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localization of sounds (1).docx

4 Pages
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Department
Psychology
Course Code
PSYCH 2E03
Professor
Gautam Ullal

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November 28th, 2012
Psych 2E03: Sensory Processes
Localization of Sounds (1)
Auditory localization
- on average, people can localize sounds
directly in front of them most accurately
to the sides and behind their heads least accurately
- location cues are not contained in the receptor cells like on the retina in
vision; thus, location for sounds must be calculated
- auditory space surrounds an observer and exists where there is sound
- coordinates:
azimuth coordinates position left to right
elevation coordinates position up and down
distance coordinates position from observer
Cues for localization of sounds (binaural cues)
- interaural time difference (ITD): especially useful for sounds arising from the
horizontal plane
- interaural intensity or level difference (ILD): particularly helpful for high
frequency sounds because they produce acoustic shadows
Cues for sound location
- binaraul cues location cues based on the comparison of the signals received
by the left and right ears
interaural time difference (ITD) difference between the times
sounds reach the two ears
when distance to each ear is the same, there are no differences
in time
when the source is to the side of the observer, the times will
differ

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Description
November 28 , 2012 Psych 2E03: Sensory Processes Localization of Sounds (1) Auditory localization - on average, people can localize sounds  directly in front of them most accurately  to the sides and behind their heads least accurately - location cues are not contained in the receptor cells like on the retina in vision; thus, location for sounds must be calculated - auditory space – surrounds an observer and exists where there is sound - coordinates:  azimuth coordinates – position left to right  elevation coordinates – position up and down  distance coordinates – position from observer Cues for localization of sounds (binaural cues) - interaural time difference (ITD): especially useful for sounds arising from the horizontal plane - interaural intensity or level difference (ILD): particularly helpful for high frequency sounds because they produce acoustic shadows Cues for sound location - binaraul cues – location cues based on the comparison of the signals received by the left and right ears  interaural time difference (ITD) – difference between the times sounds reach the two ears  when distance to each ear is the same, there are no differences in time  when the source is to the side of the observer, the times will differ Binaural cues and the acoustic shadows - interarual level difference (ILD) – difference in sound pressure level reaching the two ears  reduction in intensity occurs for high frequency sounds for the far ear  the head cast
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