves to studies of the adult system. The interested reader is referred to Dickey (2001) and the references therein for psycholinguistic work on tense as well as to the entry on  the experience and perception of time   and the contributions in Grondin (2008) for psychology of time in general. 