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A view of visual adaptation from a different position
Author(s) -
Whitaker D.,
McGraw P. V.,
Levi D. M.
Publication year - 1997
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1997.97807259.x
Subject(s) - luminance , stimulus (psychology) , illusion , second order stimulus , artificial intelligence , psychophysics , optical illusion , contrast (vision) , psychology , computer vision , visual perception , mathematics , computer science , pattern recognition (psychology) , cognitive psychology , perception , neuroscience
Purpose: To examine the effect of adaptation upon perceived visual location of luminance‐defined and texture‐defined stimuli. Methods: We describe an illusion in which 5 sec of adaptation to an antisymmetric Gaussian stimulus results in a marked perceived misalignment in a subsequently‐viewed 3‐Gaussian blob stimulus. The magnitude of perceived misalignment was established for various levels of adapting and test contrast. Results: The effect of varying the contrast of the adapting and test stimuli depends only upon the ratio of adapting/test contrast. Adaptation effects for luminance‐ and texture‐defined stimuli differ in terms of inter‐ocular transfer and rate of decay. Whilst adapting and testing to the same type of stimulus (luminance‐ or texture‐defined) produces large shifts in perceived position, little or no crossover was found. The data are accounted for by a model in which the centroid of the linear combination of after‐image and test stimulus is extracted. Conclusion: The perceived location of both luminance‐ and texture‐defined stimuli can be strongly influenced by appropriate adapting stimuli. However, the adaptation processes for both types of stimuli remain independent and demonstrate different characteristics.