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Saccadic Compression of Rectangle and Kanizsa Figures: Now You See It, Now You Don't

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  • Atsushi Noritake
  • Bob Uttl
  • Masahiko Terao
  • Masayoshi Nagai
  • Junji Watanabe
  • Akihiro Yagi

Abstract

Background: Observers misperceive the location of points within a scene as compressed towards the goal of a saccade. However, recent studies suggest that saccadic compression does not occur for discrete elements such as dots when they are perceived as unified objects like a rectangle. Methodology/Principal Findings: We investigated the magnitude of horizontal vs. vertical compression for Kanizsa figure (a collection of discrete elements unified into single perceptual objects by illusory contours) and control rectangle figures. Participants were presented with Kanizsa and control figures and had to decide whether the horizontal or vertical length of stimulus was longer using the two-alternative force choice method. Our findings show that large but not small Kanizsa figures are perceived as compressed, that such compression is large in the horizontal dimension and small or nil in the vertical dimension. In contrast to recent findings, we found no saccadic compression for control rectangles. Conclusions: Our data suggest that compression of Kanizsa figure has been overestimated in previous research due to methodological artifacts, and highlight the importance of studying perceptual phenomena by multiple methods.

Suggested Citation

  • Atsushi Noritake & Bob Uttl & Masahiko Terao & Masayoshi Nagai & Junji Watanabe & Akihiro Yagi, 2009. "Saccadic Compression of Rectangle and Kanizsa Figures: Now You See It, Now You Don't," PLOS ONE, Public Library of Science, vol. 4(7), pages 1-11, July.
    • Handle: RePEc:plo:pone00:0006383
    DOI: 10.1371/journal.pone.0006383
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    References listed on IDEAS

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    1. John Ross & M. Concetta Morrone & David C. Burr, 1997. "Compression of visual space before saccades," Nature, Nature, vol. 386(6625), pages 598-601, April.
    2. Markus Lappe & Holger Awater & Bart Krekelberg, 2000. "Postsaccadic visual references generate presaccadic compression of space," Nature, Nature, vol. 403(6772), pages 892-895, February.
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