The test pulses were the first or last in the pulse sequence with repetition period of T. The dependences of the
detection threshold of test pulses loudness on the period T were obtained. The goal was to study the properties of
temporal resolution and changes of test pulses loudness. Test pulse and 11 masking pulses have a center frequency of 4
kHz and a frequency band of 240 Hz. The level of masking pulses was 80 dB SPL. The period T varied in the range of
20–150 ms. Temporal resolution of the test pulse loudness corresponded to the minimum period, a Tmin threshold, at which
the listener could hear the test pulse. The pulse loudness changes, a dIso shifts, were estimated as the difference
between the detection thresholds of the test pulses presented in the pulse sequence with period Tmin and in silence. The
Tmin threshold and the dIso shifts were compared with the auditory sensitivity of the listeners, as well as with the
temporal summation of tones and pulse sequences. Five listeners with normal hearing ~20 dB were included in first group
and two listeners with highfrequency hearing loss of ~40 dB – in second group. For listeners of two groups, temporal
resolution and loudness changes of the test pulses correlated with auditory sensitivity, but for listeners of the first
group, the same properties correlated with temporal summation of the pulse sequences. For the listeners of the first
group, the Tmin threshold was of 25 ms when temporal summation of the pulse sequences were equal to ~2 dB, but increased
up to 50–80 ms when the temporal summation increased up to ~6 dB. At the same time the dIso shift reached 14–28 dB for
the last test pulse, and 10–23 dB for the first test pulse. For the listeners of the second group, the Tmin thresholds
were high, ~80–150 ms, and the dIso shifts were low, ~0–9 dB. The Tmin threshold and the dIso shift could characterize
the auditory temporary processing of periodic sounds in the listeners.
loudness, impulse, periodic sequence, masking, summation
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