2-D tilt and 3-D slant illusions in perception and action tasks

Paul Barry Hibbard, MF Bradshaw

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

There is now a well established dissociation between perception and action based primarily on neuropsychological evidence [Milner and Goodale, 1995 The Visual Brain in Action (Oxford: Oxford University Press)]. Although equivocal, an important source of evidence from normal observers is that 'perceptual illusions' may affect the systems differently. We investigated the relative effects of 2-D tilt and 3-D slant illusions in the two domains, using similar tasks to those employed originally by Milner and Goodale. Subjects were required to either post a card through, or set a paddle to match the orientation of, a plane that was presented in two conditions: surrounded by a striped surface tilted between +90 degrees and -90 degrees (2-D tilt contrast), or surrounded by a disparity defined surface slanted in depth between +60 degrees and -60 degrees (3-D depth contrast). For 2-D tilt, action and perception were equally affected by the illusion, whereas in the 3-D condition they were not. Here, the illusion appeared greater in the posting than in the perceptual task. We conclude that, although no qualitative differences exist, there were quantitative differences between perception and action tasks in the binocular condition.

Original languageEnglish
Pages (from-to)1297-1305
Number of pages9
JournalPerception
Volume35
Issue number10
DOIs
Publication statusPublished - 2006

Keywords

  • RESIST VISUAL ILLUSIONS/
  • PREHENSION MOVEMENTS
  • BINOCULAR DISPARITY
  • STEREOSCOPIC DEPTH
  • KINEMATIC ANALYSIS
  • CORTICAL AREA
  • FORM AGNOSIA
  • DISSOCIATION
  • CONTRAST
  • OBJECTS

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