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 | χ^{2}(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 | χ^{2}(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 | χ^{2}(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.