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Dear Friends: I'm designing a ER fMRI study of attention. I want to differentiate the signal between cue and target. I know the interval between the cue and target should be a exponential distribution. The interval between cue and target should not be too short, e.g. < 400ms, but also should not too long. Otherwise cue is not cue anymore. Could anyone give me a suggestion what is the best range of intervals between cue and target? Thanks Jiansong