English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Influence of shading on biological motion perception: illusion and model

Fedorov, L., & Giese, M. (2015). Influence of shading on biological motion perception: illusion and model. Poster presented at 38th European Conference on Visual Perception (ECVP 2015), Liverpool, UK.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0004-DBE4-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-DBE5-3
Genre: Poster

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Fedorov, L1, Author              
Giese, M, Author              
Affiliations:
1External Organizations, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: Research on biological motion perception has focused on 2D motion and form cues, while shading cues were largely neglected. Using point-light stimuli with volumetric elements, we discovered a new visual illusion, where the change of the light source direction flips the perceived walking direction. We extended a neural model for biological motion perception (Giese, 2003) to account for this illusion. METHOD: Walker stimuli consisted of 3D conic shapes that were centered on the limbs and illuminated from different light-source positions. We studied the dependence of the perceived walking direction on the position of the light source. We extended the model by a new pathway, which processes shading cues by analysis of inner brightness gradients. RESULTS: The light source position has a strong influence on the perceived walking directions (F(16,176) > 178, p < 0.01), where illumination from below results in a flip of the perceived walking direction by 180 deg compared to the veridical direction. The model reproduces this illusion. A control experiment reveals the critical shading features that cause the illusion, consistent with predictions from the model. CONCLUSION: Biological motion perception is influenced by a lighting-from-above prior, similar to the perception of static shapes (Brewster, 1874; Ramachandran, 1988).

Details

show
hide
Language(s):
 Dates: 2015-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1177/0301006615598674
 Degree: -

Event

show
hide
Title: 38th European Conference on Visual Perception (ECVP 2015)
Place of Event: Liverpool, UK
Start-/End Date: 2015-08-22 - 2015-08-27

Legal Case

show

Project information

show

Source 1

show
hide
Title: Perception
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 44 (ECVP Abstract Supplement) Sequence Number: 2T2A003 Start / End Page: 177 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369