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When a Symbol is "tracked" it means that when its value changes the Dynamic expression is refreshed, therefore your input updates as fast as possible because every refresh changes the value of t which causes a refresh which... you get the picture. Compare: Clear[t]; t = 1; Dynamic[Refresh[t++, UpdateInterval -> 1, TrackedSymbols -> {}]]


Refresh only sets a limit on how long expression can go without being updated. To keep t form being updated more often add a pause. t = 1; Dynamic[Refresh[Pause[1]; t++, UpdateInterval -> 1, TrackedSymbols :> {t}]] or do what Mr.Wizard indicated, which is better. But this sort of thing is best done by higher level constructs such as Clock or ...

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