title: Structural correlates of implicit learning deficits in subjects with developmental dyslexia.
abstract: Several neuroimaging studies in developmental dyslexia (DD) have mainly focused on brain regions subserving phonological processes. However, additional deficits characterize subjects with DD, such as an impairment of visual and rapid stimuli processing and deficits in implicit learning (IL). Little is known about structural abnormalities in brain regions not directly related to phonology and reading processes. The aim of this study was to investigate, using voxel-based morphometry, whether subjects with DD exhibit any structural grey matter (GM) abnormalities in regions that have previously shown abnormal functional magnetic resonance imaging (fMRI) activation during an IL task. Significantly smaller GM volumes were found in the right posterior superior parietal lobule and precuneus and in the right supplementary motor area (SMA) of subjects with DD compared to controls. Moreover, a larger GM volume in parietal cortex was associated with an increase of IL effect in controls but not in subjects with DD. These structural abnormalities are consistent with functional changes and reinforce the hypothesis that an impairment of IL might play a relevant role in learning to read.
authors.affiliation: Child Neuropsychiatry Unit, Department of Neuroscience, IRCCS, Children's Hospital Bambino Gesù, Rome, Italy. menghini@opbg.net
authors.forename: Deny
authors.initials: D
authors.lastname: Menghini
authors.forename: Gisela E
authors.initials: GE
authors.lastname: Hagberg
authors.forename: Laura
authors.initials: L
authors.lastname: Petrosini
authors.forename: Marco
authors.initials: M
authors.lastname: Bozzali
authors.forename: Emiliano
authors.initials: E
authors.lastname: Macaluso
authors.forename: Carlo
authors.initials: C
authors.lastname: Caltagirone
authors.forename: Stefano
authors.initials: S
authors.lastname: Vicari
mesh_terms: D000328:Adult; D004410:Dyslexia / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007858:Learning; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010296:Parietal Lobe / Q000503:physiopathology