Andrew R. Brughera

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The smallest detectable interaural time difference (ITD) for sine tones was measured for four human listeners to determine the dependence on tone frequency. At low frequencies, 250-700 Hz, threshold ITDs were approximately inversely proportional to tone frequency. At mid-frequencies, 700-1000 Hz, threshold ITDs were smallest. At high frequencies, above 1000(More)
Arbogast et al. [1] found a large release from masking obtained by the spatial separation of a target talker and a competing speech masker. Both signal and masker were sentences from the Coordinate Response Measure corpus processed by extracting the envelopes of 15 narrow frequency bands and using the envelopes to modulate carrier tones at the center of(More)
Many past studies of sound localization explored the precedence effect (PE), in which a pair of brief, temporally close sounds from different directions is perceived as coming from a location near that of the first-arriving sound. Here, a computational model of low-frequency inferior colliculus (IC) neurons accounts for both physiological and psychophysical(More)
A simple, biophysically specified cell model is used to predict responses of binaurally sensitive neurons to patterns of input spikes that represent stimulation by acoustic and electric waveforms. Specifically, the effects of changes in parameters of input spike trains on model responses to interaural time difference (ITD) were studied for low-frequency(More)
We present a simple and reliable method to calibrate respiratory magnetometers and Respitrace to infer respiratory volume changes. As in earlier methods, we assume two degrees of freedom in the chest wall and that volume displacement depends linearly on surface motion at the rib cage and abdomen. Because the area of the rib cage is larger, a given motion of(More)
Many perceptual and physiological studies of sound localization have explored the precedence effect (PE), whereby a pair of brief sounds coming from different directions and arriving at the ears close together in time is perceived as coming from a location near that of the first-arriving sound. Here, we used a computational model of low-frequency inferior(More)
Simultaneous tones that are harmonically related tend to be grouped perceptually to form a unitary auditory image. A partial that is mistuned stands out from the other tones, and harmonic complexes with different fundamental frequencies can readily be perceived as separate auditory objects. These phenomena are evidence for the strong role of harmonicity in(More)
The Sensory Communication Group continues to be a highly interdisciplinary group (containing engineers, psychologists, and now a physicist) and to be concerned with basic research on human sensorimotor, perceptual, and cognitive processes, as well as with the use of technology to enhance human performance. In contrast to many other groups at MIT concerned(More)