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. 2013 Aug;51(9):1684-92.
doi: 10.1016/j.neuropsychologia.2013.05.012. Epub 2013 May 22.

Planum temporale morphology in children with developmental dyslexia

Juliana Sanchez Bloom  1 , Mauricio A Garcia-Barrera, Carlin J Miller, Scott R Miller, George W Hynd
Affiliations

Planum temporale morphology in children with developmental dyslexia

Juliana Sanchez Bloom et al. Neuropsychologia. 2013 Aug.

Abstract

The planum temporale is a highly lateralized cortical region, located within Wernicke's area, which is thought to be involved in auditory processing, phonological processing, and language. Research has linked abnormal morphology of the planum temporale to developmental dyslexia, although results have varied in large part due to methodological inconsistencies in the literature. This study examined the asymmetry of the planum temporale in 29 children who met criteria for dyslexia and 26 children whose reading was unimpaired. Leftward asymmetry of the planum temporale was found in the total sample and this leftward asymmetry was significantly reduced in children with dyslexia. This reduced leftward asymmetry in children with dyslexia was due to a planum temporale that is larger in the right hemisphere. This study lends support to the idea that planum temporale asymmetry is altered in children with developmental dyslexia.

Keywords: Auditory processing; Laterality; MRI; Neurobiology; Phonological processing; Planum temporale; Reading; Reading disability.

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Figures

Figure 1
Figure 1
An axial view of the planum temporal (the larger, triangular structure) and Heschl’s gyrus of a normal adult. In this picture, the anterior of the brain is at the top and right and left are reversed. Thus, the fact that the left PT is larger is visible. Adapted from Hirayasu et al. (2000, p. 696).
See this image and copyright information in PMC

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