Neural correlates of visual mean representation

시각적 평균 표상의 신경기제

  • Chong, Sang-Chul (Graduate program in Cognitive Science, Yonsei University) ;
  • Shin, Kil-Ho (Graduate program in Cognitive Science, Yonsei University) ;
  • Cho, Shin-Ho (Graduate program in Cognitive Science, Yonsei University)
  • 정상철 (연세대학교 대학원 인지과학 협동과정) ;
  • 신길호 (연세대학교 대학원 인지과학 협동과정) ;
  • 조신호 (연세대학교 대학원 인지과학 협동과정)
  • Published : 2008.03.31

Abstract

Visual scene contains lots of redundant information. To process this redundant information without increasing brain's volume, human visual system may summarize incoming information. If similar but different information are given to visual system, visual system extracts statistical properties of the information. One example of the statistical representation is representation of mean size. The mean representation is accurate and durable. The process of mean representation is suggested to be parallel. However, previous studies on the mean representation mostly used behavioral methods. The purpose of this study was to investigate which neural regions extracted the mean size of a set of circles using fMRI method. According to previous studies, BOLD signal of certain areas that were in charge of cousin stimuli decreased when the same stimuli presented repetitively. We used this paradigm and found that BOLD signal of right occipital area was decreased when same mean site was presented repeatedly. This results suggest that right occipital area is the locus of mean representation of visual stimuli.