Lateralized displays reveal the perceptual locus of the syllable transposition effect in Korean

Kim, Sangyub; Paterson, Kevin B.; Nam, Kichun; Lee, Changhwan

doi:10.1016/j.neuropsychologia.2024.108907

Neuropsychologia

2024

DOI: 10.1016/j.neuropsychologia.2024.108907

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Lateralized displays reveal the perceptual locus of the syllable transposition effect in Korean

Sangyub Kim,

Kevin B. Paterson,

Kichun Nam

et al.

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2024

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Cited by 2 publications

References 77 publications

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Contributions of hemispheric dynamics in visual word recognition: uncovering familiarity effects through lateralized priming

Kim,

Nam

2024

Front. Psychol.

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IntroductionThis investigation aimed to explore interhemispheric interactions in visual word processing with a focus on proficiency development. Given the asymmetrical specialization in visual word processing across hemispheres, the study hypothesized that the primary hemisphere predominantly regulates interhemispheric interactions. The familiarity effect, serving as a measure of visual word processing proficiency, was examined to determine how proficiency influences these interactions.MethodsA primed-lateralized lexical decision task with a stimulus onset asynchrony (SOA) of 100 ms was employed. The task involved presenting primes and targets in parafoveal visual fields (left visual field/right visual field) to assess behavioral responses. By manipulating prime and target visual field locations, the study aimed to evaluate both inter- and intrahemispheric interactions during visual word processing.ResultsThe findings revealed a significant interhemispheric familiarity effect in response times when the left visual field (LVF)/right hemisphere (RH) served as the prime and the right visual field (RVF)/left hemisphere (LH) as the target. Additionally, a significant intrahemispheric familiarity effect was observed within the LVF/RH condition, suggesting a prominent role of the RH in visual-perceptual processing during the development of visual word recognition proficiency.DiscussionThese results provide compelling evidence for asymmetric specialization between the hemispheres in visual word processing. The significant inter- and intrahemispheric familiarity effects underscore the importance of RH visual-perceptual processing in proficiency development. These insights enhance our understanding of interhemispheric dynamics in the evolution of visual word recognition proficiency, highlighting the complex coordination between hemispheres in facilitating fluent visual word processing.

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Contributions of hemispheric dynamics in visual word recognition: uncovering familiarity effects through lateralized priming

Kim,

Nam

2024

Front. Psychol.

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Neural Dynamics of Processing Inflectional Morphology: An fMRI Study on Korean Inflected Verbs

Kim,

Nam

2024

Brain Sciences

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The present study aimed to elucidate the neural mechanisms underpinning the visual recognition of morphologically complex verbs in Korean, a morphologically rich, agglutinative language with inherent polymorphemic characteristics. In an fMRI experiment with a lexical decision paradigm, we investigated whether verb inflection types (base, regular, and irregular) are processed through separate mechanisms or a single system. Furthermore, we explored the semantic influence in processing inflectional morphology by manipulating the semantic ambiguity (homonymous vs. unambiguous) of inflected verbs. The results showed equivalent activation levels in the left inferior frontal gyrus for both regular and irregular verbs, challenging the dichotomy between the two. Graded effects of verb regularity were observed in the occipitotemporal regions, with regular inflections eliciting increased activation in the fusiform and lingual gyri. In the middle occipital gyrus, homonyms showed decreased activation relative to that of unambiguous words, specifically for base and irregular forms. Furthermore, the angular gyrus exhibited significant modulation with all verb types, indicating a semantic influence during morphological processing. These findings support single-system theories and the connectionist framework, challenging the assumptions of purely orthographic morphological decomposition and dual-mechanism accounts. Furthermore, they provide evidence for a semantic influence during morphological processing, with differential reliance on semantic activation for regular and irregular inflections.

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Lateralized displays reveal the perceptual locus of the syllable transposition effect in Korean

Cited by 2 publications

References 77 publications

Contributions of hemispheric dynamics in visual word recognition: uncovering familiarity effects through lateralized priming

Contributions of hemispheric dynamics in visual word recognition: uncovering familiarity effects through lateralized priming

Neural Dynamics of Processing Inflectional Morphology: An fMRI Study on Korean Inflected Verbs

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