AI Article Synopsis
- Limited research on the pars triangularis (PT) in dyslexia and ADHD highlights its potential role in phonological processing and attention issues.
- A study with 50 children found no significant differences in PT structure between dyslexia and non-dyslexia groups, but ADHD participants showed smaller PT lengths.
- The presence of extra sulcus in the left PT linked to poor expressive language abilities, while left and right PT lengths related differently to phonological skills and semantic processing, indicating the need for further investigation.
Article Abstract
Limited research has been conducted on the structure of the pars triangularis (PT) in dyslexia despite functional neuroimaging research finding it may play a role in phonological processing. Furthermore, research to date has not examined PT size in ADHD even though the right inferior frontal region has been implicated in the disorder. Hence, one of the purposes of this study was to examine the structure of the PT in dyslexia and ADHD. The other purposes included examining the PT in relation to overall expressive language ability and in relation to several specific linguistic functions given language functioning often is affected in both dyslexia and ADHD. Participants included 50 children: 10 with dyslexia, 15 with comorbid dyslexia/ADHD, 15 with ADHD, and 10 controls. Using a 2 (dyslexia or not) x 2 (ADHD or not) MANCOVA, findings revealed PT length and shape were comparable between those with and without dyslexia. However, children with ADHD had smaller right PT lengths than those without ADHD, and right anterior ascending ramus length was related to attention problems in the total sample. In terms of linguistic functioning, presence of an extra sulcus in the left PT was related to poor expressive language ability. In those with adequate expressive language functioning, left PT length was related to phonological awareness, phonological short-term memory and rapid automatic naming (RAN). Right PT length was related to RAN and semantic processing. Further work on PT morphology in relation to ADHD and linguistic functioning is warranted.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2759398 | PMC |
| http://dx.doi.org/10.1016/j.bandl.2009.03.001 | DOI Listing |
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