Interrelations between the Oppel-Kundt- and the T-illusion. (July 2022)

• Record Type: Journal Article
• Authors: Landwehr, Klaus
• Is Part Of: Perception. Volume 51:Number 7(2022)
• Page Start: 496
• Page End: 504
• Publication Date: 2022-07
• Subjects: visual illusions -- symmetry -- texture -- neural mechanisms; Perception -- Periodicals; Perception -- Periodicals; Perception; Periodicals; 153.705
• DOI: 10.1177/03010066221096998
• Languages: English
• ISSNs: 0301-0066

Abstract

In order to investigate interrelations between the Oppel-Kundt- and the T-illusion, T-type figures, comprised of one dotted and one empty line (demarcated by its endpoints), separated by a gap of variable size, and rotated to oblique orientations, were judged with regard to the lengths of the two extents. The T-illusion (overestimation of the length of the undivided line) was greater for a T with a dotted undivided line and a small gap. When the divided line was dotted, the illusion vanished at a small gap and reversed at a larger one. Findings are interpreted to mirror activities of a neural T-schema as well as orientation- and density-sensitive neurons.