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  4. The neural correlates of non-retinotopic processing in human visual cortex: a 7T fMRI study
 
conference paper

The neural correlates of non-retinotopic processing in human visual cortex: a 7T fMRI study

Thunell, Evelina
•
Van der Zwaag, Wietske  
•
Plomp, Gijs  
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2013
Journal of Vision
Vision Sciences Society Annual Meeting

Under normal viewing conditions, due to e.g. the motion of objects, the retinotopic representation of the environment constantly changes. Yet we perceive the world as stable and we easily keep track of moving objects, indicating the presence of non-retinotopic representations in the brain. We investigated the neural correlates of such non-retinotopic processing in the human visual cortex by means of high-resolution fMRI. To this end, we used a Ternus-Pikler display: Three horizontally aligned dark/light gray checker-boards moved back and fourth in a left-right apparent motion while participants kept their gaze fixated above the stimulus, resulting in a non-retinotopic integration of the elements across frames. In a second condition, only two checker-boards were presented at the same location in each frame, thus causing the elements to be integrated retinotopically. Crucially, the checker-boards could be either flickering, i.e. inverting polarity with each frame, or non-flickering. This retinotopic flickering or non-flickering is perceived in the 2-element conditions. In the 3-element conditions, however, because of the non-retinotopic correspondence, the percept is inverted such that the non-flickering checker-boards are perceived to flicker and vice versa. In V1, we found a higher BOLD response for retinotopically flickering stimuli, as expected, but the activity did not depend on the percept of flickering vs. non-flickering. In hMT+ we found a stronger response for the 3-element conditions, which could be due to the apparent motion as well as the larger size of the stimuli. More interestingly, there was also an interaction effect, namely higher activity for perceived flickering than perceived non-flickering. Thus, apart from the retinotopic properties of the stimuli, also the endogenous percept of non-retinotopic origin is reflected in the hMT+ activity.

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Type
conference paper
DOI
10.1167/13.9.682
Author(s)
Thunell, Evelina
Van der Zwaag, Wietske  
Plomp, Gijs  
Ögmen, Haluk
Herzog, Michael H.  
Date Issued

2013

Publisher

Association for Research in Vision and Ophthalmology

Published in
Journal of Vision
Volume

13

Issue

9

Start page

682

Subjects

fMRI

•

Ternus-Pikler display

•

non-retinotopic processing

•

apparent motion

•

hMT+

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPSY  
CIBM  
Event nameEvent placeEvent date
Vision Sciences Society Annual Meeting

Naples, Florida, USA

May 10-15, 2013

Available on Infoscience
January 11, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/99418
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