Sparse representation of global features of visual images in human primary visual cortex: Evidence from fMRI

Songnian Zhao, Li Yao*, Zhen Jin, Xiaoyun Xiong, Xia Wu, Qi Zou, Guozheng Yao, Xiaohong Cai, Yijun Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In fMRI experiments on object representation in visual cortex, we designed two types of stimuli: one is the gray face image and its line drawing, and the other is the illusion and its corresponding completed illusion. Both of them have the same global features with different minute details so that the results of fMRI experiments can be compared with each other. The first kind of visual stimuli was used in a block design fMRI experiment, and the second was used in an event-related fMRI experiment. Comparing and analyzing interesting visual cortex activity patterns and blood oxygenation level dependent (BOLD)-fMRI signal, we obtained results to show some invariance of global features of visual images. A plausible explanation about the invariant mechanism is related with the cooperation of synchronized response to the global features of the visual image with a feedback of shape perception from higher cortex to cortex V1, namely the integration of global features and embodiment of sparse representation and distributed population code.

Original languageEnglish
Pages (from-to)2165-2174
Number of pages10
JournalChinese Science Bulletin
Volume53
Issue number14
DOIs
Publication statusPublished - Jul 2008
Externally publishedYes

Keywords

  • FMRI experiment
  • Feedback
  • Global features of visual image
  • Integration
  • Nearly invariant representation
  • Primary visual cortex
  • Sparse representation strategy

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