Luminance gradient at object borders communicates object location to the human oculomotor system

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http://hdl.handle.net/10138/237262

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Kilpeläinen , M & Georgeson , M A 2018 , ' Luminance gradient at object borders communicates object location to the human oculomotor system ' , Scientific Reports , vol. 8 , no. 1 , 1593 . https://doi.org/10.1038/s41598-018-19464-1

Title: Luminance gradient at object borders communicates object location to the human oculomotor system
Author: Kilpeläinen, Markku; Georgeson, Mark A.
Contributor: University of Helsinki, Medicum
Date: 2018-01-25
Language: eng
Number of pages: 11
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/237262
Abstract: The locations of objects in our environment constitute arguably the most important piece of information our visual system must convey to facilitate successful visually guided behaviour. However, the relevant objects are usually not point-like and do not have one unique location attribute. Relatively little is known about how the visual system represents the location of such large objects as visual processing is, both on neural and perceptual level, highly edge dominated. In this study, human observers made saccades to the centres of luminance defined squares (width 4 deg), which appeared at random locations (8 deg eccentricity). The phase structure of the square was manipulated such that the points of maximum luminance gradient at the square’s edges shifted from trial to trial. The average saccade endpoints of all subjects followed those shifts in remarkable quantitative agreement. Further experiments showed that the shifts were caused by the edge manipulations, not by changes in luminance structure near the centre of the square or outside the square. We conclude that the human visual system programs saccades to large luminance defined square objects based on edge locations derived from the points of maximum luminance gradients at the square’s edges.
Subject: 3112 Neurosciences
515 Psychology
MONKEY SUPERIOR COLLICULUS
PRIMARY VISUAL-CORTEX
EYE-MOVEMENTS
BRIGHTNESS PERCEPTION
PERIPHERAL-VISION
STRIATE CORTEX
REPRESENTATION
FIELD
ORGANIZATION
RESOLUTION
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