Multisensory spatial attention deficits are predictive of phonological decoding skills in developmental dyslexia.
Although the dominant approach posits that developmental dyslexia arises from deficits in systems that are exclusively linguistic in nature (i.e., phonological deficit theory), dyslexics show a variety of lower level deficits in sensory and attentional processing. Although their link to the reading disorder remains contentious, recent empirical and computational studies suggest that spatial attention plays an important role in phonological decoding. The present behavioral study investigated exogenous spatial attention in dyslexic children and matched controls by measuring RTs to visual and auditory stimuli in cued-detection tasks. Dyslexics with poor nonword decoding accuracy showed a slower time course of visual and auditory (multisensory) spatial attention compared with both chronological age and reading level controls as well as compared with dyslexics with slow but accurate nonword decoding. Individual differences in the time course of multisensory spatial attention accounted for 31% of unique variance in the nonword reading performance of the entire dyslexic sample after controlling for age, IQ, and phonological skills. The present study suggests that multisensory "sluggish attention shifting"-related to a temporoparietal dysfunction-selectively impairs the sublexical mechanisms that are critical for reading development. These findings may offer a new approach for early identification and remediation of developmental dyslexia.
Dipartimento di Psicologia Generale, Università di Padova, Italy. andreafacoetti@unipd.it
Andrea
A
Facoetti
Anna Noemi
AN
Trussardi
Milena
M
Ruffino
Maria Luisa
ML
Lorusso
Carmen
C
Cattaneo
Raffaella
R
Galli
Massimo
M
Molteni
Marco
M
Zorzi
D000161:Acoustic Stimulation / Q000379:methods; D000293:Adolescent; D001288:Attention / Q000502:physiology*; D001289:Attention Deficit Disorder with Hyperactivity / Q000209:etiology*; D002648:Child; D004410:Dyslexia / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D008606:Mental Processes / Q000502:physiology*; D009483:Neuropsychological Tests; D010700:Phonetics; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D012044:Regression Analysis; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors