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Experimental paradigm. The cue and target were randomly selected for each trial from three different cue types and two different target types. S, Short foreperiod (600 ms); L, long foreperiod (1400 ms); N, neutral cue (600 or 1400 ms); ITI, intertrial interval. The meaning of the target (x or +) was contingent on the experimental condition (detection, go/no-go, or forced choice).
