[citation needed] Agrammatism was first coined by Adolf Kussmaul in 1887 to explain the inability to form words grammatically and to syntactically order them into a sentence.
Later on, Harold Goodglass defined the term as the omission of connective words, auxiliaries and inflectional morphemes, all of these generating a speech production with extremely rudimentary grammar.
Nowadays, the image has slightly changed: grammatical impairment has been found to be selective rather than complete, and a cross-linguistic perspective under the framework of Universal Grammar (UG) together with a shift from morphosyntax to morphosemantics is à la page.
These papers do not describe case reports, they are rather dealing with more general topics such as lesion localization or rehabilitation of agrammatic patients.
Prior to explaining that, to help understand the goals of such research, it is good to give a taste of the shift from morphosyntax to morphosemantics the study of agrammatism is undergoing.
None of the hypotheses on verb forms aforementioned (TPH, TUH, and TAUH) can account for these results, ever since participles in Dutch are not inflected for tense and agreement nor do they check their features in the left periphery.
In any case, the conclusion of Bastiaanse (2008) was that an additional hypothesis expressing that agrammatic speakers have difficulty making reference to the past was needed.