“…Because of the necessity of stimulus control in experimental studies of perception, until recently previous research has used electronic or synthesized sound sources in place of acoustical instruments. These studies have indicated that perceived pitch corresponds closely to the mean of the frequency-modulated sound (Iwamiya, Kosugi, & Kitamura, 1983;Seashore, 1938;Shonle & Horan, 1980;van Besouw, Brereton, & Howard, 2008). Shonle and Horan extended the range of modulations to whole tones, and found that perceived pitch of those wider modulations corresponded more closely to the geometric mean of the extreme frequencies, a frequency only slightly lower than the arithmetic mean.…”