Weber fraction for tones is level but not frequency dependent

Evidence

Jesteadt et al.’s data look rather different from those of Miller, as the functions for pure tones are not horizontal lines, but rather they have negative slopes. Jesteadt et al. actually measured seven different tone frequencies, with the same results for all frequencies. … The Weber fraction was not dependent on frequency. The overall sensitivity for intensity discrimination did not vary with frequency, and the slope of the near miss to Weber’s law was constant across the frequencies up to about 10 kHz. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 822