Document Detail

Processing 3D form and 3D motion: respective contributions of attention-based and stimulus-driven activity.
MedLine Citation:
PMID:  18805496     Owner:  NLM     Status:  MEDLINE    
This study aims at segregating the neural substrate for the 3D-form and 3D-motion attributes in structure-from-motion perception, and at disentangling the stimulus-driven and endogenous-attention-driven processing of these attributes. Attention and stimulus were manipulated independently: participants had to detect the transitions of one attribute--form, 3D motion or colour--while the visual stimulus underwent successive transitions of all attributes. We compared the BOLD activity related to form and 3D motion in three conditions: stimulus-driven processing (unattended transitions), endogenous attentional selection (task) or both stimulus-driven processing and attentional selection (attended transitions). In all conditions, the form versus 3D-motion contrasts revealed a clear dorsal/ventral segregation. However, while the form-related activity is consistent with previously described shape-selective areas, the activity related to 3D motion does not encompass the usual "visual motion" areas, but rather corresponds to a high-level motion system, including IPL and STS areas. Second, we found a dissociation between the neural processing of unattended attributes and that involved in endogenous attentional selection. Areas selective for 3D-motion and form showed either increased activity at transitions of these respective attributes or decreased activity when subjects' attention was directed to a competing attribute. We propose that both facilitatory and suppressive mechanisms of attribute selection are involved depending on the conditions driving this selection. Therefore, attentional selection is not limited to an increased activity in areas processing stimulus properties, and may unveil different functional localization from stimulus modulation.
A-L Paradis; J Droulez; V Cornilleau-Pérès; J-B Poline
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-30
Journal Detail:
Title:  NeuroImage     Volume:  43     ISSN:  1095-9572     ISO Abbreviation:  Neuroimage     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-05     Completed Date:  2009-02-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9215515     Medline TA:  Neuroimage     Country:  United States    
Other Details:
Languages:  eng     Pagination:  736-47     Citation Subset:  IM    
CNRS, UPR640, Laboratoire de Neurosciences Cognitives et Imagerie Cérébrale, 75013 Paris, France.
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MeSH Terms
Attention / physiology*
Brain Mapping / methods
Evoked Potentials, Visual / physiology
Form Perception / physiology*
Imaging, Three-Dimensional / methods
Magnetic Resonance Imaging / methods*
Motion Perception / physiology*
Photic Stimulation / methods*
Visual Cortex / physiology*
Visual Pathways / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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