11-15-11 Sound Localization and Auditory Scene Analysis

11-15-11 Sound Localization and Auditory Scene Analysis -...

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PSY402 Sensation and Perception November 15, 2011 Sound localization and auditory scene analysis Auditory space: Auditory space : Surrounds an observer and exists where there is sound Basic terms describing egocentric space: o Azimuth : Position left to right o Elevation : Position up and down o Distance : Position from observer Auditory localization On average, people can localize sounds: o Directly in front of them most accurately o To the sides and behind their heads least accurately Problem: No spatial information at receptor Binaural cues: Location cues based on the comparison of signals received by left and right ears Interaural time difference (ITD) ITD : Difference between the times sounds reach the two ears Interaural level difference (ILD) ILD : Difference in sound pressure level reaching the two ears o Reduction in intensity for the far ear The head casts an acoustic shadow Works for high frequency >3 KHz Monoaural cue for sound location The pinna and head affect the intensities of frequencies. Spectral cue: The information for location comes from the spectrum of frequencies. Judging elevation
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11-15-11 Sound Localization and Auditory Scene Analysis -...

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