Age-of-acquisition ratings on 2816 Dutch four- and five-letter nouns. These norms were collected by asking 559 undergraduates to indicate for a set of words at which age they thought they had learned them. reference_to_cite: "De Moor, W., Ghyselinck, M., & Brysbaert, M. (2000). A validation study of the age-of-acquisition norms collected by Ghyselinck, De Moor, & Brysbaert. Psychologica Belgica" url_information: "Authors' website ( http://expsy.ugent.be/research/Rdocuments/downloads/AoA/AoA.html )" public_note: "A validation study of the age-of-acquisition norms collected by Ghyselinck, De Moor, & Brysbaert (2000). The norms can be downloaded and/or consulted for research purposes, provided that all publications based on research with these norms cite the Ghyselinck, De Moor and Brysbaert study. Note that the norms are for non-profit use only." ...