Fokes J, Konefal J
J Commun Disord. 1981 Nov;14(6):497-506. doi: 10.1016/0021-9924(81)90030-7.
The production of agent + action + object + locative relations by 3;6- and 5;6-yr-old normal children and language-disordered children was investigated These utterances were produced after children observed object manipulation or while copying object manipulation. The results indicated a developmental trend in the use of case relations. The manipulation task enhanced the use of case relations by the language-disordered group, whereas the observation task was more effective (or equally effective) for the normal groups.
