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Historical demonstrations of maximum sensitivity to modulations in the range ~2-5 Hz. See text for info. a) Riesz (1928), beats (SAM tones). b) Shower and Biddulph (1931), FM tones. c) Pollack (1951), interrupted white noise. d) Tonndorf et al. (1955), SAM tones. e) Stott and Axon (1955), SAM white noise. f) Dubrovskii and Tumarkina (1967), SAM white noise.
