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Mean log threshold contrast as a function of log target duration for the four observers for the asynchronous (A) and synchronous (B) conditions, with targets presented either in static noise (unfilled and filled circles), dynamic noise (unfilled and filled triangles), or in the absence of noise (half-filled diamonds). Error bars indicate standard errors of the means (SEMs). Curves represent least-squares best fits of Eq. 2. Target durations in ms are indicated on the top x-axis.
