Caffeine reduces time-of-day effects on memory performance in older adults

T Lee Ryan, Colleen Hatfield, Melissa Hofstetter

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

For most older adults, memory performance depends on the time of day, with performance being optimal early in the morning and declining during the late afternoon hours. In the present study, we asked whether this decline could be ameliorated by a simple stimulant, caffeine. Adults over the age of 65 who considered themselves "morning types" were tested twice over an interval of 5 to 11 days, once in the morning and once in the late afternoon. Participants ingested either coffee with caffeine or decaffeinated coffee at both sessions. Participants who ingested decaffeinated coffee showed a significant decline in memory performance from morning to afternoon. In contrast, those who ingested caffeine showed no decline in performance from morning to afternoon. The results suggest that time-of-day effects may be mediated by nonspecific changes in level of arousal.

Original languageEnglish (US)
Pages (from-to)68-71
Number of pages4
JournalPsychological science : a journal of the American Psychological Society / APS
Volume13
Issue number1
StatePublished - Jan 2002

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Coffee
Caffeine
Arousal

ASJC Scopus subject areas

  • Psychology(all)

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Caffeine reduces time-of-day effects on memory performance in older adults. / Ryan, T Lee; Hatfield, Colleen; Hofstetter, Melissa.

In: Psychological science : a journal of the American Psychological Society / APS, Vol. 13, No. 1, 01.2002, p. 68-71.

Research output: Contribution to journalArticle

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