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Nonphotic entrainment of circadian r...

Goel, Namni.

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Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration./
Author:	Goel, Namni.
Description:	283 p.
Notes:	Source: Dissertation Abstracts International, Volume: 57-11, Section: B, page: 7267.
Contained By:	Dissertation Abstracts International57-11B.
Subject:	Psychology, Psychobiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9711972
ISBN:	0591194538

Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration.
Goel, Namni.

Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration. - 283 p.

Source: Dissertation Abstracts International, Volume: 57-11, Section: B, page: 7267.

Thesis (Ph.D.)--University of Michigan, 1996.

Circadian rhythms are self-sustained biological rhythms entrained to a 24-hour period by an organism's natural environment. A majority of studies examining the entrainment of circadian rhythms have concentrated on the role of geophysical factors, such as light intensity, as entrainers or zeitgebers. However, other stimuli, including social cues, can serve as nonphotic zeitgebers for entrainment in animals housed in constant (free-running) conditions. To truly evaluate the usefulness of nonphotic zeitgebers and their possible functional significance, one must demonstrate that these cues exert independent effects on biological rhythms in the presence of a light-dark cycle. Thus far, the significance of only a few nonphotic zeitgebers has been tested under photic conditions. In addition, animal models of social entrainment have been developed in either nocturnal (night-active), asocial species or birds that do not live in groups during much of the year.

ISBN: 0591194538Subjects--Topical Terms:

1017821
Psychology, Psychobiology.

Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration.
LDR:03426nmm 2200325 4500 001 1817800
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020 $a 0591194538
035 $a (UnM)AAI9711972
035 $a AAI9711972
040 $a UnM $c UnM
100 1 $a Goel, Namni. $3 1907145
245 1 0 $a Nonphotic entrainment of circadian rhythms in the diurnal rodent, Octodon degus: Behavioral and neuroanatomical integration.
300 $a 283 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-11, Section: B, page: 7267.
500 $a Chair: Theresa M. Lee.
502 $a Thesis (Ph.D.)--University of Michigan, 1996.
520 $a Circadian rhythms are self-sustained biological rhythms entrained to a 24-hour period by an organism's natural environment. A majority of studies examining the entrainment of circadian rhythms have concentrated on the role of geophysical factors, such as light intensity, as entrainers or zeitgebers. However, other stimuli, including social cues, can serve as nonphotic zeitgebers for entrainment in animals housed in constant (free-running) conditions. To truly evaluate the usefulness of nonphotic zeitgebers and their possible functional significance, one must demonstrate that these cues exert independent effects on biological rhythms in the presence of a light-dark cycle. Thus far, the significance of only a few nonphotic zeitgebers has been tested under photic conditions. In addition, animal models of social entrainment have been developed in either nocturnal (night-active), asocial species or birds that do not live in groups during much of the year.
520 $a Circadian rhythms are generated and regulated by the neural circadian timing system, which includes retinal pathways coupled to a pacemaker in the brain, the pacemaker itself, as well as those structures which are efferents from and afferents to the pacemaker. Collectively, our knowledge of the circadian timing system and the behavioral and neuroanatomical components of nonphotic and photic entrainment is derived virtually exclusively from two nocturnal species, rats and hamsters. Furthermore, little data have been collected in diurnal (day-active) mammals.
520 $a The experiments in this dissertation investigate social cues and their potential effects on circadian rhythms in the communal-living, diurnal rodent, Octodon degus. The dissertation examines the strong response of females, but not males, to social zeitgebers; determines that olfactory cues are critical for social effects; describes the degu neural circadian timing system; and characterizes the essential function of the olfactory bulbs and the minimal role of the intergeniculate leaflet of the thalamus in mediating social information to the biological clock. In addition, the dissertation includes a comparison of data in degus to those available for nocturnal rodents.
520 $a The results provide provocative evidence that rodent species differ in the neural structures, pathways and specific cues used to transduce nonphotic information to the biological clock and thereby regulate circadian rhythms.
590 $a School code: 0127.
650 4 $a Psychology, Psychobiology. $3 1017821
650 4 $a Biology, Neuroscience. $3 1017680
650 4 $a Biology, Animal Physiology. $3 1017835
690 $a 0349
690 $a 0317
690 $a 0433
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 57-11B.
790 1 0 $a Lee, Theresa M., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9711972