Dopamine precursor depletion affects performance and confidence judgements when events are timed from an explicit, but not an implicit onset.

Although a three-way interaction between task, drink type and the logarithm of the presented duration only tended towards significance (χ 2 (1) = 3.766, p = 0.052), comparison of slopes for the two temporal tasks indicated a difference between slopes in the explicit, but not implicit, onset task (explicit: BAL – APTD, difference in effect = 0.2928 (SE = 0.143), z-ratio = 2.044, p < 0.05; implicit: BAL – APTD, difference in effect = − 0.0981 (SE = 0.141), z-ratio = − 0.694, p = 0.4877).

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