variation in experimental scores among identically treated individuals within the same group who experienced the same experimental conditions. It is determined through an analysis of variance and compared with the between-groups variance to obtain an F ratio. Also called within-subjects variance.
any method used to assess memory for information following its initial presentation or acquisition. Several broad categories of such measures exist, including free recall, serial recall, recognition method, and savings method. Retention measures may be immediate (given right after the learning session) or delayed (given some hours, days, weeks, or other time period after the learning session), and they may be for implicit memory as well as explicit memory.