Effects of fasting on visual flicker fusion.

M. R. Ali, T. Amir

    Research output: Contribution to journalArticlepeer-review

    35 Citations (Scopus)


    Two experiments are reported which investigated the effects of fasting on visual flicker fusion (VFF). In Exp. 1 the VFF of 40 undergraduate students, 20 men and 20 women, whose mean age was 22.5 yr., was measured in nonfasting conditions 1 to 2 weeks before and in fasting conditions during the Muslim fasting month of Ramadan. In Exp. 2 the VFF of a comparable group of 15 men and 15 women, whose mean age was 23.2 yr., was measured in a different month in both fasting and nonfasting conditions. Subjects were assigned randomly to these two conditions. Analysis shows that fasting reduced VFF significantly in both experiments. This finding indicates that fasting is likely to reduce perceptual sensitivity. The results were explained in terms of fatigue and physical exhaustion effects produced by fasting.

    Original languageEnglish
    Pages (from-to)627-631
    Number of pages5
    JournalPerceptual and motor skills
    Issue number2
    Publication statusPublished - Oct 1989

    ASJC Scopus subject areas

    • Experimental and Cognitive Psychology
    • Sensory Systems


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