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fMRI correlates of visual cue combination

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons84307

Welchman,  AE
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83879

Deubelius,  A
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84071

Maier,  SJ
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83839

Bülthoff,  HH
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84023

Kourtzi,  Z
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Welchman, A., Deubelius, A., Maier, S., Bülthoff, H., & Kourtzi, Z. (2003). fMRI correlates of visual cue combination. Poster presented at Third Annual Meeting of the Vision Sciences Society (VSS 2003), Sarasota, FL, USA.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-DB61-0
Abstract
Recent models of cue combination (e.g. Landy et al., 1995, Vis Res, 35, 389) suggest that the perception of an object’s 3D shape is mediated by the combination of different depth cues (e.g. disparity and texture). We used fMRI to investigate the neural substrates of this process. Methods: Vertical cylinders defined by binocular disparity and texture cues were rear-projected inside a 3T scanner. We studied cylinders in which both disparity and texture specified the same curvature (consistent cues), and cylinders in which the two cues specified different curvatures (inconsistent cues). Prior to conducting fMRI experiments, subjects adjusted the curvature of consistent cue cylinders so that their perceived curvature was similar to that of the inconsistent ones. Performance in this task was used to define stimuli with consistent cues that were perceived to have similar curvature to the inconsistent cue stimuli. We employed a sequential-presentation fMRI adaptation technique, in which stimulus changes result in increased fMRI responses compared with repeated presentation of the same stimuli. Results: We observed increased responses in the Lateral Occipital Complex (LOC) and hMT(V5)+ when the subjects discriminated curvature changes. In contrast, adaptation in these regions was observed when subjects perceived similar curvature. Conclusions: These findings suggest that visual areas LOC and hMT(V5)+ are involved in the processing of perceived 3D shape based on the combination of disparity and textures cues.