Subjects were photographed with a moving-picture camera as they attempted to localize each of 10 sound sources in an anechoic room. High- and low-bandpass thermal noise stimuli of 5-sec duration were used. Changes in angular position of the head (and thus the ears) were measured from the film. Rotation movements of the head about a vertical axis (turning, left or right) were most commonly found—alone, in combination with tipping movement (nose up or down), or in combination with both tipping and pivot movements. (A “pivot” movement involves an increase in vertical height of one ear and a decrease in vertical height of the other.) A number of subjects also showed reversals in movement. The reversals were most prominent in the case of rotation movements. Quantitative summaries of observed movements are given.
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Thurlow et al. (1967) studied this question.