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Time course of events in a sample trial. Each trial comprised two intervals delimited either by auditory stimuli ((a) red time line), visual stimuli ((b) blue time line) or by visual then auditory ((c) light green time line) or auditory then visual stimuli ((d) dark green time line). One interval (randomly first or second) had a fixed base duration of τ ms throughout the session, while the other had duration of τ+Δτ ms, with Δτ varying from trial to trial.
