Abstract
Comprehension of past tense marking in Greek developmental dyslexia: language impairment or processing deficit?
Highlights
The present study investigated whether Greek Dyslexic children with impaired phonology manifest additional deficits in morphological processing
Dyslexic children were found to have particular difficulties with non-sigmatic existing verbs, which was followed by overapplication of the aspectual markers in novel verbs which rhymed with the existing non-sigmatic ones
They were proved to use to a less extent sigmatic past tense forms for verbs which rhymed with existing sigmatic ones and novel verbs which do not rhyme with any existing verb
Summary
A group of 10 phonologically impaired dyslexic children (aged 7.6–9) were presented a grammaticality judgment task (The Perfective Past Tense Test, Clahsen and Stavrakaki, 2004) which included both existing and novel verbs (with a total of 50 verbs, divided into different subclasses). The category of existing verbs included verbs with sigmatic past tense forms. Sigmatic Past Tense forms are produced by the adjustment of the aspectual markers to the verb stem and in some cases additional phonological changes, e.g. milo-milisa. Non-sigmatic past tense forms require morphophonological alterations without the aspectual markers (e.g. gherno-eghira). In the case of existing verbs perfective past tense form was taken as correct, whilst in the case of novel verbs the scoring was based on the distinction between sigmatic vs non-sigmatic past tense forms. As far as the generalization properties of sigmatic vs. non-sigmatic past tense forms for each participant group are concerned, non-parametric procedures were administered, such as the Wilcoxon test
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