This increasingly common use of caffeine in our society coincides with an increasingly common trend of individuals obtaining insufficient sleep on a regular basis. For the 90 th percentile of caffeine users, intakes approximated 5–7 mg/kg body weight (approximately 300–500mg). Based on the available product usage and food consumption data, Barone and Roberts ( Barone J 1996) estimated the mean daily intake was 4 mg/kg body weight (approximately 280mg for a 155 pound person 16 ounces of Starbucks coffee contains 372 mg). Modern times have led to an increase in daily, often multiple doses of caffeine, a rise in the coffee business, and the addition of caffeine to common beverages such as soda, bottled water, and even chewing gum. 2003), is an active ingredient in coffee, tea, chocolate, sodas, and energy drinks (the fastest growing sector of the American beverage industry)( Lovett 2005). We hypothesize that impairment from caffeine may be restricted to tasks that contain explicit information whereas strictly implicit learning is less compromised.Ĭaffeine, the world’s most widely consumed stimulant ( Nawrot et al. These findings provide evidence of the limited benefits of caffeine for memory improvement compared with napping. Napping produced robust perceptual learning compared with placebo however, naps and caffeine were not significantly different. Caffeine significantly impaired motor learning compared to placebo and naps. Naps enhanced recall of words after a 7hr and 20min retention interval relative to both caffeine and placebo. The non-declarative tasks (finger tapping task and texture discrimination task) were trained before the intervention and then retested afterwards. A second, different, word list was administered post-intervention and memory was tested after a 20min retention period. In the verbal task, recall and recognition for unassociated words were tested after a 7hr retention period (with a between-session nap or drug intervention). We directly compared caffeine (200mg) with napping (60–90 minutes) and placebo on three distinct memory processes: declarative verbal memory, procedural motor skills, and perceptual learning. Napping has been shown to increase alertness and promote learning on some memory tasks. Little is known, however, about its benefits for memory. Caffeine, the world’s most common psychoactive substance, is used by approximately 90% of North Americans everyday.
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