Observation Gender Dosage Alertness 1 m a 8 2 m a 12 3 m a 13 4 m a 12 5 m b 6 6 m b 7 7 m b 23 8 m b 14 9 f a 15 10 f a 12 11 f a 22 12 f a 14 13 f b 15 14 f b 12 15 f b 18 16 f b 22