Temporal determinants of spatial sine-wave masking

A temporal forced-choice procedure was used to measure the contrast threshold for a sinusoidal test grating (spatial frequency - f) superimposed upon a sinusoidal background or masking grating (spatial frequency = 3f). The spatial contrast of the background grating was varied, and threshold measurements were made at each of a number of background contrasts to describe a threshold versus masking contrast (tvc) function. Tvc functions were obtained when the background and test grating contrasts were, independently of each other, held steady (0 Hz) or modulated at 5 Hz. The changes of temporal modulation frequency affected the slopes of the tvc functions. In some cases the tve functions for steady and flickering test gratings crossed one another. The changes of slope suggest, and the crossovers imply, that some steady and flickering patterns are detected by separate visual mechanisms.

[1]  C. A. Burbeck.  Criterion-free pattern and flicker thresholds. , 1981, Journal of the Optical Society of America.

[2]  J. Kulikowski,et al.  Effect of eye movements on the contrast sensitivity of spatio-temporal patterns. , 1971, Vision research.

[3]  J. Robson.  Spatial and Temporal Contrast-Sensitivity Functions of the Visual System , 1966 .

[4]  Visual effects of sinusoidal components of complex gratings: independent or additive? , 1973, Vision research.

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

[6]  A. Gorea.  Directional and nondirectional coding of a spatio-temporal modulated stimulus , 1979, Vision Research.

[7]  C. A. Burbeck,et al.  Contrast gain measurements and the transient/sustained. , 1981, Journal of the Optical Society of America.

[8]  R. Shapley,et al.  Linear and nonlinear spatial subunits in Y cat retinal ganglion cells. , 1976, The Journal of physiology.

[9]  G. Legge.  A power law for contrast discrimination , 1981, Vision Research.

[10]  Bruno Breitmeyer,et al.  The role of on and off transients in determining the psychophysical spatial frequency response , 1975, Vision Research.

[11]  Allan Pantle,et al.  Visual Information Processing of Complex Imagery. , 1974 .

[12]  U. T. Keesey.  Flicker and pattern detection: a comparison of thresholds. , 1972, Journal of the Optical Society of America.

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

[14]  On the separability of two mechanisms involved in the detection of grating patterns in humans. , 1979, The Journal of physiology.

[15]  Brian J. Murphy,et al.  Summation and discrimination of gratings moving in opposite directions , 1980, Vision Research.

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

[17]  D. Tolhurst,et al.  Reaction times in the detection of gratings by human observers: A probabilistic mechanism , 1975, Vision Research.

[18]  J. Nachmias,et al.  Perceived direction of motion under retinal image stabilization , 1981, Vision Research.

[19]  D. Tolhurst,et al.  Psychophysical evidence for sustained and transient detectors in human vision , 1973, The Journal of physiology.

[20]  J. Kulikowski,et al.  Pattern and flicker detection analysed by subthreshold summation. , 1975, The Journal of physiology.

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

[22]  J P Thomas,et al.  Detection and discrimination of simple and complex patterns at low spatial frequencies , 1977, Vision Research.

[23]  Andrew M. Derrington,et al.  Pattern discrimination with flickering stimuli , 1981, Vision Research.

[24]  Bruno Breitmeyer,et al.  Flicker masking in spatial vision , 1981, Vision Research.

[25]  Marc Green.  Spatial frequency effects in masking by light , 1981, Vision Research.

[26]  S. Klein,et al.  Response of visual mechanisms to stimulus onsets and offsets. , 1979, Journal of the Optical Society of America.

[27]  M. A. Bouman,et al.  Spatiotemporal modulation transfer in the human eye. , 1967, Journal of the Optical Society of America.

[28]  P Lennie,et al.  Perceptual signs of parallel pathways. , 1980, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[29]  W. Levick,et al.  Sustained and transient neurones in the cat's retina and lateral geniculate nucleus , 1971, The Journal of physiology.

[30]  P. Lennie.  Parallel visual pathways: A review , 1980, Vision Research.

[31]  C. Enroth-Cugell,et al.  The contrast sensitivity of retinal ganglion cells of the cat , 1966, The Journal of physiology.