Visual Search: Spatial Frequency and Orientation

Observers searched for a Gaussian-windowed patch of sinewave grating (Gabor pattern) through displays containing varying numbers of other such patterns (distractors). When the spatial frequencies of target and distractors differed by ± 2 octaves and their orientations by ± 60°, the search proceeded spatially in parallel irrespective of whether the target could be discriminated in terms of spatial frequency differences alone, orientation differences alone, or their combination. However, when target and distractors differed by only ±.5 octave in spatial frequency and by ± 15° in orientation, the search was serial and self-terminating, again irrespective of the nature of the target-distractor differences. These findings show that, contrary to some suggestions, the preattentive detection of targets defined by conjunctions of spatial frequency and orientation may occur, but only when the spectral distance between target and distractors allows their encoding by independent mechanisms.

[1]  U. Neisser.  Decision-time without reaction-time: Experiments in visual scanning. , 1963 .

[2]  C Blakemore,et al.  On the existence of neurones in the human visual system selectively sensitive to the orientation and size of retinal images , 1969, The Journal of physiology.

[3]  C. Blakemore,et al.  The orientation specificity of two visual after‐effects , 1971, The Journal of physiology.

[4]  P. O. Bishop,et al.  Spatial vision. , 1971, Annual review of psychology.

[5]  M. Georgeson,et al.  Contrast constancy: deblurring in human vision by spatial frequency channels. , 1975, The Journal of physiology.

[6]  P. Schiller,et al.  Quantitative studies of single-cell properties in monkey striate cortex. III. Spatial frequency. , 1976, Journal of neurophysiology.

[7]  O. Mitchell.  Effect of spatial frequency on the visibility of unstructured patterns. , 1976, Journal of the Optical Society of America.

[8]  P. Schiller,et al.  Quantitative studies of single-cell properties in monkey striate cortex. II. Orientation specificity and ocular dominance. , 1976, Journal of neurophysiology.

[9]  D. H. Kelly.  Pattern detection and the two-dimensional Fourier transform: Flickering checkerboards and chromatic mechanisms , 1976, Vision Research.

[10]  N. Weisstein,et al.  Contrast reduction by small localized stimuli: Extensive spatial spread of above-threshold orientation-selective masking , 1977, Vision Research.

[11]  J. Daugman.  Two-dimensional spectral analysis of cortical receptive field profiles , 1980, Vision Research.

[12]  A. Treisman,et al.  A feature-integration theory of attention , 1980, Cognitive Psychology.

[13]  E. Farmer,et al.  Visual search through color displays: Effects of target-background similarity and background uniformity , 1980, Perception & psychophysics.

[14]  J. M. Foley,et al.  Contrast masking in human vision. , 1980, Journal of the Optical Society of America.

[15]  A. Fiorentini,et al.  Learning in grating waveform discrimination: Specificity for orientation and spatial frequency , 1981, Vision Research.

[16]  B. Julesz,et al.  Early visual perception. , 1981, Annual review of psychology.

[17]  R. L. Valois,et al.  The orientation and direction selectivity of cells in macaque visual cortex , 1982, Vision Research.

[18]  BELA JULESZ,et al.  Rapid discrimination of visual patterns , 1983, IEEE Transactions on Systems, Man, and Cybernetics.

[19]  H. Wilson,et al.  Spatial frequency tuning of orientation selective units estimated by oblique masking , 1983, Vision Research.

[20]  J. Daugman.  Spatial visual channels in the fourier plane , 1984, Vision Research.

[21]  H Ghandeharian,et al.  Visual signal detection. I. Ability to use phase information. , 1984, Journal of the Optical Society of America. A, Optics and image science.

[22]  R. L. de Valois,et al.  Relationship between spatial-frequency and orientation tuning of striate-cortex cells. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[23]  T Caelli,et al.  What is Perceived When Two Images are Combined? , 1985, Perception.

[24]  T. Caelli,et al.  On the detection of Gabor signals and discrimination of Gabor textures , 1985, Vision Research.

[25]  G Moraglia,et al.  On the detection of signals embedded in natural scenes , 1986, Perception & psychophysics.

[26]  T. Caelli,et al.  Is pattern masking predicted by the cross-correlation between signal and mask? , 1987, Vision Research.

[27]  A. Treisman.  Features and Objects: The Fourteenth Bartlett Memorial Lecture , 1988, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[28]  D Sagi,et al.  The combination of spatial frequency and orientation is effortlessly perceived , 1988, Perception & psychophysics.

[29]  A Treisman,et al.  Feature analysis in early vision: evidence from search asymmetries. , 1988, Psychological review.

[30]  G. Moraglia,et al.  Visual search along the colour dimension. , 1989, Canadian journal of psychology.