The auditory system represents modulations below 55 Hz well and worse above

Evidence

As the modulation rate was increased, the task became more difficult, and listeners needed more modulation to detect it. The poorest threshold was reached at a modulation rate of approximately 1000 Hz, but even here listeners still only needed about 20% of modulation to detect it. If one considers the TMTF to be similar to a low-pass filter, the TMTF has a cut-off frequency of 55 to 65 Hz. Thus, modulation rates below about 55 Hz are well represented by the auditory system, and rates higher than that become more poorly represented. Across the board, however, the ability to detect the presence of modulation is quite excellent. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1010

Categorization

• DEFINE: Specifies the TMTF cutoff frequency of 55-65 Hz, a quantitative anchor for temporal resolution.