Validating a Neurocognitive Remediation Model for Visual-Attentional Pathway in Chinese Developmental Dyslexia

Summary

Developmental dyslexia is a common and serious specific learning disability affecting up to one in eight children in Hong Kong, with profound consequences for academic success and personal well-being. For children learning to read the visually complex Chinese script, the challenge is particularly intense. A key research challenge is a long-standing "chicken-and-egg" debate: are weaknesses in the brain's fast-processing visual system (Magnocellular-Dorsal deficits) a cause of reading difficulties, or merely a consequence of limited reading practice? This uncertainty has constrained theoretical progress, creating a major barrier to developing effective, evidence-based support for struggling readers beyond traditional linguistic-based methods.

This project is designed to resolve this debate by directly testing if training a core visual-attentional skill can causally improve reading. The approach is built on investigator's strong pilot data, which established a novel "Neurocognitive Cascade Model": a framework suggesting that the integrity of foundational visual processing impacts reading through a sequential chain reaction flowing from visual attention to working memory.

To test the model, investigators will employ a rigorous, assessor-blind randomized controlled trial with 100 Cantonese-speaking children with developmental dyslexia. Participants will be randomly assigned to either an intervention group that plays action video games, scientifically proven to enhance visual attention, or an active control group that plays a different type of non-action, engaging game. This design allows investigators to isolate the specific impact of the visual-attentional training. The investigators will track changes at four time points-before, during, immediately after the intervention, and at a 6-month follow-up-using a multi-level assessment battery, including objective neural signals of visual processing, cognitive skills, and real-world reading performance measured with advanced eye-tracking technology.

This research will deliver new knowledge that is both scientifically and socially impactful. It will provide the first causal evidence for a visual-attentional pathway to reading remediation in Chinese developmental dyslexia, fundamentally shifting theoretical understanding of the disorder from a single, phonological deficit to a more comprehensive, multi-component model. The findings will have a significant translational impact, paving the way for innovative, non-reading-based interventions and new early screening tools. Ultimately, this project will offer a new, evidence-based approach to help children overcome the specific neurocognitive bottlenecks that hinder their ability to learn to read, with the potential to improve educational outcomes for a large and underserved population.

Conditions

• Dyslexia

Interventions

BEHAVIORAL

Action video game intervention group

Participants will undergo 12 hours of training with a commercially available AVG (Rabbids: Party of Legends). This game is a direct successor to the Rayman Raving Rabbids game used in AVG intervention studies and shares its core mechanics. The game consists of numerous fast-paced mini-games in which players track multiple objects, respond to unpredictable events, and filter out distractions, thereby placing high demands on visual-spatial attention and attentional control.

BEHAVIORAL

Active Control (Non-Action Video Game) Group

Participants will undergo 12 hours of training with SimCity. To control for non-specific effects (e.g., gaming time, engagement, motivation), this group will play a non-action video game of matched duration and format. The investigators will use a commercially available city-building and management simulation game (e.g., SimCity), which is engaging and cognitively demanding (requiring planning and resource management). However, it critically lacks the fast, unpredictable, and attention-intensive elements of action games, ensuring that any observed group differences can be attributed specifically to the visual-attentional training provided by the AVG.

Sponsors & Collaborators

• The Hong Kong Polytechnic University

  lead OTHER

Study Design

Allocation

RANDOMIZED

Purpose

HEALTH_SERVICES_RESEARCH

Masking

TRIPLE

Model

FACTORIAL

Eligibility

Min Age

7 Years

Max Age

10 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2026-01-01

Primary Completion

2028-12-31

Completion

2029-12-31

Countries

• Hong Kong

Study Locations