The effect of syntax on reading in neglect dyslexia

Area of Science:

• Neuroscience
• Linguistics
• Cognitive Psychology

Background:

• Text-based neglect dyslexia involves omitting words on the neglected side, typically the left.
• The influence of sentence syntax on reading in this condition is not fully understood.

Purpose of the Study:

• To investigate if syntactic structure affects word omissions in Hebrew-speaking individuals with left text-based neglect dyslexia.
• To determine if the obligatoriness of sentence constituents influences reading behavior.

Main Methods:

• Seven Hebrew-speaking individuals with acquired left text-based neglect dyslexia participated.
• Participants read 310 sentences comparing minimal pairs differing in the obligatoriness of the final (leftmost) constituent.
• Conditions included complement vs. adjunct, obligatory vs. optional pronouns, verb tense effects, and clause types.

Main Results:

• Syntactic knowledge modulated sentence reading in individuals with neglect dyslexia.
• Word omissions increased when the final constituent was optional compared to obligatory.
• Reading behavior was guided by the need to satisfy syntactic and semantic requirements, seeking a 'happy end'.
• A dissociation was observed between text-level and word-level neglect dyslexia.

Conclusions:

• The syntactic structure of sentences significantly impacts reading and neglect errors in text-based neglect dyslexia.
• Sentences with optional, syntactically non-essential leftmost constituents are optimal for diagnosing mild cases.
• Findings suggest distinct mechanisms for text-level and word-level neglect dyslexia.