Document Detail

Preattentive and cognitive effects on perceptual completion at the blind spot.
MedLine Citation:
PMID:  8433918     Owner:  NLM     Status:  MEDLINE    
Our findings indicate that preattentive processes, such as the filling in of homogeneously colored areas, discrete dots, or bars across the blind spot, take into account both the color and the form that stimulate the retina around the optic disk. Perceptual completion of the "junction" of two opposite colors facing each other on opposite sides of the blind spot was resolved by simultaneous segregation of the two colors at the location of a filled-in perpendicular line that suggested a boundary separating the two colors. Orientation preference and relative salience of one color versus the other determined which color was perceptually completed in a forced-choice situation that involved perceptual completion at the intersection of a cross formed by bars of opposite colors. A 1-min exposure to these stimuli presented an ambiguous situation for perceptual completion of either color within the blind spot, and resulted in a perceptual "flip-flop" from one color to the other, much like the phenomenon that occurs in figure reversal. Instructions to speed up this reversal process led to a fivefold reduction in latency to first reversal.
R J Brown; J B Thurmond
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception & psychophysics     Volume:  53     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1993 Feb 
Date Detail:
Created Date:  1993-03-15     Completed Date:  1993-03-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  200-9     Citation Subset:  C    
Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia.
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MeSH Terms
Attention / physiology*
Color Perception / physiology*
Contrast Sensitivity / physiology
Discrimination Learning / physiology*
Optic Disk / physiology*
Pattern Recognition, Visual / physiology*
Retina / physiology*

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