Age-related differences in the temporal modulation transfer function with pure-tone carriers

Detection of amplitude modulation (AM) in 500 and 4000Hz tonal carriers was measured as a function of modulation frequency from younger and older adults with normal hearing through 4000Hz. The modulation frequency above which sensitivity to AM increased (“transition frequency”) was similar for both groups. Temporal modulation transfer function shapes showed significant age-related differences. For younger subjects, AM detection thresholds were...