English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Selective Luminance Induction on Bright and Dark Regions in Textures

McDonald, J., & Tadmor, Y. (2004). Selective Luminance Induction on Bright and Dark Regions in Textures. Poster presented at 7th Tübingen Perception Conference (TWK 2004), Tübingen, Germany.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
McDonald, JS1, 2, Author              
Tadmor, Y, 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: It is thought that the "ON" and "OFF" channels, used for detecting luminance increments and decrements, are perceptually inseparable when we process complex textures. Here we show that this is not the case. Methods: a 256 grey-levels texture patch (0.5 x 0.5 deg.), with the characteristic second order statistics of natural images, was surrounded by a uniform luminance region of various sizes (up to 4.0 x 4.0 deg.). We have modulated the luminance of the surrounding region sinusoidally in time (at 0.6Hz) either above or below the mean luminance of the central texture. We found that this modulation induced changes in the perceived contrast of the central patch. Subjects were asked to null this induction by adjusting the depth of modulation of either the bright or the dark regions of the central texture. Results: when uniform surround luminance was modulated above the mean luminance of the central patch, subjects chose to null the perceived induction by primarily altering the modulation of the bright regions of the texture. Conversely, when uniform surround luminance was less than the mean of the central patch, subjects chose to null the induction by primarily altering the modulation of the dark regions of the texture. This implies that, in contradiction to previous reports, our perception of bright and dark regions in complex textures is mediated by perceptually segregated ONand OFF-channels.

Details

show
hide
Language(s):
 Dates: 2004-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: McDonaldT2004
 Degree: -

Event

show
hide
Title: 7th Tübingen Perception Conference (TWK 2004)
Place of Event: Tübingen, Germany
Start-/End Date: 2004-01-30 - 2004-02-01

Legal Case

show

Project information

show

Source 1

show
hide
Title: 7th Tübingen Perception Conference: TWK 2004
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Mallot, HA, Editor            
Ulrich, RD, Editor
Wichmann, FA1, Editor            
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 189 Identifier: ISBN: 3-927091-68-5