Abstract
Sound movement: The dynamics of interaural amplitude and phase modulation processing are different
The Journal of the Acoustical Society of America, Vol.104(3_Supplement), pp.1798-1798
09/01/1998
DOI: 10.1121/1.423557
Abstract
Listeners use two binaural cues when detecting motion of a sound in the horizontal plane; interaural amplitude and phase modulation (IAM and IPM). It has been suggested that IAM is converted into the same neural code as IPM, in which case the dynamics of IAM and IPM processing should be the same. To test this hypothesis, three subjects participated in 2-AFC psychophysical experiments. Thresholds were measured for detection and modulation-direction discrimination of linear IAM and IPM of a 500 Hz tone, for ramp durations between 20 and 1000 ms. At durations between 200 and 1000 ms detection thresholds for both cues remained constant. IAM sensitivity decreased in a biphasic manner at durations below 200 ms, whereas IPM sensitivity remained constant until much shorter durations (60 ms). This suggests that IAM detection has a longer integration period than IPM detection. Discrimination thresholds for IAM were 3 to 4 times smaller than detection thresholds (mean ratio 0.29, s.d.=0.04, n=3). IPM discrimination thresholds were similar to IPM detection thresholds (mean ratio 0.81, s.d.=0.05, n=3). These results demonstrate that the dynamics of IAM and IPM processing are not the same, and the hypothesis is rejected.
Details
- Title: Subtitle
- Sound movement: The dynamics of interaural amplitude and phase modulation processing are different
- Creators
- Caroline Witton - Newcastle UniversityAdrian Rees - Newcastle UniversityB. Vishwanatha Rao - Newcastle UniversityTimothy D. Griffiths - Newcastle UniversityGary G. R. Green
- Resource Type
- Abstract
- Publication Details
- The Journal of the Acoustical Society of America, Vol.104(3_Supplement), pp.1798-1798
- DOI
- 10.1121/1.423557
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Language
- English
- Date published
- 09/01/1998
- Academic Unit
- Psychological and Brain Sciences
- Record Identifier
- 9984632146602771
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