Matthews, W. J., & Stewart, N. (2008). The effect of stimulus range on two-interval frequency discrimination. Journal of the Acoustical Society of America, 123, EL45-EL51.

It has traditionally been thought that performance in two-interval frequency discrimination tasks decreases as the range over which the standard tone varies is increased. Recent empirical evidence and a reexamination of previous results suggest that this may not be the case. The present experiment found that performance was significantly better when the standard roved over a wide range 1500 Hz than a narrow range 30 Hz. This pattern cannot readily be accommodated by traditional models of frequency discrimination based on memory or attention, but may be explicable in terms of neural plasticity and the formation of perceptual anchors.