Title: Component processes in contour integration: A direct comparison between snakes and ladders in a detection and a shape discrimination task
Authors: Vancleef, Kathleen ×
Wagemans, Johan #
Issue Date: 2013
Publisher: Elsevier
Series Title: Vision Research vol:92 pages:39-46
Abstract: In contour integration, a relevant question is whether snakes and ladders are processed similarly. Higher
presentation time thresholds for ladders in detection tasks indicate this is not the case. However, in a detection task only processing differences at the level of element linking and possibly contour localization might be picked up, while differences at the shape encoding level cannot be noticed. In this study,we make a direct comparison of detection and shape discrimination tasks to investigate if processing differences in the visual system between snakes and ladders are limited to contour detection or extend to higher level contour processing, like shape encoding. Stimuli consisted of elements that were oriented collinearly (snakes) or orthogonally (ladders) to the contour path and were urrounded by randomly oriented background elements. In two tasks, six experienced subjects either detected the contour when presented with a contour and a completely random stimulus or performed a shape discrimination task when
presented with two contours with different curvature. Presentation time was varied in 9 steps between 8 and 492 ms. By applying a generalized linear mixed model we found that differences in snake and ladder processing are not limited to a detection stage but are also apparent at a shape encoding stage.
ISSN: 0042-6989
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Experimental Psychology
Movement Control & Neuroplasticity Research Group
× corresponding author
# (joint) last author

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