An inverse oblique effect in human vision

In the classic oblique effect contrast detection thresholds, orientation discrimination thresholds, and other psychophysical measures are found to be smallest for vertical or horizontal stimuli and significantly higher for stimuli near the +/-45 degrees obliques. Here we report a novel inverse oblique effect in which thresholds for detecting translational structure in random dot patterns [Glass, L. (1969). Moiré effect from random dots. Nature, 223, 578-580] are lowest for obliquely oriented structure and higher for either horizontal or vertical structure. Area summation experiments provide evidence that this results from larger pooling areas for oblique orientations in these patterns. The results can be explained quantitatively by a model for complex cells in which the final filtering stage in a filter-rectify-filter sequence is of significantly larger area for oblique orientations.

[1]  R. Mansfield,et al.  Neural Basis of Orientation Perception in Primate Vision , 1974, Science.

[2]  D. Fitzpatrick,et al.  Unequal representation of cardinal and oblique contours in ferret visual cortex. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[3]  R. Pérez,et al.  Perception of Random Dot Interference Patterns , 1973, Nature.

[4]  D. Burr,et al.  Two stages of visual processing for radial and circular motion , 1995, Nature.

[5]  H. Wilson,et al.  Concentric orientation summation in human form vision , 1997, Vision Research.

[6]  C. Furmanski,et al.  An oblique effect in human primary visual cortex , 2000, Nature Neuroscience.

[7]  J. Jastrow.  Studies from the University of Wisconsin: On the Judgment of Angles and Positions of Lines , 1892 .

[8]  S. Appelle.  Perception and discrimination as a function of stimulus orientation: the "oblique effect" in man and animals. , 1972, Psychological bulletin.

[9]  H. Wilson,et al.  Detection of global structure in Glass patterns: implications for form vision , 1998, Vision Research.

[10]  B. C. Motter,et al.  Responses of neurons in visual cortex (V1 and V2) of the alert macaque to dynamic random-dot stereograms , 1985, Vision Research.

[11]  Quick Rf.  A vector-magnitude model of contrast detection. , 1974 .

[12]  Hugh R. Wilson,et al.  Contrast matching data predicted from contrast increment thresholds , 1984, Vision Research.

[13]  L. Glass.  Moiré Effect from Random Dots , 1969, Nature.

[14]  G. Orban,et al.  Human perceptual learning in identifying the oblique orientation: retinotopy, orientation specificity and monocularity. , 1995, The Journal of physiology.

[15]  W. Weibull.  A Statistical Distribution Function of Wide Applicability , 1951 .

[16]  D. W. Heeley,et al.  Meridional anisotropies of orientation discrimination for sine wave gratings , 1988, Vision Research.

[17]  J. Movshon,et al.  Receptive field organization of complex cells in the cat's striate cortex. , 1978, The Journal of physiology.

[18]  T. Bonhoeffer,et al.  Overrepresentation of horizontal and vertical orientation preferences in developing ferret area 17. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[19]  VARIATION OF VISUAL ACUITY WITH VARIOUS TEST-OBJECT ORIENTATIONS AND VIEWING CONDITIONS , 1950 .