LAUSR

Rippled-spectrum (RS) signals are used for evaluation of resolution of spectro-temporal structure of sounds. Measurements of spectrum-pattern resolution imply discrimination between the test and reference signals. Therefore, estimates of rippled-pattern resolution may depend not only on the test signal but also on the reference signals. In the present study, the ripples density resolution was measured in combinations of the test and reference signals: (i) RS with phase reversals vs RS without phase reversion; (ii) RS with phase reversals vs non-rippled spectrum; (iii) RS without phase reversals vs non-rippled spectrum; and (iv) RS without phase reversals vs RS of opposite ripple phase. The spectra were centered at 2 kHz and had ERB of 1 oct and SPL of 70 dB. A three-alternative forced-choice procedure was combined with adaptive stimulation procedure. With rippled reference signals, mean ripple resolution limits were 8.9 ripple/oct (phase-reversals test signal) or 7.7 ripple/oct (constant-phase test signal...