Bilateral Ventral Pathways Support Phonological Awareness at Reading Onset in Spanish-Speaking Children

Area of Science:

• Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Reading acquisition is a fundamental skill with complex neural underpinnings.
• Research on reading's neural basis is extensive in adults but limited in children, particularly across diverse languages.
• Existing models often propose distinct dorsal and ventral pathways for reading-related functions.

Purpose of the Study:

• To investigate the white matter correlates of phonological awareness in young, monolingual, Spanish-speaking children.
• To examine the generalizability of established reading pathway models to different linguistic contexts.
• To challenge the traditional dorsal-ventral stream dichotomy in the context of early reading development.

Main Methods:

• Diffusion tensor imaging (DTI) was used to assess white matter microstructure.
• Fractional anisotropy (FA) values were correlated with phonological awareness scores.
• The study focused on a cohort of monolingual Mexican Spanish-speaking children.

Main Results:

• Fractional anisotropy in bilateral ventral tracts positively correlated with phonological awareness.
• No significant correlation was found between dorsal tracts and phonological awareness.
• Findings suggest a divergence from the classical left-lateralized dorsal pathway model.

Conclusions:

• The neural basis of phonological awareness in early reading development may rely on bilateral ventral pathways in this population.
• Results challenge the rigid dorsal-ventral stream functional segregation for reading.
• Neural mechanisms supporting reading acquisition appear flexible and language-dependent.