Lateralization and sequential relationships in the octave illusion
conditions, the amplitude relationships between the higher arid lower tones were varied, and the percent lateralization to the higher frequency signal was plotted as a function of these amplitude relationships. In all conditions, when the tones at the two ears were equal in amplitude, latera, lization tended to be toward the ear receiving the higher frequency signal. Averaged across subjects, this tendency in condition 1 was overcome only when the lower frequency signal was 12 dB higher in amplitude, and, in condi.tion 2, when it was 9 dB h. igher. However, in condition 3, the tendency was overcome when the lower frequency signal was 3 dB higher in amplitude. The lateralization effect was thus shown to be influenced by the sequential relationships between the frequencies presented to the two ears.