A new visual illusion of aspect-ratio context.

A new visual illusion of aspect-ratio context.
Vision Res. 2019 Oct 31;165:80-83
Authors: Dickinson JE, Green RJ, Harkin GM, Tang MF, Badcock DR
Abstract
Perception of local properties of the visual field is influenced by aftereffects of adaptation. The tilt aftereffect describes repulsion of the perceived orientation of a line from the orientation of an adapting line. Analogous effects of spatial context are often called illusions. Repulsion of the perceived orientation of a grating from the orientation of a surrounding grating is referred to as the tilt illusion. In the same manner, the size aftereffect and Ebbinghaus illusion form a complementary pair of temporal and spatial context effects of size. Here we report psychophysical evidence for a previously unknown aspect-ratio illusion which causes the perceived aspect-ratio of a rectangle to be repelled from the aspect-ratio of rectangles surrounding it. This illusion provides a spatial analogue to the aspect-ratio aftereffect.
PMID: 31678618 [PubMed - as supplied by publisher]

Source: Vision Research - October 30, 2019 Category: Opthalmology Authors: Dickinson JE, Green RJ, Harkin GM, Tang MF, Badcock DR Tags: Vision Res Source Type: research