John W. Hawks
School of Speech Pathol. and Audiol., Kent State Univ., Kent, OH 44242
The effects of interaction of low-frequency tone complexes and high-frequency tone complexes on the thresholds of discrimination (DLs) for a change in periodicity pitch in one of the two frequency regions were studied. Stimuli were digitally constructed by summing sine waves spaced at 100- or 200-Hz intervals. The amplitude of components of one of the interacting complexes was fixed while the periodicity pitch of the other complex was obtained by decrementing amplitude of components in 1-dB steps. DLs were obtained for (1) low-frequency complexes only, (2) high-frequency complexes only, (3) low-frequency complexes in the presence of high-frequency complexes, and (4) high-frequency complexes in the presence of low-frequency complexes. Preliminary results indicate elevated DLs for high-frequency complexes in condition 2 and elevated DLs (significant interference effects) in conditions 3 and 4. Interference effects were greater for condition 4 relative to condition 3. Implications in terms of temporal fine structure and envelope cues are discussed.