Figure 2.

TMTFs of humans, sorted by the carrier bandwidth of the stimulus. The TMTF is defined as the AM detection threshold as a function of the AM rate. Amplitude modulation of broadband carriers yields low-pass-shaped TMTFs with lower thresholds at low AM rates and higher thresholds at high AM rates, whereas it yields high-pass-shaped TMTFs for narrowband carriers. Other stimulus parameters also appear to affect TMTFs. The depicted TMTFs were taken from psychophysics papers (Viemeister, 1979; Dau et al., 1997a; Lorenzi et al.,2001a,b). Each line shows a TMTF in a single person.