Middlemist, Knowles & Matter (1976) designed an experiment to test how the speed and flow of men's urination in a public bathroom was affected by invasions of personal space.
They forced unknowing urinators to use one out of the 3 of the urinals provided, then one person who was in on the experiment stood either directly next to the subjects or one urinal away, and sometimes was not present at all.
Hidden in a stall was the “urine measurement officer” Equipped with a specially designed periscope hidden in a stack of books ready to measure the urine streams of unknowing test subjects.
The experimental confirmed the following: With no one present, unselfconscious urinators' average onset of urination was 4.8 seconds, with the accomplice present one urinal away, mildly self-conscious urinators' average onset of urination took up to 6.2 seconds. Finally with the accomplice in the next urinal, it was 8.4 seconds before bashful toilet-goer's could relieve themselves.
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