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. Author manuscript; available in PMC: 2012 May 8.
Published in final edited form as: Vision Res. 2008 Oct 14;49(10):1336–1351. doi: 10.1016/j.visres.2008.07.025

Figure 2.

Figure 2

Performance signatures of the perceptual template model for stimulus enhancement (Aa, top), external noise reductions (Af, middle), and multiplicative noise reduction (Am, bottom) for dual-object dual-response (dashed line) and single-object single-response (solid line) conditions. (a) The signature differences in threshold versus external noise contrast (TvC) functions, which graph the contrast threshold (log2(CT)) against the external noise contrast (log2(Next)). (b) Psychometric functions showing accuracy (d′) versus stimulus contrast in no external noise (left) and high external noise (right). Stimulus enhancement shows an effect at lower contrasts in no noise; external noise exclusion shows an effect at lower contrasts in high noise; and multiplicative noise reduction shows an effect in both noises, focused at high contrasts in the psychometric functions. The perceptual template parameters used to generate these functions were: Nm= 0.3, Na =0.06, β = 2, γ = 2, Am = 1.4, Aa = 1.8, and Af = 1.4.