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Effect of visual distractor on TSD plotted against temporal frequency. The parameters of the psychometric functions fit to individual subjects’ data: μ (○) denotes a biasing effect, σ (□) an effect on discriminability (see text). —, parameters fitted to data obtained with a 5-mm visual distractor; · · · , data obtained with a 20-mm distractor. The magnitude of the effect of the visual distractor is a function of its temporal frequency. Error bars represent ±1 SE.
