ISSN:
1432-1351
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary 1. We investigated whether changes in the spectral composition of a light regimen can synchronize the periodicity of locomotor activity in wild rabbits. We used light regimens that involved changes in both intensity and colour. 2. We conclude that blue intensity increments are more effective in advancing the start of activity than blue decrements, whereas yellow decrements are more effective than yellow increments. 3. Our results are in accordance with electrophysiological and psychophysical data which show that in the blue-green sensitive antagonistic visual system of the rabbit retina, excitation originates from the blue sensitive system, whereas the off-effects originate from the green sensitive system. 4. Our results are compatible with an oscillator that controls the start of locomotor activity and an oscillator that controls the end of this activity; the first oscillator will be synchronized by impulses from the photopic (cone) visual system, the second by impulses that originate during the transition from photopic to scotopic (rod) vision and vice versa. 5. We suggest that both colour changes and light intensity changes in the natural light regimen are synchronizers of circadian activity.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00623911
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