Table S4.

Means (SD) in follow-up studies 1–3

StudyConditionPerceived timeIntent (continuous)Intent (dichotomous)
Follow-up study 1 (n = 557)Regular speed57.74 (29.56)75.64 (26.95)82.0% (0.39)
Both speeds61.83 (28.26)76.48 (26.45)83.2% (0.38)
Regular speed vs. both speeds
 Test statistict(555) = 1.67t(555) = 1.67χ2(1) = 0.12
P valueP = 0.095P = 0.712P = 0.730
 Effect sized = 0.14d = 0.03φ = 0.02
Follow-up study 2 (n = 560)Regular speed57.67 (30.70)77.17 (28.64)81.7% (0.39)
Both speeds66.93 (26.45)79.15 (24.37)87.0% (0.34)
Regular speed vs. both speeds
 Test statistict(554.7) = 3.83t(553.6) = 0.88χ2(1) = 3.04
P valueP < 0.001P = 0.377P = 0.081
 Effect sized = 0.33d = 0.08φ = 0.07
Follow-up study 3 (n = 715)Regular speed57.77 (29.80)74.87 (29.15)73.7% (0.44)
Both speeds66.61 (26.08)77.98 (25.46)77.1% (0.42)
Regular speed vs. both speeds
 Test statistict(700.1) = 4.22t(699.8) = 1.52χ2(1) = 1.13
P valueP < 0.001P = 0.129P = 0.288
 Effect sized = 0.32d = 0.12φ = 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.