Tactile frequency discrimination is crude, often off by an octave

Evidence

The JND of the level of stimulus is thought to be of the order of 1 dB, which is similar to that for auditory perception. In frequency-matching tasks, subjects identify relatively accurately or misjudge to be an octave lower a tactile sinusoidal stimulation between 60 and 180 Hz (Altinsoy and Merchel, 2010). — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1825