Attentional abilities constrain language development: A cross-syndrome infant/toddler study

Area of Science:

• Developmental Psychology
• Neuroscience
• Clinical Psychology

Background:

• Infant visual orienting is key for social adaptation and learning.
• Impaired visual orienting may hinder language development.
• Limited research exists on visual orienting in infants with neurodevelopmental disorders beyond autism.

Purpose of the Study:

• To investigate visual orienting in infants/toddlers with Down syndrome (DS), fragile X syndrome (FXS), and Williams syndrome (WS).
• To compare visual orienting in these groups with typically developing (TD) controls matched for chronological age (CA) and mental age (MA).
• To examine the relationship between visual orienting and language ability in early development.

Main Methods:

• Utilized eye-tracking technology to assess visual orienting in infants/toddlers (~15 months).
• Included groups with DS, FXS, and WS, alongside CA- and MA-matched TD controls.
• Assessed language ability using the Mullen Scales of Early Learning (MSEL).

Main Results:

• The ability to disengage and shift visual attention correlated with language ability across all groups.
• Infants and toddlers with DS demonstrated slower attention disengagement compared to controls.
• Infants and toddlers with Williams syndrome did not show significant attention disengagement differences.

Conclusions:

• Visual orienting, particularly attention disengagement, is a critical factor constraining language development.
• Attention disengagement is impaired in infants and toddlers with Down syndrome.
• Early assessment of visual orienting may inform interventions for developmental disorders.