Journal ArticleDOI
Detection of sinusoidal amplitude modulation at unexpected rates
Beverly A. Wright,Huanping Dai +1 more
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TLDR
The detectability of sinusoidal amplitude modulation at unexpected modulation rates was assessed using a probe-signal method and the influence of expectation of modulation rate on the detection of Sinusoidal Amplitude modulation is not readily predicted by current models of modulation detection.Abstract:
The detectability of sinusoidal amplitude modulation at unexpected modulation rates was assessed using a probe-signal method. With this method, three listeners were led to expect a target modulation rate (4, 32, or 256 Hz) by presenting the signal most often at that rate, and sensitivity to modulation at six other unexpected rates between 4 and 256 Hz was measured via occasionally presented probe modulation rates. The modulation phase was random on each two-interval forced-choice trial and the overall level of the 500-ms broadband carrier was randomly varied between 55 and 75 dB SPL across intervals. The modulation depth at each rate was set so that the modulation was detected on about 90% of the trials when only that rate was presented. Performance at the unexpected rates depended upon the target rate. For the 4-Hz target, modulation at all rates was detected on about 80% of the trials. For the 32- and 256-Hz targets, unexpected modulation rates of 16 Hz and above were detected on 80%–90% of the trials, but modulation rates below 16 Hz were detected nearly at chance. The influence of expectation of modulation rate on the detection of sinusoidal amplitude modulation is not readily predicted by current models of modulation detection.read more
Citations
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The advantage of knowing where to listen
TL;DR: The results of the current experiments suggest that the focus of attention along the spatial dimension can play a very significant role in solving the "cocktail party" problem.
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Tuning in the spatial dimension: Evidence from a masked speech identification task
TL;DR: Overall, the spatial tuning observed appears to depend on the presence of interaural differences that improve the perceptual segregation of sources and facilitate the focus of attention at a point in space.
Journal ArticleDOI
Forward masking of amplitude modulation: basic characteristics.
TL;DR: An effect for amplitude modulation (AM) that is analogous to forward making of audio frequencies, i.e., the modulation threshold for detection of AM (signal) is raised by preceding AM (masker), is demonstrated.
Journal ArticleDOI
The time course of attention in a simple auditory detection task
TL;DR: The detectability of a 20-msec, 1000-Hz tone presented at expected and unexpected times is determined, and humans seem to listen specifically for that sound, while ignoring the background in which it is presented, around the time when the sound is expected to occur.
Journal ArticleDOI
A perceptual learning investigation of the pitch elicited by amplitude-modulated noise.
TL;DR: It is indicated that listeners can learn to improve their ability to discriminate SAM rate with multiple-hour training and that the mechanism that is modified by learning encodes the pitch of SAM noise but not that of pure tones and rippled noise, and differences in SAM rate more effectively than cues for SAM detection.
References
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Journal ArticleDOI
Transformed Up‐Down Methods in Psychoacoustics
TL;DR: A broad class of up‐down methods used in psychoacoustics with due emphasis on the related problems of parameter estimation and the efficient placing of observations is described, including examples where conventional techniques are inapplicable.
Journal ArticleDOI
Temporal modulation transfer functions based upon modulation thresholds
TL;DR: Although the TMTFs are not directly consistent with the attenuation characteristic of a simple lowpass filter, a model which incorporates such a filter, with a time constant of 2.5 ms, describes the entire TMTF and also describes the modulation functions obtained with square-wave and pulse modulation.
Journal ArticleDOI
Representation of amplitude modulation in the auditory cortex of the cat. II. Comparison between cortical fields.
TL;DR: There are significant differences between auditory cortex fields with respect to their temporal response characteristics and the assessment of these response characteristics reveals important aspects of the functional significance of auditory cortical fields for the coding and representation of complex sounds.
Journal ArticleDOI
Frequency‐Response Characteristic of Auditory Observers Detecting Signals of a Single Frequency in Noise: The Probe‐Signal Method
TL;DR: Four experiments were conducted to develop and test a method of determining the frequency‐response characteristic of the observer when he listens for single‐frequency signals presented against a continuous background of wide‐band noise.
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