Examining interhemispheric processing and task demand in lexical decision-making: insights from lateralized visual field paradigm

Kim, Sangyub; Nam, Kwanghee

doi:10.3389/fpsyg.2023.1208786

Cited by 3 publications

(1 citation statement)

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“…The present investigation employed a visual half-field presentation paradigm involving both split and identical word presentations to scrutinize the extent to which foveal word recognition aligns with the SFT as opposed to the BPT, particularly in the context of interhemispheric inhibitory regulation. In accordance with the visual half-field presentation paradigm, it is assumed that stimuli presented in the parafoveal region are initially processed by the contralateral hemisphere ( Kim et al, 2020 , 2022a , b , 2023 ; Kim and Nam, 2023a , b ). Specifically, stimuli appearing in the right visual field (RVF) are initially processed by the left hemisphere (LH), and conversely, stimuli in the left visual field (LVF) are processed by the right hemisphere (RH).…”

Section: Introductionmentioning

confidence: 99%

Decoding foveal word recognition: the role of interhemispheric inhibition in bilateral hemispheric processing

Kim,

Nam

2023

Front. Psychol.

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Extant research has largely favored the Split Fovea Theory (SFT) over the Bilateral Projection Theory (BPT) in the context of foveal word recognition. SFT posits that during foveal fixation, letters in the left and right visual fields are projected to their respective contralateral hemispheres, thereby facilitating a division of labor across the bilateral hemispheres. This division may serve as a regulatory mechanism to mitigate redundant processing in both hemispheres. The present investigation conducted two experiments utilizing Korean visual words to explore whether this hemispheric division in foveal word recognition is a strategy to circumvent potential interhemispheric inhibition arising from duplicated processing. Experiment 1 established the suitability of Korean visual words for studies involving both unilateral and bilateral presentations. Experiment 2 revealed that the split presentation of a word elicited greater accuracy compared to its identical presentation in the bilateral visual fields. These findings lend credence to the notion that interhemispheric inhibition may drive the hemispheres to engage in divided labor, thereby reducing processing redundancy in foveal word recognition.

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confidence: 99%

Decoding foveal word recognition: the role of interhemispheric inhibition in bilateral hemispheric processing

Kim,

Nam

2023

Front. Psychol.

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The time course of syllable frequency effects in the visual recognition of Korean morphologically complex nouns: an ERP study

Kwon,

Lee,

Kim

et al. 2024

Front. Lang. Sci.

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IntroductionThe syllable frequency effect refers to that during the lexical decision task, words beginning with high-frequency syllables elicit slower responses than words beginning with low-frequency ones, indicating an inhibitory effect. However, previous studies in Korean have yielded mixed results. For morphologically simple words, an inhibitory or null effect has been observed, whereas in morphologically complex words, a facilitative effect has been reported. Unfortunately, the explanations for these mixed findings remain unclear. This study employed both behavioral and electrophysiological methods to investigate the temporal dynamics of the facilitative syllable frequency effect in Korean morphologically complex nouns. A secondary aim was to explore whether syllable frequency is modulated by stem length as a factor in morphological processing, at both the behavioral and neurophysiological levels.MethodsTwenty-eight participants (mean age = 25.14, 9 female) performed a lexical decision task, responding whether visually presented stimuli were valid Korean words, while EEG data were recorded. The experimental condition included syllable frequency (2: High vs. low) and stem length (2: Long vs. Short).ResultsThe behavioral data showed that lexical decision latencies were faster for morphologically complex nouns with higher syllable frequencies compared to those with lower frequencies. The ERP data revealed a significant syllable frequency effect on the P300 component, reflecting early visual word processing. However, no significant effect was found in the N400 component. Although stem length did not significantly influence behavioral results, it did show significant differences in N250 amplitudes. Notably, an interaction between syllable frequency and stem length had a significant effect on N400, in contrast to the behavioral findings.DiscussionsThe findings suggest that, in the processing of morphologically complex words in Korean, syllable frequency serves as partial information that facilitates lexical decisions through the fast-guess mechanism, as proposed by the MROM-S model. Furthermore, the delayed time window for syllable processing may stemmed from a different stage of the processing between morphologically complex words and morphologically simple words. Lastly, stem length, as a form of morphological processing, may interact with syllable frequency during the lexical access stage.

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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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Examining interhemispheric processing and task demand in lexical decision-making: insights from lateralized visual field paradigm

Cited by 3 publications

References 34 publications

Decoding foveal word recognition: the role of interhemispheric inhibition in bilateral hemispheric processing

Decoding foveal word recognition: the role of interhemispheric inhibition in bilateral hemispheric processing

The time course of syllable frequency effects in the visual recognition of Korean morphologically complex nouns: an ERP study

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

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