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Directionality of sound pressure transformation at the cat's pinna
Citation
Phillips, DP and Calford, MB and Pettigrew, JD and Aitkin, LM and Semple, MN, Directionality of sound pressure transformation at the cat's pinna, Hearing Research, 8, (1) pp. 13-28. ISSN 0378-5955 (1982) [Refereed Article]
DOI: doi:10.1016/0378-5955(82)90031-4
Abstract
The directionality of the cat's pinna was studied by using the amplitude of the cochlear microphonic (CM) as a quantitative indicator of tympanic sound pressure level (SPL). It was found that tympanic SPL varied with the location of a free field stimulator in anechoic space. For high (tonal) frequencies, there was a circumscribed optimal area for tympanic SPL in the frontal ipsilateral sound field, in confirmation of previous findings with other techniques that the pinna has an acoustical axis. The directionality of the pinna, determined from the solid angle enclosed by the 5 dB isointensity-decrement line with respect to the optimal position, increased with frequency. For low tonal frequencies, no circumscribed optimal area in the frontal sound field could be distinguished, and tympanic SPL fell by only 10-12 dB for displacements of 90° into the contralateral sound field. Excision of the pinna abolished the circumscribed optimal areas for tympanic SPL and revealed the pinna produces up to 28 dB amplification of acoustic signals delivered 'on-axis'. © 1982.
Item Details
Item Type: | Refereed Article |
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Keywords: | cochlear microphonic; pinna; sound localization; sound pressure transformation; animal experiment; auditory system; cat; cochlea potential; etiology; external ear; sound detection; Animals; Auditory Perception; Cats; Ear, External |
Research Division: | Biomedical and Clinical Sciences |
Research Group: | Neurosciences |
Research Field: | Neurology and neuromuscular diseases |
Objective Division: | Health |
Objective Group: | Clinical health |
Objective Field: | Clinical health not elsewhere classified |
UTAS Author: | Calford, MB (Professor Mike Calford) |
ID Code: | 91245 |
Year Published: | 1982 |
Web of Science® Times Cited: | 117 |
Deposited By: | Research Division |
Deposited On: | 2014-05-13 |
Last Modified: | 2014-05-13 |
Downloads: | 0 |
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