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• W2021121471 endingPage "259" @default.
• W2021121471 startingPage "243" @default.
• W2021121471 abstract "We consider the overall shape of the second-order modulation sensitivity function (MSF). Because second-order modulations of local contrast or orientation require a carrier signal, it is necessary to evaluate modulation sensitivity against a variety of carriers before reaching a general conclusion about second-order sensitivity. Here we present second-order sensitivity functions for new carrier types (low pass (1/f) noise, and high pass noise) and demonstrate that, when first-order artefacts have been accounted for, the shape of the resulting MSFs are similar to one another and to those for white and broad band noise. They are all low pass with a likely upper frequency limit in the range 10-20 c/deg, suggesting that detection of second-order stimuli is relatively insensitive to the structure of the carrier signal. This result contrasts strongly with that found for (first-order) luminance modulations of the same noise types. Here the noise acts as mask and each noise type masks most those frequencies that are dominant in its spectrum. Thus the shape of second-order MSFs are largely independent of the spectrum of their noise carrier, but first-order CSFs depend on the spectrum of an additive noise mask. This provides further evidence for the separation of first- and second-order vision and characterises second-order vision as a low pass mechanism." @default.
• W2021121471 created "2016-06-24" @default.
• W2021121471 creator A5001743999 @default.
• W2021121471 creator A5071854110 @default.
• W2021121471 date "2003-02-01" @default.
• W2021121471 modified "2023-09-26" @default.
• W2021121471 title "Sensitivity to contrast modulation: the spatial frequency dependence of second-order vision" @default.
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• W2021121471 doi "https://doi.org/10.1016/s0042-6989(02)00542-4" @default.
• W2021121471 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12535984" @default.
• W2021121471 hasPublicationYear "2003" @default.
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