Cerebral Lateralization During Handwritten and Typed Word Generation: A Functional Transcranial Doppler Ultrasound...

Area of Science:

• Neuroscience
• Cognitive Science
• Linguistics

Background:

• Cerebral lateralization for language is typically left-dominant.
• Most studies focus on handwriting, neglecting typing, a common writing method.
• Understanding typing's cerebral lateralization is crucial for a complete picture of written language processing.

Purpose of the Study:

• To compare cerebral lateralization between typing and handwriting.
• To investigate if handedness influences cerebral lateralization in these writing methods.
• To examine typing's lateralization, previously unstudied.

Main Methods:

• Used functional transcranial Doppler (fTCD) ultrasound to measure cerebral blood flow.
• Assessed 24 left-handers and 30 right-handers performing typing and handwriting tasks.
• Employed a Bayesian analysis framework to evaluate differences and absence of differences.

Main Results:

• Found no significant difference in cerebral lateralization between typing and handwriting after movement artifact correction.
• Results did not conclusively support or refute differences in lateralization between left-handers and right-handers.
• Bayesian analysis provided evidence for the absence of a difference between writing methods.

Conclusions:

• Cerebral lateralization for typing and handwriting is comparable when movement artifacts are controlled.
• The role of handedness in cerebral lateralization for typing and handwriting remains unclear.
• Further investigation is required to elucidate handedness effects on written language lateralization across different modalities.