English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  An fMRI parametric study of shape from disparity and perspective in the human visual cortex

Deubelius, A., Welchman, A., Kourtzi, Z., & Logothetis, N. (2003). An fMRI parametric study of shape from disparity and perspective in the human visual cortex. Poster presented at 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003), New Orleans, LA, USA.

Item is

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Deubelius, A1, 2, Author              
Welchman, AE2, 3, Author              
Kourtzi, Z1, 2, 3, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

Content

show
hide
Free keywords: -
 Abstract: Humans can perceive object shape based on a range of different sources of visual information (or cues). Two cues to shape, that the visual system appears to be especially sensitive to, are horizontal binocular disparity and geometric perspective. This study examined the relationship between fMRI activity in the human brain and the perception of shape from perspective and disparity cues. Observers viewed open book stimuli consisting of a hinged plane receding symmetrically in depth. We parametrically varied the dihedral angle between the planes. Observers were required to judge which dihedral angle was larger (or more open) of two sequentially-presented stimuli. Stimuli were rear-projected inside a 3T scanner. Psychophysical judgments were made whilst fMRI responses were collected concurrently. We employed an event-related fMRI adaptation paradigm in which stimulus changes result in increased fMRI responses (rebound effect) compared with repeated presentation of the same stimuli. Psychophysical data were fit using Probit analysis and the perceptual discriminability of different stimuli was calculated. We examined fMRI responses in early retinotopic visual areas, higher object-related (Lateral Occipital Complex-LOC) and motion-related (hMT+/V5) areas. We observed significant fMRI rebound effects, that is increased responses compared with repeated presentation of the same stimulus, in early and higher visual areas. These rebound effects were consistent with the discriminability of the perceived shape in areas LOC hMT+/V5. These results suggest that both object and motion-related visual areas are involved in the perception of 3D shapes from multiple visual cues.

Details

show
hide
Language(s):
 Dates: 2003-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 2384
 Degree: -

Event

show
hide
Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Place of Event: New Orleans, LA, USA
Start-/End Date: 2003-11-08 - 2003-11-12

Legal Case

show

Project information

show

Source 1

show
hide
Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: 179.12 Start / End Page: - Identifier: -