Universal brain systems for recognizing word shapes and handwriting gestures during reading

Area of Science:

• Neuroscience
• Cognitive Science
• Linguistics

Background:

• Cross-cultural studies suggest reading neural circuits differ, particularly for complex systems like Chinese compared to alphabetic systems.
• Previous research often overlooked confounds in comparing different writing systems and reading behaviors.

Purpose of the Study:

• To investigate whether neural circuits for reading are universal or culturally specific.
• To control for confounds in cross-cultural comparisons of reading by using handwritten stimuli.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to study Chinese and French readers.
• Participants performed a semantic task using handwritten cursive words.

Main Results:

• Both Chinese and French readers showed similar activation patterns in two universal circuits: shape recognition (reading by eye) and gesture recognition (reading by hand).
• Identical patterns of activation and repetition priming were observed in both language groups, covering regions previously thought to be culture-specific.
• The occipitotemporal visual word-form system and Exner's area (left premotor region) were consistently activated.

Conclusions:

• The neural network for visual word recognition is more universal than previously suspected.
• Cultural influences on reading primarily modulate a fixed set of brain circuits based on orthographic features, rather than creating entirely different networks.