Analysis of Genetic and Non-Genetic Factors Influencing Timing and Time Perception.

Group means were underestimated at each interval (p < 0.0001), and there was a significant trend for underproduction to decrease as the interval lengthened (p < 0.001; ratios of 0.73, 0.76, 0.81, 0.85, and 0.88 respectively for 1, 3, 6, 12 and 15 sec).

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However, prior to taking intelligence into account, there was a strong trend for older individuals to underproduce requested intervals and to have larger duration discrimination thresholds.

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