Although ten days of practice on the 100 ms intervals dramatically improved people’s ability to discriminate intervals around 100 ms, it did not improve the interval discrimination thresholds for the 50, 200, or 500 ms intervals at all.9 If learning on the 100 ms interval came from improved focus, then subjects would likely improve on all intervals, but we did not observe that. More importantly, this result, which has since been replicated in numerous other studies,10 suggests that however the brain is telling time in the subsecond range, it does not seem to be via any sort of master stopwatch
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