 Also, William of Ockham's "Summa Logicae" brought forward one of the first serious proposals for codifying a mental language.The scholastics of the high medieval period, such as Ockham and John Duns Scotus, considered logic to be a "scientia sermocinalis" (science of language).The result of their studies was the elaboration of linguistic-philosophical notions whose complexity and subtlety has only recently come to be appreciated.