Figure 2.

Effect of stimulus change on apparent duration and discrimination thresholds. (A) Mean perceived duration (calculated as the 50% point on the psychometric function, PSE) across 15 subjects for three standard durations and three stimulus configurations. Dashed lines represent the actual standard durations. Error bars indicate ±1 SEM. (B) Proportion change in perceived duration relative to the true standard duration [calculated from the data plotted in (A)] for the same conditions as in (A). (C) Example psychometric curves for a naïve observer for the three stimulus configurations and for 600 ms standard duration. (D) Average discrimination thresholds (defined as the difference between the 50 and 84% point on the psychometric function/the standard duration) for the same subjects and conditions as in (A). Error bars indicate ±1 SEM.