Abstract
I WISH to comment on Rushton's article on humming and vision1. If a cathode ray oscilloscope (CRO) is operated in a free running sweep mode with a horizontal speed of about 100 cm/s, an observer will see a single horizontal straight line, as expected. If the observer coughs or clears his throat he sees a transient signal. If he sustains a “throat clearing” vibration of about 50–100 Hz, he will observe a steady sinusoidal signal on the CRO. The amplitude of the signal depends on the observer and his vocal intensity, a typical value being 5 mm at a distance of 200 cm. The amplitude increases with distance. Humming does not produce a detectable signal.
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Rushton, W. A. H., Nature, 216, 1173 (1967).
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EASTMAN, P. Effect of Humming on Vision. Nature 222, 164 (1969). https://doi.org/10.1038/222164a0
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DOI: https://doi.org/10.1038/222164a0
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