Number-word reading as challenging task in dyslexia? An ERP study

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Lexical access and early semantic processing are crucial for reading fluency.
• Developmental dyslexia involves persistent difficulties in reading acquisition.
• Compensatory strategies can enable individuals with dyslexia to achieve reading proficiency.

Purpose of the Study:

• To investigate lexical access, selection, and early semantic access in young Hungarian adults.
• To compare reading processes in skilled readers and individuals with successfully compensated developmental dyslexia.
• To explore the neural correlates of reading different word frequencies and types using event-related potentials (ERPs).

Main Methods:

• Utilized the lexical decision paradigm with event-related potentials (ERPs).
• Measured ERPs elicited by words, number-words, and pseudowords.
• Participants judged the meaningfulness of presented letter strings.

Main Results:

• Good readers exhibit enhanced activity in sensory/selection stages for low-sight-frequency words (e.g., number-words).
• Significant processing differences between words and number-words emerge in later processing stages for good readers.
• Compensated dyslexics show distinct patterns in later processing stages, suggesting effective compensatory mechanisms for word recognition.
• Early semantic access is absent for pseudowords in dyslexics, potentially a compensation strategy in transparent orthographies.

Conclusions:

• Young adults can develop specific compensation strategies for reading words of varying frequencies.
• Number-words may not be ideal for assessing general lexical processing, particularly in studies of dyslexia.
• ERP data reveal differences in later processing stages for compensated dyslexics, highlighting their adaptive reading strategies.