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Averages and standard errors of just noticeable differences (JNDs) in the speed-discrimination task for a sample of 8 subjects. We investigated combinations of 3 standard speeds [SS; 3, 5, and 7 arbitrary units (AU)/s] and 2 modality conditions; tactile (light bars) and visual (dark bars). Differences between modality conditions were not statistically significant (paired 2-way ANOVA, P > 0.05).
