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.
This is a preview of subscription content, log in to check access.
Andrews, D.P. (1967). Perception of contour orientation in the central fovea. Part I: short lines. Vision Research, 7, 975–997.PubMedGoogle Scholar
Appelle, S.(1972). Perception and discrimination as a function of stimulus orientation: the “oblique effect” in man and animals. Psychological Bulletin, 78, 266–278.PubMedGoogle Scholar
Blakemore, C. & Campbell, F.W. (1969). On the existence of neurones in the human visual system selectively sensitive to the orientation and size of retinal images. Journal of Physiology, 203, 237–260.PubMedGoogle Scholar
Blakemore, C. & Cooper, G.F.(1970). Development of the brain depends on the visual environment.Nature, 228, 477–478.PubMedGoogle Scholar
Campbell, F.W., Kulikowski, J.J. & Levinson, J. (1966). The effect of orientation on the visual resolution of gratings. Journal of Physiology, 187, 427–436.PubMedGoogle Scholar
Campbell, F.W., Maffei, L. & Piccolino, M. (1973). The contrast sensitivity of the cat. Journal of Physiology, 229, 719–731.PubMedGoogle Scholar
Essock, E.A. (1990). The influence of stimulus length on the oblique effect of contrast sensitivity. Vision Research, 30, 1243–1246.PubMedGoogle Scholar
Heeley, D.W. & Timney, B. (1989). Spatial frequency discriminations at different orientations. Vision Research, 29, 1221–1228.PubMedGoogle Scholar
Hirsch, J. & Hylton, R. (1984). Orientation dependence of hiperacuity contains a component with hexagonal symmetry. Journal of the Optical Society of America, A, 1, 300–308.Google Scholar
Hubel, D.H. & Wiesel, T.N. (1962) Receptive fields, binocular interaction and functional architecture in the cat's visual cortex. Journal of Physiology, 160, 106–154.PubMedGoogle Scholar
Maffei, L. & Campbell, F.W. (1970). Neurophysiological localization of the vertical and horizontal coordinates in man. Science, 167, 386–387.PubMedGoogle Scholar
Mansfield, R.J.W. (1974). Neural basis of orientation perception in primate vision. Science, 186, 1133–1135.PubMedGoogle Scholar