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Developmental plasticity in the cent...

Halvorsen, Michele Beth.

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Developmental plasticity in the central auditory system of the Mongolian gerbil.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Developmental plasticity in the central auditory system of the Mongolian gerbil./
Author:	Halvorsen, Michele Beth.
Description:	151 p.
Notes:	Adviser: Thomas J. Park.
Contained By:	Dissertation Abstracts International64-03B.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083863

Developmental plasticity in the central auditory system of the Mongolian gerbil.
Halvorsen, Michele Beth.

Developmental plasticity in the central auditory system of the Mongolian gerbil. - 151 p.

Adviser: Thomas J. Park.

Thesis (Ph.D.)--University of Illinois at Chicago, 2003.

Interaural intensity differences (IIDs) are salient localization cues for high frequency sounds because the head acts as an acoustic barrier to wavelengths shorter than the head's diameter. Because head diameter changes with maturation, IIDs generated by the head also change. The goal of our experiments was to determine if the IID sensitivity of central auditory neurons differed between adult and juvenile animals. In addition, to determine how rapidly IID sensitivity might change, we used a monaural earplug on juvenile animals. We compared 20–25 day-old juvenile with adult gerbils, and we compared normal juveniles (20–25 days old) with juveniles (20–25 days old) that were raised with an earplug.Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Developmental plasticity in the central auditory system of the Mongolian gerbil.
LDR:03078nam 2200289 a 45 001 935778
005 20110510
008 110510s2003 eng d
035 $a (UnM)AAI3083863
035 $a AAI3083863
040 $a UnM $c UnM
100 1 $a Halvorsen, Michele Beth. $3 1259482
245 1 0 $a Developmental plasticity in the central auditory system of the Mongolian gerbil.
300 $a 151 p.
500 $a Adviser: Thomas J. Park.
500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1112.
502 $a Thesis (Ph.D.)--University of Illinois at Chicago, 2003.
520 $a Interaural intensity differences (IIDs) are salient localization cues for high frequency sounds because the head acts as an acoustic barrier to wavelengths shorter than the head's diameter. Because head diameter changes with maturation, IIDs generated by the head also change. The goal of our experiments was to determine if the IID sensitivity of central auditory neurons differed between adult and juvenile animals. In addition, to determine how rapidly IID sensitivity might change, we used a monaural earplug on juvenile animals. We compared 20–25 day-old juvenile with adult gerbils, and we compared normal juveniles (20–25 days old) with juveniles (20–25 days old) that were raised with an earplug.
520 $a Average head diameter for juveniles was 18 mm vs. 25 mm for adults. Free-field measures showed that IIDs generated at the head differed for adults and juveniles with substantial IIDs generated above 12 kHz by adult heads and above 18 kHz by juvenile heads. In the central auditory system, many cells are sensitive to IIDs in that they are excited by stimulation of one ear and inhibited by stimulation of the other. Hence, response magnitude depends on the relative strengths of the two inputs, which in turn depends on the sound intensities at the ears. We assessed IID sensitivity of neurons in the inferior colliculus using extracellular recordings. Comparison of IID functions for adult and juvenile cells showed differences that were consistent with the head sizes of the different age groups, suggesting that the cells adjust their sensitivity with maturation.
520 $a If IID sensitivity is mediated by experience, then IID sensitive cells in the monaurally occluded animals should acclimate to the altered cues. The earplugs were in place at 10 days, until the day of recording. The results show there were differences in both monaural and binaural responses between the normal juveniles and the plugged juveniles. In general, the results indicate that changes in sensitivity were relatively slower than we expected. Furthermore, both populations included many cells sensitive to IIDs outside of the biologically relevant range of IIDs generated in free field.
590 $a School code: 0799.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Biology, Neuroscience. $3 1017680
690 $a 0317
690 $a 0433
710 2 0 $a University of Illinois at Chicago. $3 1020478
773 0 $t Dissertation Abstracts International $g 64-03B.
790 $a 0799
790 1 0 $a Park, Thomas J., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083863