Saccades reveal that allocentric coding of the moving object causes mislocalization in the flash-lag effect

Becker, Stefanie I., Ansorge, Ulrich and Turatto, Massimo (2009) Saccades reveal that allocentric coding of the moving object causes mislocalization in the flash-lag effect. Attention, Perception & Psychophysics, 71 6: 1313-1324. doi:10.3758/APP.71.6.1313


Author Becker, Stefanie I.
Ansorge, Ulrich
Turatto, Massimo
Title Saccades reveal that allocentric coding of the moving object causes mislocalization in the flash-lag effect
Journal name Attention, Perception & Psychophysics   Check publisher's open access policy
ISSN 1943-3921
Publication date 2009-08
Year available 2009
Sub-type Article (original research)
DOI 10.3758/APP.71.6.1313
Volume 71
Issue 6
Start page 1313
End page 1324
Total pages 12
Editor Jeremy M Wolfe
Place of publication United States
Publisher Psychonomic Society, Inc.
Collection year 2010
Language eng
Subject C1
1701 Psychology
1702 Cognitive Sciences
970117 Expanding Knowledge in Psychology and Cognitive Sciences
Abstract The flash-lag effect is a visual misperception of a position of a flash relative to that of a moving object: Even when both are at the same position, the flash is reported to lag behind the moving object. In the present study, the flash-lag effect was investigated with eye-movement measurements: Subjects were required to saccade to either the flash or the moving object. The results showed that saccades to the flash were precise, whereas saccades to the moving object showed an offset in the direction of motion. A further experiment revealed that this offset in the saccades to the moving object was eliminated when the whole background flashed. This result indicates that saccadic offsets to the moving stimulus critically depend on the spatially distinctive flash in the vicinity of the moving object. The results are incompatible with current theoretical explanations of the flash-lag effect, such as the motion extrapolation account. We propose that allocentric coding of the position of the moving object could account for the flash-lag effect.
Keyword RESIST VISUAL ILLUSIONS
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Psychology Publications
 
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Created: Thu, 03 Sep 2009, 07:46:34 EST by Mr Andrew Martlew on behalf of School of Psychology