HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Scale-invariance in brightness illusions implicates object-level visual processing.

Abstract
Brightness illusions demonstrate that an object's perceived brightness depends on its visual context, leading to theoretical explanations ranging from simple lateral inhibition to those based on the influence of knowledge of and experience with the world. We measure the relative brightness of mid-luminance test disks embedded in gray-scale images, and show that rankings of test disk brightness are independent of viewing distance, implying that the rankings depend on the physical object size, not the size of disks subtended on the retina. A single filter that removes low spatial frequency content, adjusted to the diameters of the test disks, can account for the relative brightness of the disks. We note that the removal of low spatial frequency content is a principle common to many different approaches to brightness/lightness phenomena; furthermore, object-size representations--as opposed to retinal-size representations--inherently remove low spatial frequency content, therefore, any process that creates object representations should also produce brightness illusions.
AuthorsErica Dixon, Arthur Shapiro, Zhong-Lin Lu
JournalScientific reports (Sci Rep) Vol. 4 Pg. 3900 (Jan 29 2014) ISSN: 2045-2322 [Electronic] England
PMID24473496 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
Topics
  • Humans
  • Illusions (physiology)
  • Light
  • Photic Stimulation (methods)
  • Retina (physiology)
  • Vision, Ocular (physiology)
  • Visual Perception (physiology)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: