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conference paper

Crowding and shape representations

Manassi, Mauro  
•
Clarke, Aaron
•
Herzog, Michael H.  
2015
Perception
38th European Conference on Visual Perception (ECVP)

In crowding, target perception deteriorates when flanking elements are added. Crowding is traditionally characterized by target-flanker interactions which are (1) deleterious, (2) spatially confined within Bouma’s window, and (3) feature specific. Here, we show that none of these assumptions universally hold true. We determined vernier offset discrimination thresholds at 9° of eccentricity. When the vernier was embedded in a square, thresholds increased compared to the unflanked threshold. Surprisingly, when the vernier was flanked by three additional squares on either side, crowding strongly decreased. Similar results hold true for other shapes, including unfamiliar, irregular shapes. In addition, changing the flanking shapes’ orientations led to increases in crowding. These results show that (1) more flankers can decrease crowding, (2) crowding strength can be determined by elements outside Bouma’s window and (3) shape processing can determine vernier offset thresholds. We propose that visual acuity for each element in the visual scene depends on all elements in the entire visual field and, on top of that, on the overall spatial configuration. In addition, these results provoke the question of whether the human brain is, indeed, coding any type of shapes at all locations in the visual field.

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Type
conference paper
Web of Science ID

WOS:000362287800430

Author(s)
Manassi, Mauro  
Clarke, Aaron
Herzog, Michael H.  
Date Issued

2015

Publisher

Sage Publications Ltd

Publisher place

London

Published in
Perception
Total of pages

2

Volume

44

Start page

215

End page

216

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPSY  
Event nameEvent placeEvent date
38th European Conference on Visual Perception (ECVP)

Liverpool, UK

August 23-27, 2015

Available on Infoscience
December 2, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/120944
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