Writing letters in two graphic systems: Behavioral and neural correlates in Latin-Arabic biscripters

Area of Science:

• Neuroscience
• Cognitive Science
• Linguistics

Background:

• Biscriptuality, the ability to use two writing systems, is increasingly common but poorly understood.
• Investigating graphomotor processing in French-Arabic biscripters offers insights into how the brain handles distinct scripts.

Purpose of the Study:

• To examine graphomotor differences between French (Latin) and Arabic scripts.
• To determine if writing these scripts engages overlapping or distinct neural networks.
• To explore how script-specific features influence brain activity in biscripters.

Main Methods:

• Behavioral analysis of graphomotor features (pen lifts, stroke direction, curves, writing time) for French and Arabic letters.
• Functional magnetic resonance imaging (fMRI) to compare brain activation patterns during writing of both scripts.

Main Results:

• Arabic letters require more pen lifts, more right-to-left strokes, and more clockwise curves than Latin letters, suggesting different motor patterns.
• Both scripts activate the 'writing network', but Arabic letters show stronger recruitment of the left superior parietal lobule (SPL) and left primary motor cortex (M1).
• Distinct, non-writing network regions were activated differently by each script, correlating with graphomotor features.

Conclusions:

• The specific graphomotor characteristics of a script influence behavioral and neural processing in biscripters.
• Different scripts can lead to distinct motor organization and brain activation patterns, even within the same individual.
• This study highlights the brain's adaptability in processing diverse writing systems.