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A device for simulating twilight in studies of animal activity

1977; Springer Science+Business Media; Volume: 9; Issue: 4 Linguagem: Inglês

10.3758/bf03202275

1554-3528

Terry E. Graham, Victor H. Hutchison,

Circadian rhythm and melatonin

A dimmer-timer device for producing gradual on-off and off-on lighting transitions (twilight simulation) is described.The basic circuitry is a 24-h timer wired to activate a cam-driven potentiometer at preset times to produce artificial twilight transitions.Kavanau (1962aKavanau ( , b, 1969) ) suggested that laboratory studies of animal activity and rhythmicity should employ artificial twilight.He discovered that sudden on-off lighting elicited erratic wheel running behavior in weasels, chipmunks, and white-footed mice.