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ORIGINAL ARTICLE
Commun Sci Disord. 2021;26(1): 162-180.
Published online March 31, 2021.
doi: https://doi.org/10.12963/csd.21782
Age-Related Differences in Korean Word Recognition Associated with Phonological Rules and Word Frequency: An Event-Related Potential (ERP) Study
Hye Won Kang , and Hyun Sub Sim
Department of Communication Disorders, Ewha Womans University, Seoul, Korea
Corresponding Author: Hyun Sub Sim ,Tel: +82-2-3277-3538, Fax: +82-2-3277-2122, Email: simhs@ewha.ac.kr
Received January 3, 2021  Revised: February 1, 2021   Accepted February 12, 2021
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ABSTRACT
Objectives
The purpose of this study was to investigate age-related differences according to frequency of words and use of phonological rules in the Korean word recognition process between younger and elderly groups through Event-Related Potentials (ERP) analysis.
Methods
A total of 35 participants participated in this experiment. They were asked to judge whether the pronunciation of visual words was identical to the corresponding auditory words. Behavioral data and electrophysiological data were collected.
Results
Behavioral results revealed that the elderly group showed significantly lower accuracy and longer response time than the younger group. ERP analysis showed that there was no significant difference between the two groups in the 150-300 ms range. However, for the younger group, the N400 component was observed in the 300-500 ms range regardless of word frequency when the phonological rule was not applied and was more apparent under the low word frequency condition. The topographic patterns of the grand average ERP waveforms for the elderly group showed that the N400 component appeared only under high word frequency when the phonological rule was not applied. However, when the phonological rule was applied, the N400 component was observed only under the condition of low word frequency.
Conclusion
Differences in the pattern of applying phonological rules associated with word frequency were found between groups. The current study indicates that word frequency and aging may affect the ability to apply phonological rules. The result of age-related differences in ERP analysis reflects a decline in the simultaneous neural processing of phonological and semantic information.
Keywords: Aging | Korean word recognition | Phonological rule | Word frequency | P200 | N400
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