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Research Article

P300 and behavioral responses to a cross-category deviant in lexical context

어휘 문맥 속 교차 범주 자극에 대한 P300 및 행동 반응

Ji Young Lee1
,
Mark S. Hedrick2
,
Ashley W. Harkrider2*
이 지영1
,
Hedrick Mark S.2
,
Harkrider Ashley W.2*
1Department of Audiology and Speech Pathology, Daegu Catholic University
2Department of Audiology and Speech Pathology, University of Tennessee Health Science Center
*Corresponding Author
31 March 2025. pp. 144-152
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Abstract

The present study aims to explore whether P300 and behavioral responses reflect the influence of lexical context on categorical perception of speech. A prototypical /bi/ sound and a cross-category sound of /bi/ and /pi/ were embedded within lexical contexts of /bi/ (‘bee sting’) and /pi/ (‘pea soup’), as standard and deviant stimuli, respectively, in an active oddball paradigm. A total of 450 stimuli composed of 369 standard stimuli (81 %) and 81 deviant stimuli (19 %) were presented for each lexical context. Event-Related Potential (ERP) responses were measured from 9 electrodes in 21 young adults with normal hearing. Electrophysiological data (P300 amplitude and P300 latency) and behavioral data (response accuracy and reaction times) were analyzed. Results showed no significant differences in P300 amplitude, P300 latency, and response accuracy between the /bi/ and /pi/ contexts while reaction times were faster in the /pi/ context compared to /bi/ context. While the behavioral response reflected the Ganong effect, the electrophysiological results support the autonomous model of speech perception, as pre-lexical processing indexed by the P300 was not affected by top-down feedback from lexical influence.

Keywords
Event-Related Potential (ERP)
P300
Oddball paradigm
Categorical perception
Ganong effect
Lexical context

본 연구의 목적은 범주 지각에 미치는 어휘 문맥의 영향이 P300와 행동 반응에 나타나는지 알아보는 것이다. 7단계 /bi/-/pi/ 연속체 중 전형적인 /bi/ 소리와 /bi/와 /pi/ 사이의 교차 범주 소리가 /bi/ 문맥(‘bee sting’)과 /pi/ 문맥(‘pea soup’)에 삽입되어 각각 능동적 오드볼 패러다임의 표준 자극과 이탈 자극으로 사용되었다. 총 450개의 자극 (369개 표준 자극, 81 %; 81개 이탈 자극, 19 %)이 각 어휘 문맥에서 제시되었다. 정상청력을 가진 성인 21명을 대상으로 9개의 전극을 사용하여 Event-Related Potential(ERP) 반응을 측정하였다. 전기생리학적 데이터(P300진폭 및 잠복기)와 행동 반응 데이터(반응 정확도 및 반응 시간)의 분석 결과, P300 진폭 및 잠복기와 반응 정확도는 어휘 문맥에 따라 다르게 나타나지 않았고, 반응 시간은 /bi/ 문맥보다 /pi/ 문맥에서 더 빨랐다. 행동 반응은 가농 효과를 반영한 반면, 전기생리학적 결과는 P300가 나타내는 어휘 이전 단계의 처리가 어휘 문맥의 탑다운 피드백의 영향을 받지 않았다는 점에서 음성 지각의 자율적 모델을 뒷받침하고 있다.

키워드
사건관련전위
P300
오드볼 패러다임
범주 지각
가농 효과
어휘 문맥
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 44
  • No :2
  • Pages :144-152
  • Received Date : 2024-12-17
  • Revised Date : 2025-01-16
  • Accepted Date : 2025-02-03
  • DOI :https://doi.org/10.7776/ASK.2025.44.2.144
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