Difference of Shape Constancy in Upper and Lower Visual Fields

  • Takahiro Yamanoi
  • Kazuya Kubo
  • Hiroshi Takayanagi
Chapter

Abstract

Functions of human vision have been developed to adapt to ecological restrictions. Especially, the position in early vision is neurophysiologically different between objects in the upper visual field (UVF) and in the lower visual field (LVF). In recent years, we have studied the relationship between shape constancy and eye movement. In this study, we investigate differences of shape constancy in the UVF and in the LVF.

We performed psychophysical experiments using three types of boards (circle, square and lozenge: square turned 45 deg.) as comparison stimuli and graphic patterns on a CRT as standard stimuli. The perspective shape was displayed on the CRT as if it was inclined at angles of 10, 25, 35, 45, 55, 65 and 80 deg, respectively. Subjects were asked to actually make the shape equal to the pattern on the CRT.

The results of the test determined by the difference between two mean values show a difference at a significance level of 2.5% between the UVF and the LVF. Subjects exhibited the tendency to look at the upper end of the stimulus in case of the UVF but not in the case of the LVF.

Keywords

Comparison Stimulus Standard Stimulus Graphic Pattern Psychophysical Experiment Early Vision 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Holmes G (1945) The organization of visual cortex in man. Proc Royal Soc B132: 348–361CrossRefGoogle Scholar
  2. Previc FH (1990) Functional specialization in the lower and upper visual fields in humans: Its ecological origins and neurophysiological implications. Behav Brain Res 13: 519–575Google Scholar
  3. Thouless Rh (1931) Phenomenal regression to the real object I. Brit J Psychol 21: 339–359Google Scholar

Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Takahiro Yamanoi
    • 1
  • Kazuya Kubo
    • 1
  • Hiroshi Takayanagi
    • 1
  1. 1.Department of Electronics and Information Engineering, Faculty of EngineeringHokkai Gakuen UniversitySapporoJapan

Personalised recommendations