Document Detail

Perceptual continuity and the emergence of perceptual persistence in the ventral visual pathway.
MedLine Citation:
PMID:  15659528     Owner:  NLM     Status:  MEDLINE    
Perceptual continuity is an important aspect of our experience of the visual world. In this study, we focus on an example of perceptual continuity involving the maintenance of figure-ground segregation despite the removal of binding cues that initiated the segregation. Fragmented line drawings of objects were superimposed on a background of randomly oriented lines. Global forms could be discriminated from the background based on differences in motion or differences in color/brightness. Furthermore, perception of a global form persisted after the binding cue had been removed. A comparison between the persistence of forms constructed from motion or color demonstrated that both forms produced persistence after the object defining cues were removed. Functional imaging showed a gradual increase in the persistence of brain activity in the lower visual areas (V1, V2, VP), which reached significance in V4v and peaked in the lateral occipital area. There was no difference in the location of persistence for color- or motion-defined forms. These results suggest that the retention of a global percept is an emerging property of the ventral visual processing stream and the maintenance of grouped visual elements is independent of cue type. We postulated that perceptual persistence depends on a system of perceptual memory reflecting the state of perceptual organization.
Mary-Ellen Large; Adrian Aldcroft; Tutis Vilis
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2005-01-19
Journal Detail:
Title:  Journal of neurophysiology     Volume:  93     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-24     Completed Date:  2005-07-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3453-62     Citation Subset:  IM    
University of Western Ontario, Department of Psychology, Social Science Centre, London, Ontario N6A 5C2, Canada.
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MeSH Terms
Attention / physiology*
Brain / anatomy & histology,  blood supply,  physiology
Brain Mapping
Color Perception / physiology*
Functional Laterality
Image Processing, Computer-Assisted / methods
Magnetic Resonance Imaging / methods
Memory / physiology*
Motion Perception / physiology*
Oxygen / blood
Pattern Recognition, Visual / physiology
Photic Stimulation / methods
Visual Fields / physiology
Visual Pathways / physiology*
Reg. No./Substance:

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

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