Administration of the test takes between 5 and 10 minutes and examines functions including registration (repeating named prompts), attention and calculation, recall, language, ability to follow simple commands and orientation. It was originally introduced by Folstein "et al." in 1975, in order to differentiate organic from functional psychiatric patients but is very similar to, or even directly incorporates, tests which were in use previous to its publication. This test is not a mental status examination. The standard MMSE form which is currently published by Psychological Assessment Resources is based on its original 1975 conceptualization, with minor subsequent modifications by the authors.