Masking by spatially-modulated gratings
| Autor: | Jacob Nachmias, Bernice E. Rogowitz |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
Physics
Light genetic structures Distortion product business.industry Acoustics Perceptual Masking Grating behavioral disciplines and activities Luminance Sensory Systems Form Perception Photometry Ophthalmology Nonlinear system Optics Pattern Recognition Visual Form perception Sensory Thresholds Sensory threshold Humans Relative phase business psychological phenomena and processes |
| Zdroj: | Vision Research. 23:1621-1629 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/0042-6989(83)90176-1 |
| Popis: | Contrast- or quasi-frequency-modulated masker gratings consisting of three high frequency components (8.8, 11 and 13.2 c/deg) affect the detectability of a 2.2 c/deg signal grating, to an extent that is strongly dependent upon the relative phase between signal and masker. Unmodulated high frequency maskers have no such phase-dependent effects. This paper explores the possibility that the visual system's nonlinear response to luminance is responsible for these phenomena. A specific hypothesis is proposed according to which the effects of the spatially modulated maskers are due entirely to a distortion product at 2.2 c/deg caused by the visual nonlinearity. Although some of the predictions of this hypothesis are borne out by the experimental findings, others are contradicted. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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