Ripple Glide Direction Discrimination and Its Relationship to Frequency Selectivity Estimated Using Notched Noise
Experiment 1 evaluated a test of spectral resolution, denoted STRtdir, which estimates the highest ripple density at which stimuli with upward- and downward-gliding spectral ripples can be discriminated. The test was intended to avoid the confounding cues that can occur for other tests using similar stimuli. Mean thresholds for seventeen normal-hearing participants were similar to those obtained by Narne et al.  for the discrimination of static spectral ripples and for the discrimination of dynamic spectral ripples with the spectral edges masked by noise. Experiment 2 assessed whether performance on the STRtdir depended on "local" or "global" frequency selectivity. Participants with both normal and impaired hearing were tested using the STRtdir, and their auditory filter shapes were estimated using the notched-noise method for centre frequencies of 0.5, 1, 2, and 4 kHz. The individual STRtdir thresholds were predicted more accurately using a "local" excitation-pattern model, based on the assumption that the threshold is reached when the peak-to-valley ratio (PVR) in the excitation pattern in any one-octave wide frequency region reaches a criterion value, than by a "global" model based on the assumption that threshold is determined by the average PVR across the whole excitation pattern.
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Document Type: Research Article
Publication date: November 1, 2018
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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