title: Differences in the effects of crowding on size perception and grip scaling in densely cluttered 3-D scenes.
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.
authors.affiliation: The Brain and Mind Institute, University of Western Ontario.
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.affiliation: The Brain and Mind Institute, University of Western Ontario The School of Psychology, University of East Anglia.
authors.forename: Irene
authors.initials: I
authors.lastname: Sperandio
authors.affiliation: The Brain and Mind Institute, University of Western Ontario mgoodale@uwo.ca jchen737@uwo.ca.
authors.forename: Melvyn Alan
authors.initials: MA
authors.lastname: Goodale
mesh_terms: D000293:Adolescent; D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011597:Psychomotor Performance / Q000502:physiology*; D012858:Size Perception / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
keywords: cluttered scenes; crowding; grasping; open data; radial-tangential anisotropy; size perception; unconsciousness; visual periphery