Table S4.

Means (SD) in follow-up studies 1–3

 Study Condition Perceived time Intent (continuous) Intent (dichotomous) Follow-up study 1 (n = 557) Regular speed 57.74 (29.56) 75.64 (26.95) 82.0% (0.39) Both speeds 61.83 (28.26) 76.48 (26.45) 83.2% (0.38) Regular speed vs. both speeds Test statistic t(555) = 1.67 t(555) = 1.67 χ2(1) = 0.12 P value P = 0.095 P = 0.712 P = 0.730 Effect size d = 0.14 d = 0.03 φ = 0.02 Follow-up study 2 (n = 560) Regular speed 57.67 (30.70) 77.17 (28.64) 81.7% (0.39) Both speeds 66.93 (26.45) 79.15 (24.37) 87.0% (0.34) Regular speed vs. both speeds Test statistic t(554.7) = 3.83 t(553.6) = 0.88 χ2(1) = 3.04 P value P < 0.001 P = 0.377 P = 0.081 Effect size d = 0.33 d = 0.08 φ = 0.07 Follow-up study 3 (n = 715) Regular speed 57.77 (29.80) 74.87 (29.15) 73.7% (0.44) Both speeds 66.61 (26.08) 77.98 (25.46) 77.1% (0.42) Regular speed vs. both speeds Test statistic t(700.1) = 4.22 t(699.8) = 1.52 χ2(1) = 1.13 P value P < 0.001 P = 0.129 P = 0.288 Effect size d = 0.32 d = 0.12 φ = 0.04
• Perceived time and Intent (continuous) are on 0–100 scales. Intent (dichotomous) is the percentage indicating a verdict of first-degree murder as opposed to second-degree murder. When Levene’s test indicated unequal variances, degrees of freedom were adjusted.