Abstract
The validity of self-report for studying yawning in the laboratory was examined. Thirty undergraduate students were assigned to one of two groups. Both groups recorded their own yawns using an Esterline Angus Chart Recorder. One group was given complete privacy, and the other group was videotaped through a two-way mirror. The observed group accurately recorded yawn frequency, yawn duration, and interyawn interval. The unobserved group did not differ from the observed group in recorded yawn frequency. Yawn duration and frequency were uncorrected, and there was no correlation between duration and interyawn interval. Self-report is a valid measure of yawning and may be one of the only ways to study yawns in the laboratory, because it removes any inhibition against yawning in public.
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