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Sluggish dorsally-driven inhibition of return during orthographic processing in adults with dyslexia
- Publication Year :
- 2018
-
Abstract
- Dyslexia (D) is a neurodevelopmental reading disorder characterized by phonological and orthographic deficits. Before phonological decoding, reading requires a specialized orthographic system for parallel letter processing that assigns letter identities to different spatial locations. The magnocellular-dorsal (MD) stream rapidly process the spatial location of visual stimuli controlling visuo-spatial attention. To investigate the visuo-spatial attention efficiency during orthographic processing, inhibition of return (IOR) was measured in adults with and without D in a lexical decision task. IOR is the delay in responding to stimuli displayed in a cued location after a long cue-target interval. Only adults with D did not showed IOR effect during letter-string recognition, despite the typical left-hemisphere specialization for word identification. A specific deficit in coherent-dot-motion perception confirmed an MD-stream disorder in adults with D. Our results suggest that adults with D might develop an efficient visual word form area, but a dorsal-attentional dysfunction impairs their reading fluency.
- Subjects :
- Adult
Male
Settore M-PSI/01 - Psicologia Generale
Linguistics and Language
Visual perception
genetic structures
media_common.quotation_subject
Cognitive Neuroscience
Motion Perception
Experimental and Cognitive Psychology
050105 experimental psychology
Language and Linguistics
Inhibition of return
Dyslexia
03 medical and health sciences
Speech and Hearing
Fluency
Young Adult
0302 clinical medicine
Dorsal visual pathway
Inhibitory attentional mechanism
Learning disabilities
Reading disorder
Visual processing deficit
Attention
Female
Humans
Visual Perception
Reading
Reading (process)
Lexical decision task
medicine
0501 psychology and cognitive sciences
Visual word form area
media_common
Cued speech
05 social sciences
medicine.disease
Psychology
030217 neurology & neurosurgery
Cognitive psychology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c1b45c451163fc41ebba1284bc2142c1