Verb reading in developmental language impairment

This research addresses the issues of frequency and regularity in verb reading and their importance for the organization of the mental lexicon in DLI francophones. A reading task probes response latencies and response accuracy for DLI and control participants on frequent and infrequent inflected forms of verbs. DLI participants are slower at reading verbs even if their mean accuracy rates are higher than controls'. Results also indicate that the type of suffix on the verb affects controls and DLI participants differently in their accuracy rates: DLI participants exhibit higher error rates on less frequent inflections, while controls do not. Finally, unusual patterns are found for DLI participants on regular versus irregular verbs: regular verbs are slower to be read by DLI participants. These results are compared to findings from a previous simple lexical decision study. They are interpreted as indicating that DLI word reading patterns are qualitatively different from those evidenced by controls. (C) 2003 Elsevier Science (USA). All rights reserved.