Zwicker tones require a notched noise with edges separated by a fixed ratio

Evidence

To evoke ZTs, 5-s (including 20-ms onset and offset ramps) notched broadband noises (30-16000 Hz) were presented diotically at an rms level of 51 dB SPL. From one match to the next, the lower edge frequency (LEF) of the notch could take one of eight values: 2000, 2144, 2297, 2460, 2633, 2818, 3014, and 3500 Hz. The higher edge frequency (HEF) of the notch was always 1.5 times the LEF. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5404

Categorization

• DEFINE: Establishes the stimulus parameters (notched noise, LEF/HEF ratio of 1.5) that reliably evoke Zwicker tones, useful baseline for understanding the phenomenon.