Contrast masking in human vision.

Contrast masking was studied psychophysically. A two-alternative forced-choice procedure was used to measure contrast thresholds for 2.0 cpd sine-wave gratings in the presence of masking sine-wave gratings. Thresholds were measured for 11 masker contrasts spanning three log units, and seven masker frequencies ranging +/- one octave from the signal frequency. Corresponding measurements were made for gratings with horizontal widths of 0.75 degrees (narrow fields) and 6.0 degrees (wide fields). For high contrast maskers at all frequencies, signal thresholds were related to masking contrast by power functions with exponents near 0.6. For a range of low masking contrasts, signal thresholds were reduced by the masker. For the wide fields, high contrast masking tuning functions peaked at the signal frequency, were slightly asymmetric, and had approximately invariant half-maximum frequencies that lie 3/4 octave below and 1 octave above the signal frequency. The corresponding low contrast tuning functions exhibited peak threshold reduction at the signal frequency, with half-minimum frequencies at roughly +/- 0.25 octaves. For the narrow fields, the masking tuning functions were much broader at both low and high masking contrasts. A masking model is presented that encompasses contrast detection, discrimination, and masking phenomena. Central constructs of the model include a linear spatial frequency filter, a nonlinear transducer, and a process of spatial pooling that acts at low contrasts only.

[1]  J. Thomas.  Model of the function of receptive fields in human vision. , 1970, Psychological review.

[2]  J. Nachmias,et al.  Discrimination of simple and complex gratings , 1975, Vision Research.

[3]  J. Nachmias,et al.  Visual detection and discrimination of luminance increments. , 1970, Journal of the Optical Society of America.

[4]  J. Kulikowski,et al.  Spatial arrangement of line, edge and grating detectors revealed by subthreshold summation. , 1973, Vision research.

[5]  S. Klein,et al.  Spatial frequency channels in human vision as asymmetric (edge) mechanisms. , 1974, Vision research.

[6]  J. Kulikowski,et al.  Electrophysiological and Psychophysical Responses to Modulation of Contrast of a Grating Pattern , 1972, Perception.

[7]  J. M. Foley,et al.  Contrast detection and near-threshold discrimination in human vision , 1981, Vision Research.

[8]  D. Tolhurst,et al.  Is spatial adaptation an after‐effect of prolonged inhibition? , 1974, The Journal of physiology.

[9]  S. Klein,et al.  Evidence against narrow-band spatial frequency channels in human vision: the detectability of frequency modulated gratings , 1975, Vision Research.

[10]  D. Tolhurst.  Adaptation to square‐wave gratings: inhibition between spatial frequency channels in the human visual system , 1972, The Journal of physiology.

[11]  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.

[12]  D. Tolhurst,et al.  Interactions between spatial frequency channels , 1978, Vision Research.

[13]  Bernice E. Rogowitz,et al.  Spatial pooling properties deduced from the detectability of FM and quasi-AM gratings: A reanalysis , 1976, Vision Research.

[14]  D. Green.  An introduction to hearing , 1976 .

[15]  D. J. Sakrison,et al.  Structure and properties of a single channel in the human visual system , 1976, Vision Research.

[16]  D. Tolhurst.  Separate channels for the analysis of the shape and the movement of a moving visual stimulus , 1973, The Journal of physiology.

[17]  H. Wilson,et al.  Threshold visibility of frequency gradient patterns , 1977, Vision Research.

[18]  G. Legge.  Space domain properties of a spatial frequency channel in human vision , 1978, Vision Research.

[19]  F. Campbell,et al.  Visibility of aperiodic patterns compared with that of sinusoidal gratings , 1969, The Journal of physiology.

[20]  G. Legge.  Spatial frequency masking in human vision: binocular interactions. , 1979, Journal of the Optical Society of America.

[21]  F. Campbell,et al.  Orientational selectivity of the human visual system , 1966, The Journal of physiology.

[22]  H. Wilson.  Quantitative characterization of two types of line-spread function near the fovea , 1978, Vision Research.

[23]  K. D. Valois.  Spatial frequency adaptation can enhance contrast sensitivity , 1977, Vision Research.

[24]  R Hilz,et al.  Functional organization of the peripheral retina: sensitivity to periodic stimuli. , 1974, Vision research.

