Binaural loudness summation as a function of interaural phase angle

1981 ◽  
Vol 70 (S1) ◽  
pp. S105-S106
Author(s):  
B. E. Mulligan ◽  
L. S. Goodman
Keyword(s):  
Phase Angle ◽  
Interaural Phase ◽  
Loudness Summation

Binaural interaction in low-frequency neurons in inferior colliculus of the cat. II. Effects of changing rate and direction of interaural phase

1983 ◽  
Vol 50 (4) ◽  
pp. 1000-1019 ◽  
Author(s):  
T. C. Yin ◽  
S. Kuwada
Keyword(s):  
Phase Change ◽  
Inferior Colliculus ◽  
Phase Angle ◽  
Beat Frequency ◽  
Free Field ◽  
Rate Of Change ◽  
Phase Changes ◽  
Phase Sensitivity ◽  
Interaural Phase ◽  
The Mean

We used the binaural beat stimulus to study the interaural phase sensitivity of inferior colliculus (IC) neurons in the cat. The binaural beat, produced by delivering tones of slightly different frequencies to the two ears, generates continuous and graded changes in interaural phase. Over 90% of the cells that exhibit a sensitivity to changes in the interaural delay also show a sensitivity to interaural phase disparities with the binaural beat. Cells respond with a burst of impulses with each complete cycle of the beat frequency. The period histogram obtained by binning the poststimulus time histogram on the beat frequency gives a measure of the interaural phase sensitivity of the cell. In general, there is good correspondence in the shapes of the period histograms generated from binaural beats and the interaural phase curves derived from interaural delays and in the mean interaural phase angle calculated from them. The magnitude of the beat frequency determines the rate of change of interaural phase and the sign determines the direction of phase change. While most cells respond in a phase-locked manner up to beat frequencies of 10 Hz, there are some cells tht will phase lock up to 80 Hz. Beat frequency and mean interaural phase angle are linearly related for most cells. Most cells respond equally in the two directions of phase change and with different rates of change, at least up to 10 Hz. However, some IC cells exhibit marked sensitivity to the speed of phase change, either responding more vigorously at low beat frequencies or at high beat frequencies. In addition, other cells demonstrate a clear directional sensitivity. The cells that show sensitivity to the direction and speed of phase changes would be expected to demonstrate a sensitivity to moving sound sources in the free field. Changes in the mean interaural phase of the binaural beat period histograms are used to determine the effects of changes in average and interaural intensity on the phase sensitivity of the cells. The effects of both forms of intensity variation are continuously distributed. The binaural beat offers a number of advantages for studying the interaural phase sensitivity of binaural cells. The dynamic characteristics of the interaural phase can be varied so that the speed and direction of phase change are under direct control. The data can be obtained in a much more efficient manner, as the binaural beat is about 10 times faster in terms of data collection than the interaural delay.

Auditory cortex lesions and interaural intensity and phase-angle discrimination in cats

1979 ◽  
Vol 42 (6) ◽  
pp. 1518-1526 ◽  
Author(s):  
J. L. Cranford
Keyword(s):  
Phase Angle ◽  
Sound Localization ◽  
Present Experiment ◽  
Active Avoidance ◽  
Spatial Separation ◽  
Sound Sources ◽  
Detection Thresholds ◽  
Interaural Phase ◽  
Interaural Differences ◽  
Angle Discrimination

1. A currently unresolved question concerning the effects of auditory decortication on sound localization is whether or not operated animals have a normal capacity for discriminating the small interaural differences in phase angle or intensity that result from the spatial separation of sound sources relative to the head. The present experiment was designed to provide data relevant to this question. 2. Four normal and three operated cats (bilateral ablations of AI, AII Ep, SII, I-T), wearing stereo headsets, were tested with an active avoidance procedure to detect reversals in the interaural phase-angle or intensity relations of binaural 1-kHz tones. For both groups of cats, the detection thresholds for interaural intensity and phase angle were found to be close to 1 dB and 5 degrees, respectively. 3. In addition, we found that both unoperated and operated cats exhibited positive transfer from the original lateralization task involving the detection of interaural reversals of phase angle or intensity to a new test, which required the cats to identify, in an absolute sense, which ear received the leading or louder signals. 4. Thus, the present investigation provides additional evidence that the neocortex has no primary sensory role in sound localization.

Binaural Threshold and Interaural Phase Angle Differences

1970 ◽  
Vol 48 (1A) ◽  
pp. 85-86
Author(s):  
Sanford E. Gerber ◽  
Phyllis G. Jaffe ◽  
Brownyn J. Alford
Keyword(s):  
Phase Angle ◽  
Interaural Phase

Study of body composition and phase angle in relation to nutritional parameters in patients with neuroendocrine tumors

2019 ◽  
Author(s):  
Carmen Hernandez-Garcia ◽  
Isabel Maria Cornejo-Pareja ◽  
Miguel Damas-Fuentes ◽  
Jose Ignacio Martinez-Montoro ◽  
Cristina Maria Diaz-Perdigones ◽  
...  
Keyword(s):  
Body Composition ◽  
Phase Angle ◽  
Neuroendocrine Tumors ◽  
Nutritional Parameters

Descriptive analysis of body composition and phase angle (PA) in achondroplastic patients: Case-control study

2020 ◽  
Author(s):  
Vegas-Aguilar Isabel Mª ◽  
Cornejo Pareja Isabel Maria ◽  
Gea Antonio Leiva ◽  
Francisco J Tinahones ◽  
García-Almeida Jose Manuel
Keyword(s):  
Body Composition ◽  
Phase Angle ◽  
Case Control Study ◽  
Descriptive Analysis ◽  
Case Control ◽  
Control Study

METHOD FOR ESTIMATING PARAMETERS OF GENERALIZED MODEL OF LUMINOSITY OF SPACE OBJECTS BASED ON DATA FROM DIFFERENT RANGES

2018 ◽  
pp. 57-62
Author(s):  
E. I. Gundrova ◽  
A. P. Lukyanov ◽  
A. V. Pruglo ◽  
S. S. Ravdin
Keyword(s):  
Phase Angle ◽  
Real Data ◽  
Model Data ◽  
Space Object ◽  
Distribution Law ◽  
Generalized Model ◽  
Measurement Results ◽  
Space Objects ◽  
Reference Distance

Previously, the authors have proposed a generalized model for estimating the distribution law parameters of luminosity of space objects, assuming that not only successful but also unsuccessful measurement results are taken into account. Estimation was done on the data of observations under similar conditions: phase angle, range, sensibility of the telescope. The algorithm under such limitations was tested on model data and real measurements. Therefore, obtained results showed that algorithm did not fit for cases of changing range of space objects. In this work, the new algorithm, that allows to merge information from different ranges to the observed space object, is proposed. In this case, luminosity values are reduced to the ones at a reference distance of 1000 km considering sensibility of the telescope. To obtain estimates of the parameters the Cramer-Mises-Smirnov criterion is used. This algorithm was tested on model data and results of its work on real data were obtained. The data showed correct work of the algorithm and also confirmed the practicability of organization the registration of unsuccessful measurements.

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