In 1893 Emil Kraepelin borrowed the term from Schule and Pick and in 1899 introduced a broad new distinction in the classification of mental disorders between `` dementia praecox '' and mood disorder ( termed manic depression and including both unipolar and bipolar depression ) .
In 1893 Emil Kraepelin introduced a new distinction in the classification of mental disorders between `` dementia praecox '' and mood disorder ( termed manic depression and including both unipolar and bipolar depression ) .