A series of forty-eight stimulus patterns were painted and converted to sound by the pattern playback. Variations were made in F2 transition frequencies, in the frequency of F1 resonances, and in the presence or absence of resonances in the F2 and F3 regions. The test was administered for identification as /m, n, ñ, ŋ, or 1/. Subjects were only partially naive in some cases.
Results indicate that the principal discrimination cues are definitely the F2 transition onset frequency and the frequency of the F1 resonance portion. F2 and F3 resonances apparently operate as powerful cues only in the presence of maximally ambiguous F2 information.
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