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| Titel: |
Difference between the effects of steady illumination vs. darkness on circadian changes in the processing of visual information in rabbits |
| Auteur: |
Bobbert, A. C. van Wiechen, R. J. M. P. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 14 (1983) nr. 2 pagina's 101-110 |
| Jaar: |
1983-06 |
| Inhoud: |
Eight rabbits were synchronized by LD 14:10 (200-250: 0 Lux). After more than 4 weeks of exposure to this Zeitgeber two types of experiment were performed on each specimen. In type I experiments the electroretinograms (ERG's) and Visually Evoked Potentials in response to 3 μsec flashes were recorded during the “day-time-potential” phase of the circadian rhythm, at first during steady illumination at either 1200 or 2500 Lux and thereupon in darkness, and also during the “night-time-potential” phase, but then firstly in darkness and afterwards during illumination with the same intensity. In type II experiments the responses to the same flashes were, again, recorded in both phases but now the sequence of illumination - at identical level -and darkness was reversed. It appeared that programmed changes in photic responses occurred both in darkness (in type I experiments) and during steady illumination (in experiments of the other type) but that the circadian change in amplitude of the ERG b waves was larger for the ERG's recorded in darkness than for those obtained during illumination. It further appeared that the suppressive influence exerted by background illumination on the ERG's is stronger during the N.T.P.-phase of the rhythm than in the other phase. The possible roles of this circadian rhythm in retinal photosensitivity for the daily survival of rabbits, and in the origin of photoperiodic changes, are discussed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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