Summary of experimental layout for all experiments.

<p>Each line represents an experimental block, which are grouped by experiment; subjects in Experiment 1 and 2 took part in two blocks, whereas in Experiment 5 two distinct groups of subjects took part in the two blocks. For each block, the table reports number of subjects (), interval ranges, type of distribution, probability of the ‘peak’ (i.e. most likely) intervals and shape of performance feedback. Tested ranges were Short (450–825 ms), Medium (600–975 ms), Long (750–1125 ms) and Wide (450–1125 ms), each covered by 6 intervals (10 for the Wide block) separated by 75 ms steps. Distributions of intervals were Uniform (1/6 probability per interval), Peaked/High-peaked (the ‘peak’ interval at 675 ms appeared with higher probability than non-peak stimuli, which were equiprobable), Bimodal (intervals at 600 and 975 ms appeared with higher probability) and Wide-Bimodal (intervals at 450–600 ms and 975–1125 ms appeared with higher probability). The Skewed feedback takes the form whereas the Standard feedback , where is the reproduced duration and is the target interval in a trial.