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The procedure during a test day with time displayed on the horizontal axis. Oral doses of cetirizine 10 mg, 20 mg or placebo was administered at 9:00 am, which was followed by testbatteries at 10:00 (T1) and 12:00 (T3). Test sessions consisted of 15-word learning task, a critical flicker/fusion frequency test, a visual vigilance task, a critical tracking task, a divided attention task and a memory scanning task and a critical flicker/fusion frequency test again.
