Size matters: saccades during scene perception

von Wartburg, Roman; Wurtz, Pascal; Pflugshaupt, Tobias; Nyffeler, Thomas; Lüthi, Mathias; Müri, René M (2007). Size matters: saccades during scene perception. Perception, 36(3), pp. 355-65. London: Pion 10.1068/p5552

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We investigated the effect of image size on saccade amplitudes. First, in a meta-analysis, relevant results from previous scene perception studies are summarised, suggesting the possibility of a linear relationship between mean saccade amplitude and image size. Forty-eight observers viewed 96 colour scene images scaled to four different sizes, while their eye movements were recorded. Mean and median saccade amplitudes were found to be directly proportional to image size, while the mode of the distribution lay in the range of very short saccades. However, saccade amplitudes expressed as percentages of image size were not constant over the different image sizes; on smaller stimulus images, the relative saccades were found to be larger, and vice versa. In sum, and as far as mean and median saccade amplitudes are concerned, the size of stimulus images is the dominant factor. Other factors, such as image properties, viewing task, or measurement equipment, are only of subordinate importance. Thus, the role of stimulus size has to be reconsidered, in theoretical as well as methodological terms.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology
UniBE Contributor:	von Wartburg, Roman, Wurtz, Pascal, Pflugshaupt, Tobias, Nyffeler, Thomas, Müri, René Martin
ISSN:	0301-0066
ISBN:	17455751
Publisher:	Pion
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:55
Last Modified:	05 Dec 2022 14:17
Publisher DOI:	10.1068/p5552
PubMed ID:	17455751
Web of Science ID:	000245906800004
URI:	https://boris.unibe.ch/id/eprint/23482 (FactScience: 41962)