Benefits from morphological regularities in dyslexia are task dependent.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Developmental Psychology

Background:

• Individuals with dyslexia (IDDs) often face challenges with short-term memory and phonological decoding.
• It remains unclear whether IDDs compensate for these deficits by leveraging linguistic regularities or if their benefit from these regularities is inherently reduced.

Purpose of the Study:

• To investigate how individuals with dyslexia (IDDs) utilize linguistic regularities in tasks like vocabulary acquisition and reading.
• To determine if IDDs benefit less from linguistic regularities compared to typical readers, despite potential compensatory strategies.

Main Methods:

• Two experiments were conducted using novel Hebrew words presented with or without familiar morphological structure.
• Experiment 1 involved auditory vocabulary acquisition, assessing recall and recognition.
• Experiment 2 focused on reading novel words, evaluating benefits from structure familiarity under different task demands (accuracy vs. speed).

Main Results:

• Participants with dyslexia showed a smaller recall benefit from morphological structure in vocabulary acquisition compared to controls.
• While recognition was facilitated by structure in IDDs, the benefit was not significantly different from controls.
• In reading, IDDs exhibited a significantly smaller benefit from structure familiarity, especially when accuracy was prioritized.
• However, when speed was emphasized, structure familiarity became beneficial for IDDs without impacting accuracy.

Conclusions:

• The accumulative acquisition of sublexical regularities appears less efficient in dyslexia.
• Despite less efficient acquisition, knowledge of linguistic regularities is accessible and can be beneficial for individuals with dyslexia in specific contexts, particularly for reading speed.