Masking of rippled-spectrum-pattern resolution in diotic and dichotic presentations

Supin, Alexander Ya.; Vv, Popov; Milekhina, Olga N.; Tarakanov, Mikhail B.

doi:10.1016/j.heares.2009.12.018

Cited by 5 publications

(3 citation statements)

References 56 publications

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“… 55 , 80-85 Recent investigations have shown that the release of SRP is an important factor of both ILD-based and BMLD-based release from masking. 86 In conditions of dichotic presentation (the probe in one ear and the masker in the other ear), SRP remained almost the same as in control no-masker conditions, even at very high masker/probe ratios ( Figure 7 ). Thus, almost complete ILD-based release from masking took place both for on-frequency and off-frequency maskers.…”

Section: Introductionmentioning

confidence: 78%

Spectrum Resolving Power of Hearing: Measurements, Baselines, and Influence of Maskers

Supin

2011

Audiology Research

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Contemporary methods of measurement of frequency resolving power in the auditory system are reviewed. Majority of classical methods are based on the frequency-selective masking paradigm and require multi-point measurements (a number of masked thresholds should be measured to obtain a single frequency-tuning estimate). Therefore, they are rarely used for practical needs. As an alternative approach, frequency-selective properties of the auditory system may be investigated using probes with complex frequency spectrum patterns, in particular, rippled noise that is characterized by a spectrum with periodically alternating maxima and minima. The maximal ripple density discriminated by the auditory system is a convenient measure of the spectrum resolving power (SRP). To find the highest resolvable ripple density, a phase-reversal test has been suggested. Using this technique, normal SRP, its dependence on probe center frequency, spectrum contrast, and probe level were measured. The results were not entirely predictable by frequency-tuning data obtained by masking methods. SRP is influenced by maskers, with on- and off-frequency maskers influencing SRP very differently. Dichotic separation of the probe and masker results in almost complete release of SRP from influence of maskers.

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Section: Introductionmentioning

confidence: 78%

Spectrum Resolving Power of Hearing: Measurements, Baselines, and Influence of Maskers

Supin

2011

Audiology Research

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“…At the final step of the routine, the synthetized signals were adjusted to the desirable root-mean-square value. In more detail, the generation routine was described earlier (Nechaev & Supin, 2013;Supin, Popov, Milekhina, & Tarakanov, 2010).…”

Section: Stimulus Generationmentioning

confidence: 99%

Estimates of Ripple-Density Resolution Based on the Discrimination From Rippled and Nonrippled Reference Signals

2019

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Rippled-spectrum stimuli are used to evaluate the resolution of the spectro-temporal structure of sounds. Measurements of spectrum-pattern resolution imply the discrimination between the test and reference stimuli. Therefore, estimates of rippled-pattern resolution could depend on both the test stimulus and the reference stimulus type. In this study, the ripple-density resolution was measured using combinations of two test stimuli and two reference stimuli. The test stimuli were rippled-spectrum signals with constant phase or rippled-spectrum signals with ripple-phase reversals. The reference stimuli were rippled-spectrum signals with opposite ripple phase to the test or nonrippled signals. The spectra were centered at 2 kHz and had an equivalent rectangular bandwidth of 1 oct and a level of 70 dB sound pressure level. A three-alternative forced-choice procedure was combined with an adaptive procedure. With rippled reference stimuli, the mean ripple-density resolution limits were 8.9 ripples/oct (phase-reversals test stimulus) or 7.7 ripples/oct (constant-phase test stimulus). With nonrippled reference stimuli, the mean resolution limits were 26.1 ripples/oct (phase-reversals test stimulus) or 22.2 ripples/ oct (constant-phase test stimulus). Different contributions of excitation-pattern and temporal-processing mechanisms are assumed for measurements with rippled and nonrippled reference stimuli: The excitation-pattern mechanism is more effective for the discrimination of rippled stimuli that differ in their ripple-phase patterns, whereas the temporal-processing mechanism is more effective for the discrimination of rippled and nonrippled stimuli.

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“…Quantifying sensitivity as the highest modulation rate supporting modulation phase reversal, they showed more masking for an unmodulated band below the target than above the target [ 24 ]. Under some conditions a masker below the target was more effective than an on-frequency masker [ 25 ]. Interestingly, increasing the bandwidth of the low-frequency masker did not introduce more masking–if anything, it decreased masking [ 24 ].…”

Section: Experiments 3: Carrier-frequency-specific Spectral Modulationmentioning

confidence: 99%

Auditory sensitivity to spectral modulation phase reversal as a function of modulation depth

Buss

Grose

2018

PLoS ONE

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The present study evaluated auditory sensitivity to spectral modulation by determining the modulation depth required to detect modulation phase reversal. This approach may be preferable to spectral modulation detection with a spectrally flat standard, since listeners appear unable to perform the task based on the detection of temporal modulation. While phase reversal thresholds are often evaluated by holding modulation depth constant and adjusting modulation rate, holding rate constant and adjusting modulation depth supports rate-specific assessment of modulation processing. Stimuli were pink noise samples, filtered into seven octave-wide bands (0.125–8 kHz) and spectrally modulated in dB. Experiment 1 measured performance as a function of modulation depth to determine appropriate units for adaptive threshold estimation. Experiment 2 compared thresholds in dB for modulation detection with a flat standard and modulation phase reversal; results supported the idea that temporal cues were available at high rates for the former but not the latter. Experiment 3 evaluated spectral modulation phase reversal thresholds for modulation that was restricted to either one or two neighboring bands. Flanking bands of unmodulated noise had a larger detrimental effect on one-band than two-band targets. Thresholds for high-rate modulation improved with increasing carrier frequency up to 2 kHz, whereas low-rate modulation appeared more consistent across frequency, particularly in the two-band condition. Experiment 4 measured spectral weights for spectral modulation phase reversal detection and found higher weights for bands in the spectral center of the stimulus than for the lowest (0.125 kHz) or highest (8 kHz) band. Experiment 5 compared performance for highly practiced and relatively naïve listeners, and found weak evidence of a larger practice effect at high than low spectral modulation rates. These results provide preliminary data for a task that may provide a better estimate of sensitivity to spectral modulation than spectral modulation detection with a flat standard.

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Masking of rippled-spectrum-pattern resolution in diotic and dichotic presentations

Cited by 5 publications

References 56 publications

Spectrum Resolving Power of Hearing: Measurements, Baselines, and Influence of Maskers

Spectrum Resolving Power of Hearing: Measurements, Baselines, and Influence of Maskers

Estimates of Ripple-Density Resolution Based on the Discrimination From Rippled and Nonrippled Reference Signals

Auditory sensitivity to spectral modulation phase reversal as a function of modulation depth

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