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I'm a trainee  https://www.drugonsale.com viagra  "It might be that physiological processes [of drinking or not drinking water] affect performance on different tasks in different ways," study researcher Caroline Edmonds, of the University of East London School of Psychology in England, told LiveScience. She added that thirst might lead to better performance on some tasks, because the hormone vasopressin, which activates the thirst response, has been linked to attention and arousal.