Effects of illumination level on the rat's rhythmicity of brain self-stimulation behavior

Behavioural Brain Research
J S Terman, M Terman

Abstract

Rhythmic patterns in the rat's brain self-stimulation behavior were analyzed across levels of illumination, including conditions of constant illumination (LL), constant darkness (DD), and light-dark cycles (LD 12:12). LD entrainment was achieved with light intensities ranging from 0.25 to 440 lux, and little or no change was found in the phase-angle difference between the dominant spectral peak and the light transitions. Under constant conditions, the circadian period (tau) increased in proportion to illumination level, with means ranging from 24.10 h (DD) to 25.90 h (LL 440 lux). tau increased linearly as a function of long I within the range of 0.25 to 30 lux, yielding a change of 0.28 h for a 10-fold increment in illumination level, a value which closely matches Aschoff's [3] preliminary estimate of delta tau/delta ILL for the rat. The circadian spectral component was influenced by several factors. (1) Re-entrainment protocol. Given a succession of LL conditions without entrainment segments in between, circadian rhythmicity was obscured at high illumination levels. (2) Duration of LL exposure. Even following an entrainment segment, long-term LL resulted in reduced power or loss of the circadian component. (3) LD vs LL. Spect...Continue Reading

References

Jun 1, 1975·Physiology & Behavior·M Terman, J S Terman
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Jan 1, 1960·Cold Spring Harbor Symposia on Quantitative Biology·J ASCHOFF
Jan 1, 1960·Cold Spring Harbor Symposia on Quantitative Biology·C S PITTENDRIGH

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Nov 1, 1982·Physiology & Behavior·S M Sykes, W W Henton
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Jun 26, 2013·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Hester C van DiepenJohanna H Meijer

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