English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Contrast sensitivity and appearance in briefly presented illusory figures

Rieger, J., & Gegenfurtner, K. (1999). Contrast sensitivity and appearance in briefly presented illusory figures. Spatial Vision, 12(3), 329-344. doi:10.1163/156856899X00193.

Item is

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Rieger, JW1, 2, Author              
Gegenfurtner, KR1, 2, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

Content

show
hide
Free keywords: -
 Abstract: We examined the contributions of brightness enhancement, illusory figure formation and figural completion to changes in contrast sensitivity in contour gaps. The brightness on the border of a Kanizsa-square and an outline square was measured as the point of subjective equality with the background (PSE) for small line targets. Increment and decrement thresholds were measured at the same location. We found that contrast thresholds were lower than in a control condition without inducers, and that the threshold reduction was independent of the contrast polarity of the inducers. This reduction cannot be explained by a simple summation of stimulus contrast and induced brightness. In a second experiment the inducers that define the contour of the Kanizsa and the outline square were changed so that the figure was no longer closed, keeping the local stimulus surround constant. Thresholds were equally reduced for all conditions, independently of whether the figure was completed or not, or whether an illusory contour was perceived or not. The results suggest that the reduction of contrast threshold in contour gaps is independent of the brightness perceived in these gaps and of the formation of an illusory figure. Processes that cause contrast threshold reduction in contour gaps also seem to operate independently of figural completion.

Details

show
hide
Language(s):
 Dates: 1999-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1163/156856899X00193
BibTex Citekey: 213
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Spatial Vision
  Other : Spatial Vis.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Utrecht, Netherlands : VNU Science Press
Pages: - Volume / Issue: 12 (3) Sequence Number: - Start / End Page: 329 - 344 Identifier: ISSN: 0169-1015
CoNE: https://pure.mpg.de/cone/journals/resource/954927621090