[25]  T. Reichert,et al.  Spatial-frequency selectivity in contrast detection , 1975, Vision Research.

[26]  R. Röhler,et al.  Untersuchung der Subjektiven Detailerkennbarkeit mit Hilfe der Ortsfrequenzfilterung , 1970 .

[27]  F A Bilsen,et al.  The influence of the number of cycles upon the visual contrast threshold for spatial sine wave patterns. , 1974, Vision research.

[28]  G. Mowbray,et al.  Visual Masking , 1964, Nature.

[29]  H. Wilson.  Quantitative prediction of line spread function measurements: Implications for channel bandwidths , 1978, Vision Research.

[30]  G. Legge.  Sustained and transient mechanisms in human vision: Temporal and spatial properties , 1978, Vision Research.

[31]  B. Julesz,et al.  Spatial-frequency masking in vision: critical bands and spread of masking. , 1972, Journal of the Optical Society of America.

[32]  K. D. De Valois,et al.  Spatial frequency adaptation can enhance contrast sensitivity. , 1977, Vision research.

[33]  J. Robson,et al.  Spatial-frequency channels in human vision. , 1971, Journal of the Optical Society of America.

[34]  Michael L. Hines.  Line spread function variation near the fovea , 1976, Vision Research.

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

[36]  W. J. McGill,et al.  A study of the near-miss involving Weber’s law and pure-tone intensity discrimination , 1968 .

[37]  A Pantle,et al.  Size-Detecting Mechanisms in Human Vision , 1968, Science.

[38]  D. G. Green,et al.  Optical and retinal factors affecting visual resolution. , 1965, The Journal of physiology.

[39]  J. Kulikowski,et al.  Complete adaptation to patterned stimuli: A necessary and sufficient condition for Weber's law for contrast , 1978, Vision Research.

[40]  M. A. Bouman,et al.  Perimetry of contrast detection thresholds of moving spatial sine wave patterns. I. The near peripheral visual field (eccentricity 0 degrees-8 degrees). , 1978, Journal of the Optical Society of America.

[41]  T. Reichert,et al.  Spatial summation effects on two-component grating thresholds. , 1978, Journal of the Optical Society of America.

[42]  J. Bergen,et al.  A four mechanism model for threshold spatial vision , 1979, Vision Research.

[43]  L. Thibos,et al.  Detectability of a luminance increment. , 1974, Journal of the Optical Society of America.

[44]  J. McCann,et al.  Visibility of low-spatial-frequency sine-wave targets: Dependence on number of cycles. , 1975, Journal of the Optical Society of America.

[45]  I. D. Macleod,et al.  The visibility of gratings: spatial frequency channels or bar-detecting units? , 1974, Vision research.

[46]  N. Graham.  Visual detection of aperiodic spatial stimuli by probability summation among narrowband channels , 1977, Vision Research.

[47]  J. Kulikowski,et al.  Effective contrast constancy and linearity of contrast sensation , 1976, Vision Research.

[48]  C. Blakemore,et al.  Stimulus specificity in the human visual system. , 1973, Vision research.

[49]  M. Sanders.  Handbook of Sensory Physiology , 1975 .

[50]  J. McCann,et al.  Visibility of low-frequency sine-wave targets: Dependence on number of cycles and surround parameters , 1978, Vision Research.

[51]  G. J. Burton,et al.  Evidence for non-linear response processes in the human visual system from measurements on the thresholds of spatial beat frequencies. , 1973, Vision research.

[52]  J Nachmias,et al.  Letter: Grating contrast: discrimination may be better than detection. , 1974, Vision research.

[53]  J. Robson,et al.  Application of fourier analysis to the visibility of gratings , 1968, The Journal of physiology.

[54]  P E King-Smith,et al.  The detection of gratings by independent activation of line detectors. , 1975, The Journal of physiology.

[55]  C. R. Cavonius,et al.  Low-frequency attenuation in the detection of gratings: Sorting out the artefacts , 1976, Vision Research.

[56]  Detection threshold for a two‐tone complex , 1974 .

[57]  S. Klein,et al.  Is spatial adaptation caused by prolonged inhibition? , 1977, Vision Research.

[58]  G. B. Wetherill,et al.  SEQUENTIAL ESTIMATION OF POINTS ON A PSYCHOMETRIC FUNCTION. , 1965, The British journal of mathematical and statistical psychology.