Korean Journal of Cognitive Science (인지과학)

The Korean Society for Cognitive Science (한국인지과학회)
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The effect of immediate and delayed recognition memory on event-related potential(ERP)

즉각적 재인 기억과 지연 재인 기억이 사건과련전위에 미치는 영향

  • 김명선 (서울대학교 의대학 정신과학교실) ;
  • 조상수 (서울대학교 의대학 정신과학교실) ;
  • 권준수 (서울대학교 대학원 인지과학협동과정)
  • Published : 2000.12.01
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Abstract

The effect of immediate and delayed recognition memory on event-related potential (ERP) was studied using a continuous recognition memory task and event-related potential (ERP). Among 240 stimulus words 40 words were not repeated. 100 were immediately repeated and 100 were repeated after 5 intervening words. All words presented only once during the experiment were referred to as new words. Subjects responded faster and more accurately to words repeated immediately than to new words a and to those repeated after intervening words. In terms of ERP results the immediately repeated words were associated with large P300 amplitude, early P300 latency and a absence of N400. while words repeated after a delay were associated with small P300 a amplitude. late P300 latency and the presence of N400. N400 was elicited only to new w words and to those repeated after a delay. The general morphology of the waveform was s similar for three stimulus-presentation conditions until around 3l0ms after the onset of stimulus. These results indicate that immediate and delayed recognition memory could be dissociated into two distinct processes possibly being mediated by different cerebral mechanism, and the dissociation between two types of recognition memory emerges around 3l0ms poststim'ulus. The immediate and delayed recognition memory for words are considered in terms of template matching and memory searching.

즉각적 재인 기억과 지연 재인 기억이 사건관련전위에 미치는 영향을 연속재인 과제를 사용하여 조사하였다. 240개의 자극 단어 중에서 100개는 즉각적으로 반복제시되었고 100개는 5개의 간섭 단어 후에 지연 반복제시되었으며 40개는 반복제시되지 않았다 .반복제시된 단어 중 처음 제시된 경우와 전혀 반복제시 되지 않은 단어를 새로운 단어로이름하였다. 새로운 단어와 지연 반복제시된 단어에 비해 즉각적으로 반복제시된 단어에 대한 반응시간이 유의하게 빨랐고, 재인정확율도 높았다. 사건관련전위를 분석한 결과 즉각적 반복제시 단어에서는 P300의 진폭이 감소하였고 잠복기가 짧았던 반면 지연 반복제시 단어에서는 P300의 진폭이 감소하였고 잠복기가 길었다. 그리고 즉각적 반복제시 단어에서는 N400이 관찰되지 않은 반면 새로운 단어와 자연 반복제시 단어에서는 N400이 관찰되었다. 자극제시 조건에 따른 사건관련전위는 자극 제시 310ms이후부터 서로 다른 양상을 보이기 시작하였다. 본 연구 결과는 즉각적 재인 기억과 지연 재인기억이 서로 분리될 있다는 것, 다시 말하면 서로 다른 대뇌 기전에 근거하고 있을 가능성이 높다는 것을 시사한다. 단어에 대한 즉각적 및 지연 재인을 형판 비교와 기억 탐색의 관점에서의 논의하였다.

Keywords

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