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Having brought forward a new theory of auditory perception (Phonetica, vol. 14, 1966, and vol. 17, 1967), the author presents some new arguments sustaining that theory. Moreover, he finds a simple and accurate mathematical relation between the numbers of ‘just noticeable differences in intensity’ and the subjective loudness of sound, for 4,000 and 10,000 cps; whereas that relation is altered for 1,000 and 7,000 cps by a phenomenon of loss of auditory sensitivity from the threshold of hearing, which disappears at the average levels of intensity. That consideration seems to confirm once more the author’s hypothesis: low, average, and high frequencies are perceived by the brain as different sound ‘qualities’ which may be compared in every respect to the three fundamental hues of colour perception by the eye.

Relation entre la force subjective du son et le nombre de paliers de perception différentielle d’intensité pour quatre fréquences caractéristiques