Functional development of the inferior colliculus and its relationship with the auditory brainstem response in the tammar wallaby (Macropus eugenii)

Liu, Guang B. and Mark, Richard F. (2001) Functional development of the inferior colliculus and its relationship with the auditory brainstem response in the tammar wallaby (Macropus eugenii). Hearing Research, 157 (1-2). pp. 112-123. ISSN 0378-5955

Abstract

To discover the developmental relationship between the auditory brainstem response (ABR) and the focal inferior colliculus (IC) response, 32 young tammar wallabies were used, by the application of simultaneous ABR and focal brainstem recordings, in response to acoustic clicks and tone bursts of seven frequencies. The IC of the tammar wallaby undergoes a rapid functional development from postnatal day (PND) 114 to 160. The earliest (PND 114) auditory evoked response was recorded from the rostral IC. With development, more caudal parts of the IC became functional until age about PND 127, when all parts of the IC were responsive to sound. Along a dorsoventral direction, the duration of the IC response decreased, the peak latency shortened, while the amplitude increased, reaching a maximum value at the central IC, then decreased. After PND 160, the best frequency (BF) of the ventral IC was the highest, with values between 12.5 and 16 kHz, the BF of the dorsal IC was the lowest, varying between 3.2 and 6.4 kHz, while the BF of the central IC was between 6.4 and 12.5 kHz. Between PND 114 and 125, the IC response did not have temporal correlation with the ABR. Between PND 140 and 160, only the early components of the responses from the ventral and central IC correlated with the P4 waves of the ABR. After PND 160, responses recorded from different depths of the IC had a temporal correlation with the ABR.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright © 2001.
Depositing User: Dr Guang Liu
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 22 Apr 2008 05:51
Last Modified: 17 Sep 2013 05:19
Uncontrolled Keywords: auditory brainstem response; Tammar wallaby; inferior colliculus
Fields of Research (FOR2008): 11 Medical and Health Sciences > 1109 Neurosciences > 110906 Sensory Systems
11 Medical and Health Sciences > 1109 Neurosciences > 110903 Central Nervous System
06 Biological Sciences > 0608 Zoology > 060805 Animal Neurobiology
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970111 Expanding Knowledge in the Medical and Health Sciences
Identification Number or DOI: doi: 10.1016/S0378-5955(01)00289-1
URI: http://eprints.usq.edu.au/id/eprint/3227

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