Discrimination of the dynamic properties of sound source spatial location in humans: Electrophysiology and psychophysics |
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Authors: | J A Altman S Ph Vaitulevich E A Petropavlovskaia L B Shestopalova |
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Institution: | 1.Pavlov Institute of Physiology,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | The spatial resolution of the human auditory system was studied under conditions, where the location of the sound source was
changed according to different temporal patterns of interaural time delay. Two experimental procedures were run in the same
group of subjects: a psychophysical procedure (the transformed staircase method) and an electrophysiological one (which requires
recording of mismatch negativity, the auditory evoked response component). It was established that (1) the value of the mismatch
negativity reflected the degree of spatial deviation of the sound source; (2) the mismatch negativity was elicited even at
minimum (20μs) interaural time delays under both temporal patterns (abrupt azimuth change and gradual sound movement at different
velocities); (3) an abrupt change of the sound source azimuth resulted in a greater mismatch negativity than gradual sound
movement did if the interaural time delay exceeded 40 μs; (4) the discrimination threshold values of the interaural delay
obtained in the psychophysical procedure were greater than the minimum interaural delays that elicited mismatch negativity,
with the exception of the expert listeners, who exhibited no significant difference. |
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Keywords: | |
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