Effects of spatial frequency and stimulus size on the orientation sensitivity of humans

  • F. Díaz-Otero
  • A. Caballero
  • A. Lorenzo
  • J. A. Sigüenza
Cognitive Science and AI
Part of the Lecture Notes in Computer Science book series (LNCS, volume 930)


Threshold for grating detection have been measured in six human observers for different orientations (vertical, horizontal, oblique 45° and oblique 135°). Gratings of fifteen different spatial frequencies were presented monocularly to the observers through a circular window. The area of the window was different under two experimental conditions (A=3.14°2 and B=0.785°2). In all cases, the sensitivity was higher for the vertical orientation than for the other ones. Moreover, the sensitivity was lower for all the orientations when the B window was used, in this case, the sensitivity for the oblique orientations was higher than the horizontal one.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • F. Díaz-Otero
    • 1
    • 2
  • A. Caballero
    • 1
    • 2
  • A. Lorenzo
    • 1
    • 2
  • J. A. Sigüenza
    • 1
    • 2
  1. 1.Instituto de Ingeniería del Conocimiento, Mód. C-XVI, P. 4Universidad Autónoma de MadridMadridSpain
  2. 2.Facultad de MedicinaUniversidad Autónoma de MadridMadridSpain

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