Masking by Uniform Field Flicker: Some Practical Problems

The technique of uniform field flicker (UFF) masking has frequently been used to address issues concerning the relative performance of sustained and transient neural channels in the human visual system. Unfortunately there has been an artifact in the implementation of this method in most published experiments which has meant that the contrast of the target has been flickered in synchrony with the mean luminance. A study is reported in which the artifact was corrected and the effects of UFF masking on the contrast sensitivity function then examined. With this correction, masking was still restricted to low spatial frequencies but it was much weaker than reported originally. It is argued that the original evidence suggesting that UFF masking can be used to examine the functioning of transient and sustained channels has not been interpreted correctly and that the basis for such a claim is weak.

[1]  B. Breitmeyer,et al.  Temporal studies with flashed gratings: Inferences about human transient and sustained channels , 1977, Vision Research.

[2]  D. Tolhurst.  Sustained and transient channels in human vision , 1975, Vision Research.

[3]  F. Martin,et al.  Flicker Contrast Sensitivity in Normal and Specifically Disabled Readers , 1987, Perception.

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

[5]  A Bowling,et al.  The effects of the contrast, spatial frequency, and temporal frequency of a surrounding field upon the detection thresholds of gratings , 1985, Perception & psychophysics.

[6]  J. Nachmias.  Effect of Exposure Duration on Visual Contrast Sensitivity with Square-Wave Gratings*† , 1967 .

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

[8]  A. Gorea,et al.  New look at Bloch's law for contrast. , 1986, Journal of the Optical Society of America. A, Optics and image science.

[9]  B G Breitmeyer,et al.  Implications of sustained and transient channels for theories of visual pattern masking, saccadic suppression, and information processing. , 1976, Psychological review.

[10]  T K Goldstick,et al.  The contrast sensitivity of cat retinal ganglion cells at reduced oxygen tensions. , 1980, The Journal of physiology.

[11]  D. Raab,et al.  Reaction time to stimuli masked by metacontrast. , 1962, Journal of experimental psychology.

[12]  A. T. Smith,et al.  Flicker Masking and Developmental Dyslexia , 1986, Perception.

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

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

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

[16]  A. Bowling,et al.  The effects of peripheral movement and flicker on the detection thresholds of sinusoidal gratings , 1985, Perception & psychophysics.

[17]  Mark A. Georgeson,et al.  Temporal properties of spatial contrast vision , 1987, Vision Research.

[18]  W. Lovegrove,et al.  The effect of stimulus duration on the persistence of gratings , 1980, Perception & psychophysics.

[19]  Marc Green,et al.  Masking by light and the sustained-transient dichotomy , 1984, Perception & psychophysics.

[20]  Gerald Westheimer.  The oscilloscopic view: Retinal illuminance and contrast of point and line targets , 1985, Vision Research.

[21]  O. Schade.  Optical and photoelectric analog of the eye. , 1956, Journal of the Optical Society of America.

[22]  D M Levi,et al.  Psychophysical mechanisms in humans with amblyopia. , 1982, American journal of optometry and physiological optics.

[23]  W. Lovegrove,et al.  Flicker Masking of Spatial-Frequency-Dependent Visible Persistence and Specific Reading Disability , 1984, Perception.

[24]  F. Martin,et al.  A theoretical and experimental case for a visual deficit in specific reading disability , 1986 .

[25]  Gordon E. Legge,et al.  Light and dark bars; contrast discrimination , 1983, Vision Research.