19 adult male voices were analyzed acoustically over two vowel sounds—/ee/ as in “heed” and /aw/ as in “hawed.” It was found that the individual differences observed on the utterances of /ee/ were preserved very closely (invariant) on the utterances of /aw/. Frequencies between 1000 cps and 2300 cps appeared not to play any part in producing this invariance.
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