Neural Substrates of Picture Encoding: An fMRI Study

그림의 부호화 과정과 신경기제 : fMRI 연구

  • 강은주 (서울대학교 의학 연구원 방사선 의학 연구소) ;
  • 김희정 (서울대학교 대학원 인지과학 협동과정) ;
  • 김성일 (광운대학교 산업심리학과) ;
  • 나동규 (성균관 대학교 의과대학 방사선의학과) ;
  • 이경민 (서울대학교 의과대학 신경과) ;
  • 나덕렬 (성균관 대학교 의과대학 신경과) ;
  • 이정모 (성균관 대학교 사회과학대학 심리학과)
  • Published : 2002.03.01

Abstract

This study is to examine brain regions that are involved in picture encoding in normal adults using fMRI methods. In Scan 1, the picture encoding was studied during a semantic categorization task in comparison with word. In Scan 2 task type effects were studied both during a picture naming task and during a semantic categorization task with pictures. Subjects were asked to make decision either by pressing a mouse button (Scan 1) or by responding subvocally (naming or saying yes/no) (Scan 2). Regardless of stimulus type, left prefrontal, bilateral occipital, and parietal activations were observed during semantic processing in comparison with fixation baseline. Processing of word stimulus relative to picture resulted in activations in prefrontal and parieto-temporal regions in the left side while that of picture stimulus relative to word resultd in activations in bilateral extrastriatal visual cortices and parahippocampal regions. In spite of the same task demands, stimulus-specific information processings were involved and mediated by different neural substrates; the word encoding was associated with more semantic/lexical processings than pictures and the picture processing associated with more perceptual and novelty related information processings than word. Activations of dorsal part of inferior prefrontal region, i.e., Broca's areas were found both during the picture naming and during the semantic tasks subvocally performed Especially, during the picture naming task, greater occipital activations were found bilaterally relative to the semantic categorization task. indicating a possibility that greater and higher visual processing was involved in retrieving the name referred by picture stimuli.

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