![]() Many measurements of image positions of stimuli have been made. This paper reports direct measurements of the statistical properties of P. It was assumed to represent all of the information necessary to predict performance in binaural lateralization, interaural discrimination, and binaural detection tasks. P was a unidimensional position variable specified statistically as having a Gaussian distribution. This position is symbolized in this paper as “P,” the intracranial position represented in degrees corresponding to the azimuth angle. One such model, the position-variable model described by Stern and Colburn (1978), generated a statistica1 variable assumed to be monotonically related to subjective lateral image position. Such models (see Colburn, 1995) have frequently used some form of cross-correlation of the inputs to the two ears to generate predictions of performance. Many binaural models have been concerned with how lateral positions of subjective images depend on interaural differences of the stimuli. The results suggest that the most important noise limiting performance originates central to brainstem coincidence detector networks. Near either ear they were skewed toward the midline. Near the midline the position distributions were skewed ipsilaterally. The standard deviation increased as the mean moved laterally from midline. The position distribution variance and skewness depended on the mean of the position distribution, not on the interaural phase difference of the stimulus. ![]() The monaural-reference shifted the position distributions toward the opposite side of the head. Results are reported for listeners’ judgments of intracranial sound image lateral positions in response to binaural tone burst stimuli (250 Hz, 50 ms) with varying interaural phase differences, conditional on the absence or presence of a (left or right) reference monaural tone burst (also 250 Hz, 50 ms) ending 500 ms prior to the test signal. This experiment was designed to yield precise measures of the statistical properties of perceived sound images.
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