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Placebo response to caffeine improves reaction time performance in sleepy people.
Hum Psychopharmacol 2008; 23(4):333-6HP

Abstract

Caffeine is the most widely used stimulant to counteract sleepiness. However, little is known about any placebo effect of caffeine in sleepy people and the effect of suggestibility. Over a 95 min test period, and in a counterbalanced design, 16 young healthy adults underwent 3 x 30 min sessions at the psychomotor vigilance test (PVT), during an early afternoon 'dip' enhanced by a prior night's sleep restriction (5 h). On both occasions they were given a cup of a decaffeinated coffee; once when the participant was verbally primed to suggest the coffee was caffeinated (Placebo) and on the other under neutral priming (Control). There were significantly fewer lapses and shorter reaction times following Placebo, for the initial two 30 min sessions, indicating that suggestion about consuming caffeine was effective in improving performance in moderately sleepy people.

Authors+Show Affiliations

Sleep Research Centre, Department of Human Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK. c.anderson@lboro.ac.ukNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18350573

Citation

Anderson, Clare, and James A. Horne. "Placebo Response to Caffeine Improves Reaction Time Performance in Sleepy People." Human Psychopharmacology, vol. 23, no. 4, 2008, pp. 333-6.
Anderson C, Horne JA. Placebo response to caffeine improves reaction time performance in sleepy people. Hum Psychopharmacol. 2008;23(4):333-6.
Anderson, C., & Horne, J. A. (2008). Placebo response to caffeine improves reaction time performance in sleepy people. Human Psychopharmacology, 23(4), pp. 333-6. doi:10.1002/hup.931.
Anderson C, Horne JA. Placebo Response to Caffeine Improves Reaction Time Performance in Sleepy People. Hum Psychopharmacol. 2008;23(4):333-6. PubMed PMID: 18350573.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Placebo response to caffeine improves reaction time performance in sleepy people. AU - Anderson,Clare, AU - Horne,James A, PY - 2008/3/20/pubmed PY - 2008/8/30/medline PY - 2008/3/20/entrez SP - 333 EP - 6 JF - Human psychopharmacology JO - Hum Psychopharmacol VL - 23 IS - 4 N2 - Caffeine is the most widely used stimulant to counteract sleepiness. However, little is known about any placebo effect of caffeine in sleepy people and the effect of suggestibility. Over a 95 min test period, and in a counterbalanced design, 16 young healthy adults underwent 3 x 30 min sessions at the psychomotor vigilance test (PVT), during an early afternoon 'dip' enhanced by a prior night's sleep restriction (5 h). On both occasions they were given a cup of a decaffeinated coffee; once when the participant was verbally primed to suggest the coffee was caffeinated (Placebo) and on the other under neutral priming (Control). There were significantly fewer lapses and shorter reaction times following Placebo, for the initial two 30 min sessions, indicating that suggestion about consuming caffeine was effective in improving performance in moderately sleepy people. SN - 1099-1077 UR - https://www.unboundmedicine.com/medline/citation/18350573/Placebo_response_to_caffeine_improves_reaction_time_performance_in_sleepy_people_ L2 - https://doi.org/10.1002/hup.931 DB - PRIME DP - Unbound Medicine ER -