Visual sensitivity can scale with illusory size changes

Schindel, Ryan and Arnold, Derek H. (2010) Visual sensitivity can scale with illusory size changes. Current Biology, 20 9: 841-844. doi:10.1016/j.cub.2010.02.068

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Author Schindel, Ryan
Arnold, Derek H.
Title Visual sensitivity can scale with illusory size changes
Journal name Current Biology   Check publisher's open access policy
ISSN 0960-9822
1879-0445
Publication date 2010-05-11
Sub-type Article (original research)
DOI 10.1016/j.cub.2010.02.068
Volume 20
Issue 9
Start page 841
End page 844
Total pages 4
Editor Geoffrey North
Place of publication Cambridge, Mass
Publisher Cell Press
Collection year 2011
Language eng
Subject 0601 Biochemistry and Cell Biology
C1
Abstract Retinal image size is not the sole determinant of the apparent size of objects. Rather, viewing distance is taken into account when determining apparent size [1–3], so images of the same physical dimensions can appear to represent different-sized objects. Here, we take advantage of this to examine the relationship between visual sensitivity and the scaling processes involved in determining apparent size. We assess the impact of illusory size changes, induced by apparent viewing distance changes, on judgments concerning clearly visible stimuli and on the ability to detect low contrast inputs. We find that sensitivity to slight orientation changes between successive and clearly visible stimuli can scale with illusory size changes. However, illusory size changes have no discernible impact on the ability to detect low-contrast inputs. When considered in conjunction with recent brain imaging studies [4–6], our data suggest that visual sensitivity is linked to the spread of activity across primary visual cortex, which for clearly visible stimuli is shaped by the scaling processes involved in the determination of apparent size.
Keyword SYSNEURO
Contrast sensitivity
Spatial-frequency
Viewing distance
Surface orientation
Cortex
Representation
Accommodation
Visibility
Dependence
Gradient
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Listed publication date (11 May 2010) is the date published in print; published/available online 29 April 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Psychology Publications
 
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Created: Tue, 05 Oct 2010, 13:59:30 EST by Dr Derek Arnold on behalf of School of Psychology