caa a22 4500 469118873 CHVBK 20180323133132.0 cr unu---uuuuu 170328e19921001xx s 000 0 eng 10.1007/BF02245489 doi (NATIONALLICENCE)springer-10.1007/BF02245489 Effects of caffeine, time of day and user history on study-related performance [Elektronische Daten] [Paula Mitchell, Jennifer Redman] The individual and interactive effects of caffeine, time of day and history of caffeine consumption on several study-related tasks were investigated in 25 subjects (6 males, 19 females). Performance was measured on short term memory (STM), mental arithmetic (MA), reading comprehension, serial search (SS) and verbal reasoning (VR). Subjects attended eight experimental sessions, at four times of day (0100, 0700, 1300 and 1900 hours), after ingesting caffeine (4 mg/kg) or placebo. Subjects were assigned to a low, moderate or high user group on the basis of a caffeine consumption questionnaire. Reading comprehension was affected by time of day, while caffeine improved performance on all mental speed-related tasks. High caffeine users performed more poorly than other groups on the verbal reasoning task. Several interactions between the three independent variables were observed on a number of tasks, supporting the contention that different processes underlying various types of cognitive performance are differentially, and often jointly, affected by caffeine, time of day and user history. Implications of caffeine usage on academic performance were discussed. Springer-Verlag, 1992 Caffeine nationallicence Time of day nationallicence Consumption history nationallicence Performance nationallicence Mitchell Paula Department of Psychology, Monash University, 3168, Clayton, Victoria, Australia aut Redman Jennifer Department of Psychology, Monash University, 3168, Clayton, Victoria, Australia aut Psychopharmacology Springer-Verlag 109/1-2(1992-10-01), 121-126 0033-3158 109:1-2<121 1992 109 213 https://doi.org/10.1007/BF02245489 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02245489 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mitchell Paula Department of Psychology, Monash University, 3168, Clayton, Victoria, Australia aut NATIONALLICENCE 700 1- Redman Jennifer Department of Psychology, Monash University, 3168, Clayton, Victoria, Australia aut NATIONALLICENCE 773 0- Psychopharmacology Springer-Verlag 109/1-2(1992-10-01), 121-126 0033-3158 109:1-2<121 1992 109 213 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer