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Differences in the Effects of Crowding on Size Perception and Grip Scaling in Densely Cluttered 3-D Scenes

Differences in the Effects of Crowding on Size Perception and Grip Scaling in Densely Cluttered... Objects rarely appear in isolation in natural scenes. Although many studies have investigated how nearby objects influence perception in cluttered scenes (i.e., crowding), none has studied how nearby objects influence visually guided action. In Experiment 1, we found that participants could scale their grasp to the size of a crowded target even when they could not perceive its size, demonstrating for the first time that neurologically intact participants can use visual information that is not available to conscious report to scale their grasp to real objects in real scenes. In Experiments 2 and 3, we found that changing the eccentricity of the display and the orientation of the flankers had no effect on grasping but strongly affected perception. The differential effects of eccentricity and flanker orientation on perception and grasping show that the known differences in retinotopy between the ventral and dorsal streams are reflected in the way in which people deal with targets in cluttered scenes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Psychological Science SAGE

Differences in the Effects of Crowding on Size Perception and Grip Scaling in Densely Cluttered 3-D Scenes

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References (40)

Publisher
SAGE
Copyright
© The Author(s) 2014
ISSN
0956-7976
eISSN
1467-9280
DOI
10.1177/0956797614556776
pmid
25479759
Publisher site
See Article on Publisher Site

Abstract

Objects rarely appear in isolation in natural scenes. Although many studies have investigated how nearby objects influence perception in cluttered scenes (i.e., crowding), none has studied how nearby objects influence visually guided action. In Experiment 1, we found that participants could scale their grasp to the size of a crowded target even when they could not perceive its size, demonstrating for the first time that neurologically intact participants can use visual information that is not available to conscious report to scale their grasp to real objects in real scenes. In Experiments 2 and 3, we found that changing the eccentricity of the display and the orientation of the flankers had no effect on grasping but strongly affected perception. The differential effects of eccentricity and flanker orientation on perception and grasping show that the known differences in retinotopy between the ventral and dorsal streams are reflected in the way in which people deal with targets in cluttered scenes.

Journal

Psychological Science – SAGE

Published: Jan 1, 2015

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