15th International Congress of Phonetic Sciences (ICPhS-15)
Many studies based on instrumental techniques have been carried out since the 1960's to investigate vowel-intrinsic fundamental frequency, intensity and duration. However, the first systematic work on the inherent fundamental frequency and intensity of vowels - in fact, of consonants too - appears to have been performed as a series of perception experiments during the years 1913-1915 by the German experimental psychologist Hans Ruederer; it was published in his doctoral dissertation (Munich, 1916). The results of his perception experiments are compatible with those obtained by instrumental phonetics, and generally far precede them.
Bibliographic reference. Möbius, Bernd (2003): "Gestalt psychology meets phonetics - an early experimental study of intrinsic F0 and intensity", In ICPhS-15, 2677-2680.