Differences in the effects of crowding on size perception and grip scaling in densely cluttered 3D scenes

Juan Chen (Lead Author), Irene Sperandio, Melvyn A. Goodale

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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 unconscious visual information to scale their grasp to real objects in real scenes. In Experiments 2 and 3, we showed 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.
Original languageEnglish
Pages (from-to)58-69
Number of pages12
JournalPsychological Science
Issue number1
Early online date5 Dec 2014
Publication statusPublished - Jan 2015


  • crowding
  • size perception
  • grasping
  • unconsciousness
  • visual periphery
  • cluttered scenes
  • radial-tangential anisotropy
  • open data

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