caa a22 4500 469122102 CHVBK 20180323133142.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF02801974 doi (NATIONALLICENCE)springer-10.1007/BF02801974 Expected effect of caffeine on motor performance predicts the type of response to placebo [Elektronische Daten] [M. Fillmore, M. Vogel-Sprott] Two experiments (N=56) investigated the relationship between subjects' expectancies concerning the effect of caffeine on a motor skill, and the type of placebo response. Male subjects were assigned to four groups. Three groups expected to receive caffeine but received a placebo. Prior to the placebo, two of the groups received information about the effect of caffeine on a motor skill task which led one group E(+) to expect enhanced performance, and the other E(−) to expect impairment. The third placebo group received no information E(?). A control group E(0) received no beverage, so neither caffeine nor any effect on performance was expected. The expected type of effect predicted the type of placebo response displayed. Group E(+) displayed greater improvement under placebo than did group E(0), and group E(−) performed more poorly than those in group E(0). No placebo response was observed in group E(?). Placebo effects on mood were correlated with subjects' predictions about the effect of caffeine on mood. The role of expectancies in response to placebos and psychoactive drugs is discussed. Springer-Verlag, 1992 Placebo nationallicence Expectancy nationallicence Learning nationallicence Humans nationallicence Fillmore M. Department of Psychology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada aut Vogel-Sprott M. Department of Psychology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada aut Psychopharmacology Springer-Verlag 106/2(1992-06-01), 209-214 0033-3158 106:2<209 1992 106 213 https://doi.org/10.1007/BF02801974 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02801974 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fillmore M. Department of Psychology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada aut NATIONALLICENCE 700 1- Vogel-Sprott M. Department of Psychology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada aut NATIONALLICENCE 773 0- Psychopharmacology Springer-Verlag 106/2(1992-06-01), 209-214 0033-3158 106:2<209 1992 106 213 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer