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Inhibitory control during sentence reading in dyslexic children
Menno van der Schoot1, Robert Licht, Tako M Horsley
1Department of Special Education, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081 BT Amsterdam, The Netherlands. M.van.der.Schoot@psy.vu.nl
Summary
Children with the guessing subtype of dyslexia exhibit reading difficulties due to an inefficient suppression mechanism. This leads to impulsive reading rather than over-reliance on contextual cues.
Area of Science:
- Cognitive Neuroscience
- Developmental Psychology
- Educational Psychology
Background:
- Dyslexia is a common reading disability.
- The guessing subtype of dyslexia is characterized by fast but inaccurate reading.
- Existing theories propose either oversensitivity to semantic context or premature lexical activation as causes.
Purpose of the Study:
- To differentiate between excitatory and inhibitory accounts of reading disturbance in guessing dyslexic readers.
- To investigate the underlying mechanisms of the "guessing" subtype of dyslexia.
Main Methods:
- A sentential priming task (SPT) was employed with dyslexic children (guessers) and normal readers.
- Participants judged semantic congruence of sentence-final words, inhibiting responses to pseudowords.
- Pseudowords were designed to elicit guessing by closely resembling valid words.
Main Results:
- Guessers showed significantly higher false recognition rates (FRR) for pseudowords.
- Analysis indicated greater difficulty for guessers in suppressing the 'go tendency' triggered by pseudowords.
- This suggests an impaired ability to inhibit premature responses.
Conclusions:
- The impulsive reading style in guessers stems from a less efficient suppression mechanism.
- Dyslexic guessers struggle to inhibit responses until stimulus analysis is complete.
- Reading inaccuracy is attributed to faulty response inhibition, not context over-reliance.