Subject	Drug	TapRate
I	Placebo	11
II	Placebo	56
III	Placebo	15
IV	Placebo	6
I	Caffeine	26
II	Caffeine	83
III	Caffeine	34
IV	Caffeine	13
I	Theobromine	20
II	Theobromine	71
III	Theobromine	41
IV	Theobromine	32