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Yonsei Cognitive Science

Feedback in vision

 

일시: 10월 28일(금) 오후 4시

장소: 위당관 201호

주관: 인지과학연구소 및 휴먼과학기술센터

연사: 심원목(Assistant Professor of Biomedical Engineering, Sungkyunkwan University)

 

초록:

  Contrary to our seamless and unobstructed perception of the external world, raw sensory data are often only partial. In order to create enriched representations of the environment

from impoverished sensory data, our visual system reconstructs extensive details through top-down or feedback processing. I investigate how this feedback in the visual system serves

to create new static and dynamic representations “from scratch” in the early stages of processing where no feedforward information exists.

  Using fMRI and encoding methods, we show that intermediate features of a visual object, never presented in the retinal input but interpolated during kinetic transformations, are

reconstructed in population-level feature-selective responses in the primary visual cortex. I discuss how this research will bring a new perspective to our understanding of the visual cortex:

The early visual cortex may not be merely the front end where local computations of rudimentary visual features occur but also functions as a high-resolution buffer where bottom-up input

and top-down predictive signals converge.

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