Comparing contrast-modulated and luminance-modulated masking: effects of spatial frequency.

Willis, Alexandra, Smallman, Harvey S and Harris, Julie M (2000) Comparing contrast-modulated and luminance-modulated masking: effects of spatial frequency. Perception: ECVP abstract supplement, 29 (1). pp. 81-100. ISSN 0301-0066

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The masking of a sinusoidal test grating by contrast-modulated (CM) gratings could, in principle, be attributable to the presence of a distortion product, injected into the stimulus during some nonlinear transformation at an early level of visual processing (eg Nachmias, 1989 Vision Research 29 137 - 142). If so, CM gratings and luminance-modulated (LM) gratings of similar effective contrast and spatial frequency should mask the detection of sinusoids in a similar fashion. We compared the effects of masking by 1 cycle deg-1 CM gratings [both simple beats (8+9 cycles deg-1) and amplitude-modulated gratings (8+9+10 cycles deg-1)], with those of masking by 1 cycle deg-1 LM gratings of low contrast. We found that: (i) CM and low-contrast LM grating masks yielded similar spatial-frequency tuning functions around the modulation frequency of 1 cycle deg-1; (ii) low-contrast LM gratings masked the detection of test sinusoids in a highly phase-dependent fashion, while masking by CM gratings did not vary systematically with relative spatial phase. The results suggest that masking produced by CM gratings cannot simply be explained by the presence of a distortion product at the beat or modulation frequency.

Item Type: Article
Print ISSN: 0301-0066
Electronic ISSN: 1468-4233
Uncontrolled Keywords: Contrast sensitivity; lighting; pattern recognition; perceptual masking; psychophysiology;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Health and Social Sciences
Dewey Decimal Subjects: 100 Philosophy & psychology > 150 Psychology > 152 Perception, movement, emotions & drives
Library of Congress Subjects: B Philosophy. Psychology. Religion > BF Psychology
Item ID: 4895
Depositing User: Mrs Lyn Gibson
Date Deposited: 17 Jan 2012 18:06
Last Modified: 17 Sep 2013 11:29

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