Difference between revisions of "Chubb illusion" - New World Encyclopedia
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| − | + | The '''Chubb illusion''' is an [[optical illusion]] wherein the apparent [[contrast]] of a patterned object varies dramatically, depending on the context of the presentation.<ref>Lotto, R.B., & Purves, D. [http://www.mind.duke.edu/files/sites/purves/pub/3551328687.pdf "An Empirical Explanation of the Chubb Illusion"] ''Journal of Cognitive Neuroscience'', 2001. Vol. 13, Number 5. Retrieved September 24, 2007.</ref> | |
| − | == | + | ==Discovery== |
| + | The phenomenon was first observed by Charles Chubb and colleagues Sperling and Solomon, who published their findings in the December 1989 edition of ''Proceedings of the National Academy of Sciences USA'' in an article entitled "Texture interactions determine perceived contrast". | ||
| − | + | ==Description== | |
| + | To illustrate the Chubb illusion, a circle of low contrast texture or pattern is placed in two different fields. When placed in a plain gray field, the circle appears to have more contrast than when it is placed in a field that surrounds it with high contrast texture or pattern. | ||
| + | ==Explanation== | ||
| + | The lower contrast image is perceived to be higher contrast when placed in front of a gray background because the gray background is more ambiguous than the high contrast background. The brain is used to interpreting images that are subject to "imperfect transmittance"; viewing objects from a distance, through fog, or through water or glass are examples of imperfect transmittance. In these cases, the brain compensates for the lower levels of light that actually fall upon the [[retina]] in an attempt to judge the true colors or contrast of the object. When placed in front of a gray background, the contrast pattern seems more high contrast because the ambiguous gray background causes the brain to interpret the image using imperfect transmittance. With the high contrast background, it is more obvious that there is nothing hindering the transmittance of light from the image, and the brain perceives the image more accurately.<ref>Lotto, R.B., & Purves, D. [http://www.mind.duke.edu/files/sites/purves/pub/3551328687.pdf "An Empirical Explanation of the Chubb Illusion"] ''Journal of Cognitive Neuroscience'', 2001. Vol. 13, Number 5. Retrieved September 24, 2007.</ref> | ||
| + | ==Applications== | ||
| + | The study of the Chubb illusion is a useful tool that helps neuroscientists understand the relationship between vision and perception. | ||
| + | ==Notes== | ||
| + | <references/> | ||
| + | ==References== | ||
| + | Chubb C, Sperling G, Solomon JA. "Texture interactions determine perceived contrast." ''Proc Natl Acad Sci U S A.'' 1989 Dec;86(23):9631-5. PMID 2594791. | ||
| − | ==External | + | ==External Links== |
*[http://www.purveslab.net/main Dale Purves Lab] | *[http://www.purveslab.net/main Dale Purves Lab] | ||
| − | + | *[http://listverse.com/miscellaneous/20-amazing-optical-illusions/ The Chubb illusion and others.] | |
{{Credits|Chubb_illusion|112180256|}} | {{Credits|Chubb_illusion|112180256|}} | ||
Revision as of 14:27, 24 September 2007
The Chubb illusion is an optical illusion wherein the apparent contrast of a patterned object varies dramatically, depending on the context of the presentation.[1]
Discovery
The phenomenon was first observed by Charles Chubb and colleagues Sperling and Solomon, who published their findings in the December 1989 edition of Proceedings of the National Academy of Sciences USA in an article entitled "Texture interactions determine perceived contrast".
Description
To illustrate the Chubb illusion, a circle of low contrast texture or pattern is placed in two different fields. When placed in a plain gray field, the circle appears to have more contrast than when it is placed in a field that surrounds it with high contrast texture or pattern.
Explanation
The lower contrast image is perceived to be higher contrast when placed in front of a gray background because the gray background is more ambiguous than the high contrast background. The brain is used to interpreting images that are subject to "imperfect transmittance"; viewing objects from a distance, through fog, or through water or glass are examples of imperfect transmittance. In these cases, the brain compensates for the lower levels of light that actually fall upon the retina in an attempt to judge the true colors or contrast of the object. When placed in front of a gray background, the contrast pattern seems more high contrast because the ambiguous gray background causes the brain to interpret the image using imperfect transmittance. With the high contrast background, it is more obvious that there is nothing hindering the transmittance of light from the image, and the brain perceives the image more accurately.[2]
Applications
The study of the Chubb illusion is a useful tool that helps neuroscientists understand the relationship between vision and perception.
Notes
- ↑ Lotto, R.B., & Purves, D. "An Empirical Explanation of the Chubb Illusion" Journal of Cognitive Neuroscience, 2001. Vol. 13, Number 5. Retrieved September 24, 2007.
- ↑ Lotto, R.B., & Purves, D. "An Empirical Explanation of the Chubb Illusion" Journal of Cognitive Neuroscience, 2001. Vol. 13, Number 5. Retrieved September 24, 2007.
ReferencesISBN links support NWE through referral fees
Chubb C, Sperling G, Solomon JA. "Texture interactions determine perceived contrast." Proc Natl Acad Sci U S A. 1989 Dec;86(23):9631-5. PMID 2594791.
External Links
Credits
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