Discrimination of sound signals (test and reference) with rippled spectrum structure was studied in conditions in which an additional signal was superimposed on the test and reference signals. The ripple phase in the test signal was inverted every 400 msec. The reference signals had either a rippled spectrum (with the same ripple density as the test signal but without alterNation of ripple phase) or a spectrum with an unresolvable ripple structure. The additional signal had the same spectral band and level as the test and reference signals and had either a flat spectrum or a rippled spectrum with ripple density 2–7 cycles/octave. With the rippled reference signal, ripple density resolution was 8.7 cycles/octave in controls (without superimposition of the additional signal), 8.5 cycles/octave with the flat additional signal, and 8.6–9.2 cycles/ octave with an additional signal with ripple density 2–7 cycles/octave; differences in these values from control were not statistically significant. With the reference signal with an unresolvable spectral structure, ripple density resolution in the test signal was 51.0 cycles/octave in controls, 16.7 cycles/octave with the flat additional signal, and 11.0–11.1 cycles/octave with the additional signal with ripple density 2–7 cycles/ octave; the differences of all values from controls were statistically significant. It follows from these data that superimposition of the additional signal induced effects linked with the spectral pattern of the additional signal, these effects being different for the spectral and temporal mechanisms of frequency analysis involved in signal discrimination.
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Translated from Sensornye Sistemy, Vol. 35, No. 3, pp. 228–235, July–August, 2021.
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Tomozova, M.S., Nechaev, D.I., Milekhina, O.N. et al. Discrimination of Sound Signals with Rippled Spectra in the Presence of Additional Signals. Neurosci Behav Physi 52, 158–163 (2022). https://doi.org/10.1007/s11055-022-01216-4
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DOI: https://doi.org/10.1007/s11055-022-01216-4