Conventional wisdom has it that working memory is limited to seven units of information , plus or minus two units : " everybody knows that there is a finite span of immediate memory and that for a lot of different kinds of test materials this span is about seven items in length " 通常工作記憶只能儲存有限的7 2個單元的信息: “每個人都知道瞬間記憶的空間是有限的,通過對大量不同類型數(shù)據(jù)的實驗,證明這個空間大概是7個單元。 ”