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Caffeine effects on arousal and cognition were assessed in relation to habitual caffeine intake. Aft.er drinking either decaffeinated coffee or decaffeinated coffee plus 300 mg caffeine, 22 heavy caffeine consumers (HCCs) and 26 light caffeine consumers (LCCs) were examined on various cognitive, autonomic, and anxiety measures. In LCCs only, caffeine significantly improved performance of the Wisconsin Card Sorting Test, and significantly increased state anxiety scores. Caffeine significantlydoi:10.1080/00049530410001688119 fatcat:yojfzdpe2fhkbh6hvhnkwaf6ey