Back to Search
Start Over
Are the literacy difficulties that characterize developmental dyslexia associated with a failure to integrate letters and speech sounds?
- Source :
- Developmental Science
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- The ‘automatic letter‐sound integration hypothesis’ (Blomert, 2011) proposes that dyslexia results from a failure to fully integrate letters and speech sounds into automated audio‐visual objects. We tested this hypothesis in a sample of English‐speaking children with dyslexic difficulties (N = 13) and samples of chronological‐age‐matched (CA; N = 17) and reading‐age‐matched controls (RA; N = 17) aged 7–13 years. Each child took part in two priming experiments in which speech sounds were preceded by congruent visual letters (congruent condition) or Greek letters (baseline). In a behavioural experiment, responses to speech sounds in the two conditions were compared using reaction times. These data revealed faster reaction times in the congruent condition in all three groups. In a second electrophysiological experiment, responses to speech sounds in the two conditions were compared using event‐related potentials (ERPs). These data revealed a significant effect of congruency on (1) the P1 ERP over left frontal electrodes in the CA group and over fronto‐central electrodes in the dyslexic group and (2) the P2 ERP in the dyslexic and RA control groups. These findings suggest that our sample of English‐speaking children with dyslexic difficulties demonstrate a degree of letter‐sound integration that is appropriate for their reading level, which challenges the letter‐sound integration hypothesis.
- Subjects :
- Paper
Adolescent
Cognitive Neuroscience
media_common.quotation_subject
Speech sounds
050105 experimental psychology
Literacy
letter-sound integration
Dyslexia
03 medical and health sciences
0302 clinical medicine
Reaction Time
Developmental and Educational Psychology
medicine
Humans
0501 psychology and cognitive sciences
Child
Evoked Potentials
Statistical hypothesis testing
media_common
Intelligence quotient
05 social sciences
medicine.disease
Language acquisition
Acoustic Stimulation
Case-Control Studies
Papers
Speech Perception
Task analysis
Psychology
Priming (psychology)
030217 neurology & neurosurgery
Cognitive psychology
Subjects
Details
- ISSN :
- 1363755X
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Developmental Science
- Accession number :
- edsair.doi.dedup.....ed82a088de98681ea536fecce5a4e134