Deficits in perceptual noise exclusion in developmental dyslexia.
We evaluated signal-noise discrimination in children with and without dyslexia, using magnocellular and parvocellular visual stimuli presented either with or without high noise. Dyslexic children had elevated contrast thresholds when stimuli of either type were presented in high noise, but performed as well as non-dyslexic children when either type was displayed without noise. Our findings suggest that deficits in noise exclusion, not magnocellular processing, contribute to the etiology of dyslexia.
Sperling
Anne J
AJ
Georgetown University Medical Center, 4000 Reservoir Road NW, Building D, Room 207E, Washington, DC 20057, USA. ajs76@georgetown.edu
Lu
Zhong-Lin
ZL
Manis
Franklin R
FR
Seidenberg
Mark S
MS
D016477:Artifacts; D001288:Attention; D016022:Case-Control Studies; D002648:Child; D015350:Contrast Sensitivity; D004192:Discrimination, Psychological; D004410:Dyslexia / Q000523:psychology*; D006801:Humans; D012684:Sensory Thresholds; D014796:Visual Perception