Adamian, N, Anstis, S and Cavanagh, P (2023) Motion-induced distortion of shape. Journal of Vision, 23 (12). pp. 1-7.

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Abstract

Motion, position, and form are intricately intertwined in perception. Motion distorts visual space, resulting in illusory position shifts such as flash-drag and flash-grab effects. The flash-grab displaces a test by up to several times its size. This lets us use it to investigate where the motion-induced shift operates in the processing stream from photoreceptor activation to feature activation to object recognition. We present several canonical, highly familiar forms and ask whether the motion-induced shift operates uniformly across the form. If it did, we could conclude that the effect occurred after the elements of the form are bound. However, we find that motion-induced distortion affects not only the position, but also the appearance of briefly presented, canonical shapes (square, circle, and letter T). Features of the flashed target that were closest to its center were shifted in the direction of motion more than those further from its center. Outline shapes were affected more than filled shapes, and the strength of the distortion increased with the contrast of the moving background. This not only supports a nonuniform spatial profile for the motion-induced shift but also indicates that the shift operates before the shape is established, even for highly familiar shapes like squares, circles, and letters.

Item Type:	Article
Uncontrolled Keywords:	Humans; Illusions; Visual Perception; Motion; Humans; Illusions; Motion; Visual Perception; 11 Medical and Health Sciences; 17 Psychology and Cognitive Sciences; Experimental Psychology
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Divisions:	Psychology (from Sep 2019)
Publisher:	Association for Research in Vision and Ophthalmology (ARVO)
SWORD Depositor:	A Symplectic
Date Deposited:	30 Jul 2024 11:32
Last Modified:	30 Jul 2024 11:45
DOI or ID number:	10.1167/jov.23.12.10
URI:	https://researchonline.ljmu.ac.uk/id/eprint/23815

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