Interhemispheric transfer time differences in different frequencies between fast and slow healthy adult readers
Hazal Artuvan Korkmaz1,2,3
, Canan Kalaycıoğlu1,2,3
1Department of Physiology, Ankara University Faculty of Medicine, Ankara, Türkiye
2Brain Research Center, Ankara University, Ankara, Türkiye
3Neuroscience and Neurotechnology Center of Excellence, Ankara, Türkiye
Keywords: Alpha band, hemispheric lateralization, interhemispheric transfer times, oscillation, word reading.
Abstract
Objectives: The main objective of our study was to investigate the role of the interhemispheric callosal network, specifically focusing on the interhemispheric transfer times of different frequency bands during word reading.
Patients and methods: This experimental study involved healthy volunteers. Interhemispheric transfer time was calculated as the latency difference of event-related potentials between the contralateral and ipsilateral hemispheres. Interhemispheric transfer times for alpha, theta, and beta frequency bands were separately calculated in electroencephalogram recordings during word reading. We then analyzed differences in interhemispheric transfer times between fast and slow adult readers, with a particular focus on the directionality of interhemispheric transmission.
Results: Our findings revealed a specific slowness in right to left transmission within the alpha band for slow readers.
Conclusion: Slower interhemispheric transfer time during word decoding and lexicon access in slow readers may be attributed to a neuronal synchronization problem caused by alpha oscillations in smaller-diameter axonal callosal channels. Considering the existing research on alpha oscillation and attention networks, we propose that this result may indicate a difference in attention processes between the two groups. The study sheds light on the importance of callosal network dynamics, specifically alpha oscillations in reading, offering insights into the underlying neural mechanisms and potential attention-related differences between fast and slow readers.
Cite this article as: Artuvan Korkmaz H, Kalaycıoğlu C. Interhemispheric transfer time differences in different frequencies between fast and slow healthy adult readers. Turk J Neurol 2026;32(1):50-61. https://doi.org/10.55697/tnd.2026.444.
The data that support the findings of this study are available from the corresponding author upon reasonable request.
H.A.K.: Idea/concept, design, data collection and processing, analysis, literature review, writing the article and materials; C.K.: Idea/ concept, design, analysis, writing the article, control, critical review and funding.
The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.
This work was supported by the Ankara University Scientific Research Projects Coordinatorship under Grant 18L0230001.
The authors declare that artificial intelligence (AI) tools were not used, or were used solely for language editing, and had no role in data analysis, interpretation, or the formulation of conclusions. All scientific content, data interpretation, and conclusions are the sole responsibility of the authors. The authors further confirm that AI tools were not used to generate, fabricate, or ‘hallucinate’ references, and that all references have been carefully verified for accuracy.