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• W2100455770 abstract "White pixel noise is widely used to estimate the level of internal noise in a system by injecting external variance into the detecting mechanism. Recent work (Baker and Meese, 2012) has provided psychophysical evidence that such noise masks might also cause suppression that could invalidate estimates of internal noise. Here we measure neural population responses directly, using steady-state visual evoked potentials, elicited by target stimuli embedded in different mask types. Sinusoidal target gratings of 1 c/deg flickered at 5 Hz, and were shown in isolation, or with superimposed orthogonal grating masks or 2D white noise masks, flickering at 7 Hz. Compared with responses to a blank screen, the Fourier amplitude at the target frequency increased monotonically as a function of target contrast when no mask was present. Both orthogonal and white noise masks caused rightward shifts of the contrast response function, providing evidence of contrast gain control suppression. We also calculated within-observer amplitude variance across trials. This increased in proportion to the target response, implying signal-dependent (i.e., multiplicative) noise at the system level, the implications of which we discuss for behavioral tasks. This measure of variance was reduced by both mask types, consistent with the changes in mean target response. An alternative variety of noise, which we term zero-dimensional noise, involves trial-by-trial jittering of the target contrast. This type of noise produced no gain control suppression, and increased the amplitude variance across trials." @default.
• W2100455770 created "2016-06-24" @default.
• W2100455770 creator A5011143446 @default.
• W2100455770 creator A5029555146 @default.
• W2100455770 date "2014-07-15" @default.
• W2100455770 modified "2023-09-26" @default.
• W2100455770 title "Broadband noise masks suppress neural responses to narrowband stimuli" @default.
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• W2100455770 doi "https://doi.org/10.3389/fpsyg.2014.00763" @default.
• W2100455770 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4098025" @default.
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• W2100455770 hasPublicationYear "2014" @default.
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