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We investigated the impact of cholinergic drugs on the ability of Alzheimer patients to benefit from spatial localization information in feature and conjunction visual search. Four rectangles were used as valid precues that varied in spatial precision from the area of the target to the area of the entire stimulus array. Eleven patients and 11 elderly controls completed visual search after intravenous scopolamine and at no-drug baseline; patients received intravenous physostigmine. Scopolaminedoi:10.1017/s1355617798000010 fatcat:nwx22nwabzcc5lggym7t6prxoy