Light intensity and splitting in the golden hamster

Gary E. Pickard; Fred W. Turek; Patricia J. Sollars

doi:10.1016/0031-9384(93)90035-E

Light intensity and splitting in the golden hamster

Gary E. Pickard^*, Fred W. Turek, Patricia J. Sollars

^*Corresponding author for this work

Neurobiology

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Hamster circadian activity rhythms split into two components during prolonged exposure to conditions of constant light (LL). Several aspects of this phenomenon were examined in this study. The frequency of splitting was significantly greater among animals exposed to LL of 100 lux intensity (LL₁₀₀) compared with animals in LL₁₀. Animals that split had significantly longer free-running periods (τ) compared to nonsplitters and the decrease in τ associated with splitting was highly correlated with the presplit τ. Splitting was also observed under continuous dim light which fluctuated rhythmically from 5-10 lux. Thus, splitting of the circadian rhythm of activity is positively correlated with LL intensity with an LL intensity threshold for the induction of splitting in the range of 3-5 lux.

Original language	English (US)
Pages (from-to)	1-5
Number of pages	5
Journal	Physiology and Behavior
Volume	54
Issue number	1
DOIs	https://doi.org/10.1016/0031-9384(93)90035-E
State	Published - Jul 1993

Keywords

Circadian rhythms
Hamsters
Light intensity
Splitting

ASJC Scopus subject areas

Experimental and Cognitive Psychology
Behavioral Neuroscience

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10.1016/0031-9384(93)90035-E

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title = "Light intensity and splitting in the golden hamster",

abstract = "Hamster circadian activity rhythms split into two components during prolonged exposure to conditions of constant light (LL). Several aspects of this phenomenon were examined in this study. The frequency of splitting was significantly greater among animals exposed to LL of 100 lux intensity (LL100) compared with animals in LL10. Animals that split had significantly longer free-running periods (τ) compared to nonsplitters and the decrease in τ associated with splitting was highly correlated with the presplit τ. Splitting was also observed under continuous dim light which fluctuated rhythmically from 5-10 lux. Thus, splitting of the circadian rhythm of activity is positively correlated with LL intensity with an LL intensity threshold for the induction of splitting in the range of 3-5 lux.",

keywords = "Circadian rhythms, Hamsters, Light intensity, Splitting",

author = "Pickard, {Gary E.} and Turek, {Fred W.} and Sollars, {Patricia J.}",

note = "Funding Information: We are grateful to Greg Maishn for providing statisttcal assistance. This work was supported by PHS grants NS 21165 and MH 47501 to G E.P.",

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T1 - Light intensity and splitting in the golden hamster

AU - Pickard, Gary E.

AU - Turek, Fred W.

AU - Sollars, Patricia J.

N1 - Funding Information: We are grateful to Greg Maishn for providing statisttcal assistance. This work was supported by PHS grants NS 21165 and MH 47501 to G E.P.

PY - 1993/7

Y1 - 1993/7

N2 - Hamster circadian activity rhythms split into two components during prolonged exposure to conditions of constant light (LL). Several aspects of this phenomenon were examined in this study. The frequency of splitting was significantly greater among animals exposed to LL of 100 lux intensity (LL100) compared with animals in LL10. Animals that split had significantly longer free-running periods (τ) compared to nonsplitters and the decrease in τ associated with splitting was highly correlated with the presplit τ. Splitting was also observed under continuous dim light which fluctuated rhythmically from 5-10 lux. Thus, splitting of the circadian rhythm of activity is positively correlated with LL intensity with an LL intensity threshold for the induction of splitting in the range of 3-5 lux.

AB - Hamster circadian activity rhythms split into two components during prolonged exposure to conditions of constant light (LL). Several aspects of this phenomenon were examined in this study. The frequency of splitting was significantly greater among animals exposed to LL of 100 lux intensity (LL100) compared with animals in LL10. Animals that split had significantly longer free-running periods (τ) compared to nonsplitters and the decrease in τ associated with splitting was highly correlated with the presplit τ. Splitting was also observed under continuous dim light which fluctuated rhythmically from 5-10 lux. Thus, splitting of the circadian rhythm of activity is positively correlated with LL intensity with an LL intensity threshold for the induction of splitting in the range of 3-5 lux.

KW - Circadian rhythms

KW - Hamsters

KW - Light intensity

KW - Splitting

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Light intensity and splitting in the golden hamster

Abstract

Keywords

ASJC Scopus subject areas

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